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WPO201900051 Calculations 2021-07-08
Scottsville Elementary School Addition ALBEMARLE COUNTY, VIRGINIA SCOTTSVILLE DISTRICT DESIGN CALCULATIONS & NARRATIVE WPO 201900051 SEPTEMBER 99 2019 REVISED DECEMBER 20, 2019 REVISED F'EBRUARY 13, 2020 REVISED APRIL 6, 2020 VSMP/WPO AMENDMENT JUNE 29 2021 000�• • TIMMONS GROUP YOUR VISION ACHIEVED THROUGH OURS. Prepared by: Jonathan Showalter, PE Timmons Group 608 Preston Avenue, Suite 200 Charlottesville, VA 22903 434.327.1681 :LALTH0 GAP N1II,1S \i. SHOMLTER Y Lu. No. 0402057151 'gyp OG/02/202I l.rs'ONA L ��� Table of Contents Section Title Project Narrative 2.1 LD-204 Inlet Calculations 2.2 LD-229 Pipe Calculations 2.3 LD-347 Hydraulic Grade Line Analysis Pre and Post Developed HydroCAD Calculations 4 Virginia Runoff Reduction Method Worksheet Summary Project Narrative: This project includes an addition to Scottsville Elementary as well as added site parking, a relocated fire lane, an added bus loop and associated site work. The limits of disturbance is 3.04 acres. Water Ouality The current site contains a school building, modular classrooms, storage sheds, and associated parking lots and roadways. 3.04 acres of disturbed area was analyzed for water quality. The site will require 1.81 lb./year to be treated. The project proposes one Level 1 bioretention facility removing 0.64 lb./year and one Level 2 bioretention facility removing 1.38 lb./year, totaling 2.02 lb./year. A surplus reduction of 0.21 lb./year will be available to be used on future projects owned by the Albemarle County School board, per 9VAC25-870-69 Section A Part 5. Water Quantity The site drains to an existing dry pond on the north side of the site. Two Bioretention facilities will be added upstream of pond to provide stormwater quality and some stormwater quantity control. The existing dry pond will be expanded to accommodate detain additional runoff from the proposed project in order to meet channel and flood protection requirements. See calculations on plan sheet C6.0 and routing calculations included in this Calculations Book. LD-229 STORM SEWER DESIGN COMPUTATIONS STORM FREQUENCY 10 PROJECT: Scottsville Elementary School Addition LOCATION: Booneville, VA COUNTY: Bremo Blue Pwr NOAA STATION: Designed by: A. Mabee Checked by: J. Showalter UNITS ENGLISH PWE NO, FROMFOM TO POIMP DRALY, AREA "A' Acre (3 RUNOFF COEFF. "C" (0 CA TOTAL INLET TrME M1Gnures RAW FALL NMr 8 RUNOFF INVERT ELEVATIONS LENGTH ofRlp FL 12 SLOPE FlI . 13 SIZE (Dia.Or Spao/Riee) la 16 SHAPE Numb ofn,- Caps ,, CFS IS Ricdon Slope P/R. NORMAL FLOW FLOW TRAE Sec. 19) REMARKS 18 INCRE-ACCUM- MENT (5 ULATED 6 Ue¢ CFS TowQ CFS (9 UPPER END (10 LOWER END 11 Depl6al FI-.& R. A aar F-w SqR Ron Ft Vn Fd ec (16 Pn Ft REFERENCE 1 STA. REFERENCE 2 STA. IBI 102 100 0.28 069 0.19 1.11 508 6.17 &W 731 NL00 390,N 25.36 003001 IB Ci . 1 18.20 0.005110 066 075 0.35 9.73 2,13 261 103 IN 102 1.11 083 a%! 092 501 620 000 5]I 396.32 39301 55.06 006W1 IB Ci . 1 M.73 000310 008 009 0.27 11.71 261 070 201 202 200 0.01 am 001 501 OW 000 601 39238 390.27 60.22 0034W IS Ci . 1 12.08 000910 063 0.61 0.31 9.85 2,13 6,12 301 BLDG 300 0.38 090 0.30 036 501 620 000 2.12 W9,% 3WAI 48.95 000513 IS Ci . 1 4A3 000110 059 0.57 0.30 3.69 0,81 13.27 001 002 000 0.17 061 0.10 073 10A3 6% 000 361 31,17 3W.M WW2 0 9(0 IS Ci . 1 1<.30 000330 003 037 0.26 9.73 190 823 A03 4DM1 A02 0.01 O.W 062 10O.05 501 0.00 312 AS 39.28 0.01" IS C- 1 66 0002G(I 061 060 0.31 5.2 IN M." 1.36 00] au 062 W0 00A05 312 935 395.58 1617 0.0120 15 CWm 11 1 1 Z08 1=1 058 1 056 0.30 559 107 250 601 602 6W 0.07 003 0.03 0.26 553 601 000 157 Y ,68 4@.50 1]3] 10.010021 12 1 Ci Wm I 1 1 357 1 0002110 1 006 1 o% 0.26 6.39 076 OW 603 60M1 602 0.08 090 am 023 SMI 662 000 131 40309 4@37 3138 1 0.01001 1 12 1 Ci Wm I 1 1 357 1 &WIM 1 002 1 031 0.22 6.19 069 7,59 (05 605 606 0.29 1 056 1 0.16 0,16 501 620 000 09] I 4N,,10 1 403.61 98.62 10.010001 8 1 Ci . I 1 1 1.31 1 &005801 003 1 026 1 0.19 1 6.11 069 239C FORM LC � SHEET 1 OF RBOJECT Scn115vIIle ElemenWq&C lAU Ww DESGNEB: A. Ma DATE 5i2C11021 CHEWED: UNTS ENGUSH INLETSOFT BY ENSOFTEC DATE: 5QC l LP347 PROJECT: Scottsville Elementary School Addition DESIGNED BY: A. Mabee HYDRAULIC GRADE LINE ANALYSIS Checked: J. Showalter 10 Year IMET OR JUNCTION STA. INVERT EL. OUTFLOW PIPE DEPTH OFFLOW OWFLOW PIPE OUTLET WATER SURFACE EIEV. DIA PIPE Do INmm DESIGN DISCH, Go CF=MS IENGTH PIPE Lo FIRA FRICTION SLOPE, Ski (FThT) MM1 FRICTION LOSS HI " JUNCTON LOW SURFACE FLOW Adj. Ht 1S W FVM Intel Drop'? YM OS W FM(FM) FINAL H Inkl wowTop Surtace Ekyron Top o1 MH d lnIO Elev. APPROX. AdpxAo ? Vo Cmtr. Ho FNA V. N'Wg Hi (Ex 0.35'MA%. SKEW AWW K Berg H FNA Sum HL FVM 1 2 3 d 5 6 8 9 10 11 12 13 16 15 16 16 17 18 19 100 391.280 102 390.240 1.50 391."0 18 6.897 25.36 0.00451 0.114 12.339 0.591 11.707 2.128 0.745 0.0 0.00 0.000 1.336 1.185 1.336 YES 0.668 0.782 392.292 398.370 O.K. 104 393.012 1.50 394.212 18 5.712 55.06 0.00309 0.170 11.]0] 0.532 0.000 0.000 0.000 0.0 0.00 0.000 0.532 0.000 0.532 YES 0.266 0.436 396.796 400.933 O.K. 200 391.280 202 390.245 1.25 391.280 15 6.040 61.01 0.00914 0.558 12.]2] 0.629 0.000 0.000 0.000 0.0 0.00 0.000 0.629 0.000 0.629 YES 0.314 0.872 395.028 399.405 O.K. 300 399.950 BLDG 399.112 1.25 400.112 15 2.119 48.95 0.00112 0.055 3.656 0.052 0.000 0.000 0.000 0.0 0.00 0.000 0.052 0.000 0.052 YES 0.026 0.081 400.193 403.310 O.K. 400 391.310 402 390.245 1.25 391.310 15 4.491 80.12 0.00505 0.405 10.314 0.413 5.497 OA69 0.164 0.0 0.00 0.000 0.5T 0.632 0.5]] NO 0.5]] 0.982 394.652 402.012 O.K. 606 394.280 1.25 395.280 15 3.859 120.03 0.00373 0."8 5.497 0.117 5.486 OA67 0.164 0.0 0.00 0.000 0.281 0.000 0.281 YES 0.140 0.588 396.176 402.653 O.K. 406 395.585 1.25 396.585 15 3.859 14.17 0.00373 0.053 5.4" 0.117 0.000 0.000 0.000 0.0 0.00 0.000 0.117 3.859 0.152 YES 0.076 0.129 396.714 400.670 O.K. 14S BioretenI 2 Area 11 S 1 S Bioretention 1 Area Pre S Facility 15 _ _ _ Drain12 a eArea 16 Biore nUonli Pontling Bioretention 2 ontling Bioretenti n 2 Media I 2P 17S 13 EX S Facility $$ Remaining Post Bioretention 1 Media Facility Drainage Area Pre Unroutetl Ar 18 4L Modified Syvm Facility Pre Analysis Point 1 Ib 19S 20L P..t Unroutetl Area Post Analysis Point 1 Subcat Reach 4on Llnk Storm Calcs-update 5-21-2021 Prepared by Timmons Group Rainfall Events Listing (selected events) Event# Event Storm Type Curve Mode Duration B/B Depth AMC Name (hours) (inches) 1 1 YR Type II 24-hr Default 24.00 1 2.87 2 2 10 YR Type II 24-hr Default 24.00 1 5.25 2 3 100 YR Type II 24-hr Default 24.00 1 8.62 2 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 4.280 74 >75% Grass cover, Good, HSG C (1S, 3S, 11S, 14S, 17S, 19S) 4.050 98 Paved parking, HSG C (1S, 11S, 14S, 17S, 19S) 0.100 66 Woods, Poor, HSG B (1S) 0.070 77 Woods, Poor, HSG C (11S, 14S) 8.500 85 TOTAL AREA Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 0.100 HSG B 1S 8.400 HSG C 1S, 3S, 11S, 14S, 17S, 19S 0.000 HSG D 0.000 Other 8.500 TOTAL AREA Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Ground Covers (all nodes) Printed 5/28/2021 HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 0.000 4.280 0.000 0.000 4.280 >75% Grass cover, Good 1S, 3S, 11S, 14S, 17S, 19S 0.000 0.000 4.050 0.000 0.000 4.050 Paved parking 1S, 11S, 14S, 17S, 19S 0.000 0.100 0.070 0.000 0.000 0.170 Woods, Poor 1S, 11S, 14S 0.000 0.100 8.400 0.000 0.000 8.500 TOTAL AREA Storm Calcs-update 5-21-2021 Prepared by Timmons Group Pipe Listing (all nodes) Printed 5/28/2021 Line# Node In -Invert Out -Invert Length Slope n Diam/Width Height Inside -Fill Number (feet) (feet) (feet) (ft/ft) (inches) (inches) (inches) 1 17S 0.00 0.00 200.0 0.0200 0.010 15.0 0.0 0.0 2 19S 0.00 0.00 200.0 0.0200 0.010 15.0 0.0 0.0 3 2P 390.05 389.69 53.0 0.0068 0.011 24.0 0.0 0.0 4 2P 390.38 390.05 8.0 0.0412 0.011 12.0 0.0 0.0 5 18P 390.19 389.65 52.0 0.0104 0.011 24.0 0.0 0.0 Storm Calcs-update 5-21-2021 Type 11 24-hr 1 YR Rainfall=2.87" Prepared by Timmons Group Printed 5/28/2021 HydroCAD® 10.10-4a s/n 08663 © 2020 HydroCAD Software Solutions LLC Page 7 Time span=0.00-20.00 hrs, dt=0.01 hrs, 2001 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment1S: Pre SWM Facility Runoff Area=4.150 ac 38.07% Impervious Runoff Depth>1.23" Flow Length=375' Tc=19.7 min CN=83 Runoff=6.22 cfs 0.424 of Subcatchment3S: Pre Unrouted Area Runoff Area=0.100 ac 0.00% Impervious Runoff Depth>0.74" Flow Length=375' Tc=19.7 min CN=74 Runoff=0.09 cfs 0.006 of Subcatchment11S:BioretentionlArea Runoff Area=1.290ac 31.01%Impervious Runoff Depth>1.11" Tc=5.0 min CN=81 Runoff=2.92 cfs 0.119 of Subcatchment14S: Bioretention2 Area Runoff Area=0.880 ac 76.14% Impervious Runoff Depth>1.91" Tc=5.0 min CN=92 Runoff=3.17 cfs 0.140 of Subcatchment17S: Remaining Post SWM Runoff Area=1.980 ac 67.17% Impervious Runoff Depth>1.73" Flow Length=400' Tc=17.6 min CN=90 Runoff=4.38 cfs 0.286 of Subcatchment19S: Post Unrouted Area Runoff Area=0.100 ac 70.00% Impervious Runoff Depth>1.81" Flow Length=400' Tc=17.6 min CN=91 Runoff=0.23 cfs 0.015 of Pond 2P: EX SWM Facility Peak EIev=392.08' Storage=3,132 cf Inflow=6.22 cfs 0.424 of Outflow=4.14 cfs 0.422 of Pond 12P: Bioretention1l Ponding Peak EIev=401.15' Storage=1,057 cf Inflow=2.92 cfs 0.119 of Primary=2.61 cfs 0.047 of Secondary=0.12 cfs 0.072 of Outflow=2.72 cfs 0.119 of Pond 13P: Bioretention1l Media Peak EIev=396.18' Storage=4 cf Inflow=0.12 cfs 0.072 of Outflow=0.12 cfs 0.072 of Pond 15P: Bioretention2 Ponding Peak EIev=399.79' Storage=1,473 cf Inflow=3.17 cfs 0.140 of Primary=2.41 cfs 0.044 of Secondary=0.20 cfs 0.096 of Outflow=2.60 cfs 0.140 of Pond 16P: Bioretention2 Media Peak EIev=395.41' Storage=995 cf Inflow=0.20 cfs 0.096 of Outflow=0.19 cfs 0.074 of Pond 18P: Modified SWM Facility Peak EIev=392.51' Storage=7,006 cf Inflow=8.71 cfs 0.523 of Outflow=2.37 cfs 0.514 of Link 4L: Pre Analysis Point 1 Inflow=4.20 cfs 0.428 of Primary=4.20 cfs 0.428 of Link 20L: Post Analysis Point 1 Inflow=2.45 cfs 0.529 of Primary=2.45 cfs 0.529 of Total Runoff Area = 8.500 ac Runoff Volume = 0.990 of Average Runoff Depth = 1.40" 52.35% Pervious = 4.450 ac 47.65% Impervious = 4.050 ac Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Printed 5/28/2021 Summary for Subcatchment 1S: Pre SWM Facility Drainage Area Runoff = 6.22 cfs @ 12.13 hrs, Volume= 0.424 af, Depth> 1.23" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Type II 24-hr 1 YR Rainfall=2.87" Area (ac) CN Description 1.580 98 Paved parking, HSG C 2.470 74 >75% Grass cover, Good, HSG C 0.100 66 Woods, Poor, HSG B 4.150 83 Weighted Average 2.570 61.93% Pervious Area 1.580 38.07% Impervious Area Tc Length Slope Velocity Capacity Description 17.3 200 0.0450 0.19 Sheet Flow, Grass: Dense n= 0.240 P2= 3.47" 2.4 175 0.0300 1.21 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 19.7 375 Total Subcatchment 1S: Pre SWM Facility Drainage Area Hydrograph ❑ Runoff Type II 24-hr 1 YR Rainfall=2.87" Runoff Area=4.150 ac Runoff Volume=0.424 of 4I I Runoff Depth>1.23" LL 311 Flow Length=375' i I Tc=19.7 min CN=83 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Printed 5/28/2021 Hydrograph for Subcatchment 1S: Pre SWM Facility Drainage Area Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.20 0.01 0.00 0.00 0.40 0.01 0.00 0.00 0.60 0.02 0.00 0.00 0.80 0.02 0.00 0.00 1.00 0.03 0.00 0.00 1.20 0.04 0.00 0.00 1.40 0.04 0.00 0.00 1.60 0.05 0.00 0.00 1.80 0.06 0.00 0.00 2.00 0.06 0.00 0.00 2.20 0.07 0.00 0.00 2.40 0.08 0.00 0.00 2.60 0.08 0.00 0.00 2.80 0.09 0.00 0.00 3.00 0.10 0.00 0.00 3.20 0.11 0.00 0.00 3.40 0.11 0.00 0.00 3.60 0.12 0.00 0.00 3.80 0.13 0.00 0.00 4.00 0.14 0.00 0.00 4.20 0.15 0.00 0.00 4.40 0.15 0.00 0.00 4.60 0.16 0.00 0.00 4.80 0.17 0.00 0.00 5.00 0.18 0.00 0.00 5.20 0.19 0.00 0.00 5.40 0.20 0.00 0.00 5.60 0.21 0.00 0.00 5.80 0.22 0.00 0.00 6.00 0.23 0.00 0.00 6.20 0.24 0.00 0.00 6.40 0.25 0.00 0.00 6.60 0.26 0.00 0.00 6.80 0.27 0.00 0.00 7.00 0.28 0.00 0.00 7.20 0.30 0.00 0.00 7.40 0.31 0.00 0.00 7.60 0.32 0.00 0.00 7.80 0.33 0.00 0.00 8.00 0.34 0.00 0.00 8.20 0.36 0.00 0.00 8.40 0.37 0.00 0.00 8.60 0.39 0.00 0.00 8.80 0.40 0.00 0.00 9.00 0.42 0.00 0.00 9.20 0.44 0.00 0.00 9.40 0.46 0.00 0.01 9.60 0.48 0.00 0.01 9.80 0.50 0.00 0.02 10.00 0.52 0.01 0.03 10.20 0.54 0.01 0.04 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 10.40 0.57 0.01 0.06 10.60 0.60 0.02 0.07 10.80 0.64 0.02 0.10 11.00 0.67 0.03 0.13 11.20 0.72 0.04 0.17 11.40 0.78 0.06 0.23 11.60 0.88 0.09 0.33 11.80 1.24 0.24 0.97 12.00 1.90 0.63 4.09 12.20 2.01 0.70 5.52 12.40 2.08 0.75 2.41 12.60 2.13 0.79 1.32 12.80 2.18 0.82 0.87 13.00 2.22 0.85 0.67 13.20 2.25 0.87 0.58 13.40 2.28 0.89 0.51 13.60 2.31 0.91 0.46 13.80 2.33 0.93 0.42 14.00 2.35 0.95 0.38 14.20 2.37 0.96 0.35 14.40 2.39 0.98 0.32 14.60 2.41 0.99 0.31 14.80 2.43 1.00 0.30 15.00 2.45 1.02 0.29 15.20 2.47 1.03 0.28 15.40 2.48 1.04 0.26 15.60 2.50 1.05 0.25 15.80 2.51 1.06 0.24 16.00 2.53 1.08 0.23 16.20 2.54 1.09 0.22 16.40 2.55 1.09 0.21 16.60 2.56 1.10 0.20 16.80 2.58 1.11 0.20 17.00 2.59 1.12 0.19 17.20 2.60 1.13 0.19 17.40 2.61 1.14 0.19 17.60 2.62 1.15 0.18 17.80 2.63 1.16 0.18 18.00 2.64 1.17 0.17 18.20 2.65 1.17 0.17 18.40 2.66 1.18 0.16 18.60 2.67 1.19 0.16 18.80 2.68 1.20 0.16 19.00 2.69 1.20 0.15 19.20 2.70 1.21 0.15 19.40 2.71 1.22 0.14 19.60 2.72 1.22 0.14 19.80 2.72 1.23 0.13 20.00 2.73 1.23 0.13 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Summary for Subcatchment 3S: Pre Unrouted Area Runoff = 0.09 cfs @ 12.14 hrs, Volume= 0.006 af, Depth> 0.74" Printed 5/28/2021 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Type II 24-hr 1 YR Rainfall=2.87" Area (ac) CN Description 0.000 98 Paved parking, HSG C 0.100 74 >75% Grass cover, Good, HSG C 0.100 74 Weighted Average 0.100 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.3 200 0.0450 0.19 Sheet Flow, Grass: Dense n= 0.240 P2= 3.47" 2.4 175 0.0300 1.21 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 19.7 375 Total Subcatchment 3S: Pre Unrouted Area Hydrograph o.000 ---J--J---- a.as I I I I I U o.oa5 Type 1124-hf - -1- - J, a.aa I___J__J___ 1 YR Rainfall=2.87"_ 0.075 --L--,--- Runoff Area=0.100 0.065 ac --�__-- 006 Runoff Volume=0,0Q6 of-'', w Oo 5 5 = s.o Runoff Depth>0.74`r!===��� _p ° 045 Flow Length=375........ LL 0.04 0.035 9. Tc=17 min 1 I I 1 I °.03 1 CN=74 ---; ------I, --I,------- 0.025 _ ----------------------- 0.02 1 0.015 1 1 1 ---- -------II--J---1---r-----I --I --0.01 s 10 11 Time (hours) ___ _ ___i__J___ ■Runoff I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I -J---'---'-----'---'--J--- I I I I I I I I -----J--JI ------ I --JI- I -- I I I I I I --Ir--}--- - - -I --' I -- I' --- � I - I I I I I I I I I Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Hydrograph for Subcatchment 3S: Pre Unrouted Area Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.20 0.01 0.00 0.00 0.40 0.01 0.00 0.00 0.60 0.02 0.00 0.00 0.80 0.02 0.00 0.00 1.00 0.03 0.00 0.00 1.20 0.04 0.00 0.00 1.40 0.04 0.00 0.00 1.60 0.05 0.00 0.00 1.80 0.06 0.00 0.00 2.00 0.06 0.00 0.00 2.20 0.07 0.00 0.00 2.40 0.08 0.00 0.00 2.60 0.08 0.00 0.00 2.80 0.09 0.00 0.00 3.00 0.10 0.00 0.00 3.20 0.11 0.00 0.00 3.40 0.11 0.00 0.00 3.60 0.12 0.00 0.00 3.80 0.13 0.00 0.00 4.00 0.14 0.00 0.00 4.20 0.15 0.00 0.00 4.40 0.15 0.00 0.00 4.60 0.16 0.00 0.00 4.80 0.17 0.00 0.00 5.00 0.18 0.00 0.00 5.20 0.19 0.00 0.00 5.40 0.20 0.00 0.00 5.60 0.21 0.00 0.00 5.80 0.22 0.00 0.00 6.00 0.23 0.00 0.00 6.20 0.24 0.00 0.00 6.40 0.25 0.00 0.00 6.60 0.26 0.00 0.00 6.80 0.27 0.00 0.00 7.00 0.28 0.00 0.00 7.20 0.30 0.00 0.00 7.40 0.31 0.00 0.00 7.60 0.32 0.00 0.00 7.80 0.33 0.00 0.00 8.00 0.34 0.00 0.00 8.20 0.36 0.00 0.00 8.40 0.37 0.00 0.00 8.60 0.39 0.00 0.00 8.80 0.40 0.00 0.00 9.00 0.42 0.00 0.00 9.20 0.44 0.00 0.00 9.40 0.46 0.00 0.00 9.60 0.48 0.00 0.00 9.80 0.50 0.00 0.00 10.00 0.52 0.00 0.00 10.20 0.54 0.00 0.00 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 10.40 0.57 0.00 0.00 10.60 0.60 0.00 0.00 10.80 0.64 0.00 0.00 11.00 0.67 0.00 0.00 11.20 0.72 0.00 0.00 11.40 0.78 0.00 0.00 11.60 0.88 0.01 0.00 11.80 1.24 0.07 0.01 12.00 1.90 0.31 0.05 12.20 2.01 0.35 0.08 12.40 2.08 0.39 0.04 12.60 2.13 0.41 0.02 12.80 2.18 0.44 0.01 13.00 2.22 0.46 0.01 13.20 2.25 0.47 0.01 13.40 2.28 0.49 0.01 13.60 2.31 0.50 0.01 13.80 2.33 0.52 0.01 14.00 2.35 0.53 0.01 14.20 2.37 0.54 0.01 14.40 2.39 0.55 0.01 14.60 2.41 0.56 0.01 14.80 2.43 0.57 0.01 15.00 2.45 0.58 0.01 15.20 2.47 0.59 0.00 15.40 2.48 0.60 0.00 15.60 2.50 0.61 0.00 15.80 2.51 0.62 0.00 16.00 2.53 0.62 0.00 16.20 2.54 0.63 0.00 16.40 2.55 0.64 0.00 16.60 2.56 0.64 0.00 16.80 2.58 0.65 0.00 17.00 2.59 0.66 0.00 17.20 2.60 0.67 0.00 17.40 2.61 0.67 0.00 17.60 2.62 0.68 0.00 17.80 2.63 0.68 0.00 18.00 2.64 0.69 0.00 18.20 2.65 0.70 0.00 18.40 2.66 0.70 0.00 18.60 2.67 0.71 0.00 18.80 2.68 0.71 0.00 19.00 2.69 0.72 0.00 19.20 2.70 0.72 0.00 19.40 2.71 0.73 0.00 19.60 2.72 0.73 0.00 19.80 2.72 0.74 0.00 20.00 2.73 0.74 0.00 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Printed 5/28/2021 Summary for Subcatchment 11S: Bioretention 1 Area Runoff = 2.92 cfs @ 11.96 hrs, Volume= 0.119 af, Depth> 1.11" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Type II 24-hr 1 YR Rainfall=2.87" Area (ac) CN Description 0.400 98 Paved parking, HSG C 0.870 74 >75% Grass cover, Good, HSG C 0.020 77 Woods, Poor, HSG C 1.290 81 Weighted Average 0.890 68.99% Pervious Area 0.400 31.01% Impervious Area Tc Length Capacity Description t-f..x 5.0 Direct Entry, Subcatchment 11S: Bioretention 1 Area Hydrograph ❑ Runoff 3 Type II 24-hr 1 YR Rainfall=2.87" Runoff Area=1.290 ac 2 Runoff Volume=0.119 of Runoff Depth>1.11" Tc=5.0 min C N=81 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Caics-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Hydrograph for Subcatchment 11S: Bioretention 1 Area Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.20 0.01 0.00 0.00 0.40 0.01 0.00 0.00 0.60 0.02 0.00 0.00 0.80 0.02 0.00 0.00 1.00 0.03 0.00 0.00 1.20 0.04 0.00 0.00 1.40 0.04 0.00 0.00 1.60 0.05 0.00 0.00 1.80 0.06 0.00 0.00 2.00 0.06 0.00 0.00 2.20 0.07 0.00 0.00 2.40 0.08 0.00 0.00 2.60 0.08 0.00 0.00 2.80 0.09 0.00 0.00 3.00 0.10 0.00 0.00 3.20 0.11 0.00 0.00 3.40 0.11 0.00 0.00 3.60 0.12 0.00 0.00 3.80 0.13 0.00 0.00 4.00 0.14 0.00 0.00 4.20 0.15 0.00 0.00 4.40 0.15 0.00 0.00 4.60 0.16 0.00 0.00 4.80 0.17 0.00 0.00 5.00 0.18 0.00 0.00 5.20 0.19 0.00 0.00 5.40 0.20 0.00 0.00 5.60 0.21 0.00 0.00 5.80 0.22 0.00 0.00 6.00 0.23 0.00 0.00 6.20 0.24 0.00 0.00 6.40 0.25 0.00 0.00 6.60 0.26 0.00 0.00 6.80 0.27 0.00 0.00 7.00 0.28 0.00 0.00 7.20 0.30 0.00 0.00 7.40 0.31 0.00 0.00 7.60 0.32 0.00 0.00 7.80 0.33 0.00 0.00 8.00 0.34 0.00 0.00 8.20 0.36 0.00 0.00 8.40 0.37 0.00 0.00 8.60 0.39 0.00 0.00 8.80 0.40 0.00 0.00 9.00 0.42 0.00 0.00 9.20 0.44 0.00 0.00 9.40 0.46 0.00 0.00 9.60 0.48 0.00 0.00 9.80 0.50 0.00 0.00 10.00 0.52 0.00 0.01 10.20 0.54 0.00 0.01 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 10.40 0.57 0.00 0.01 10.60 0.60 0.01 0.02 10.80 0.64 0.01 0.03 11.00 0.67 0.02 0.04 11.20 0.72 0.02 0.05 11.40 0.78 0.04 0.08 11.60 0.88 0.06 0.18 11.80 1.24 0.19 0.90 12.00 1.90 0.54 2.55 12.20 2.01 0.61 0.41 12.40 2.08 0.66 0.31 12.60 2.13 0.69 0.21 12.80 2.18 0.72 0.19 13.00 2.22 0.75 0.16 13.20 2.25 0.77 0.14 13.40 2.28 0.79 0.13 13.60 2.31 0.81 0.12 13.80 2.33 0.82 0.11 14.00 2.35 0.84 0.10 14.20 2.37 0.85 0.09 14.40 2.39 0.87 0.09 14.60 2.41 0.88 0.09 14.80 2.43 0.89 0.08 15.00 2.45 0.91 0.08 15.20 2.47 0.92 0.08 15.40 2.48 0.93 0.07 15.60 2.50 0.94 0.07 15.80 2.51 0.95 0.07 16.00 2.53 0.96 0.06 16.20 2.54 0.97 0.06 16.40 2.55 0.98 0.06 16.60 2.56 0.99 0.06 16.80 2.58 1.00 0.06 17.00 2.59 1.01 0.06 17.20 2.60 1.01 0.05 17.40 2.61 1.02 0.05 17.60 2.62 1.03 0.05 17.80 2.63 1.04 0.05 18.00 2.64 1.05 0.05 18.20 2.65 1.05 0.05 18.40 2.66 1.06 0.05 18.60 2.67 1.07 0.05 18.80 2.68 1.07 0.04 19.00 2.69 1.08 0.04 19.20 2.70 1.09 0.04 19.40 2.71 1.09 0.04 19.60 2.72 1.10 0.04 19.80 2.72 1.11 0.04 20.00 2.73 1.11 0.04 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Printed 5/28/2021 Summary for Subcatchment 14S: Bioretention 2 Area Runoff = 3.17 cfs @ 11.96 hrs, Volume= 0.140 af, Depth> 1.91" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Type II 24-hr 1 YR Rainfall=2.87" Area (ac) CN Description 0.670 98 Paved parking, HSG C 0.160 74 >75% Grass cover, Good, HSG C 0.050 77 Woods, Poor, HSG C 0.880 92 Weighted Average 0.210 23.86% Pervious Area 0.670 76.14% Impervious Area Tc Length Capacity Description 5.0 Direct Entry, Subcatchment 14S: Bioretention 2 Area Hydrograph ■ Runoff 3 Type II 24-hr 1 YR Rainfall=2.87" Runoff Area=0.880 ac Runoff Volume=0.140 of 2 Runoff Depth>1.91" Tc=5.0 min CN=92 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Caics-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Hydrograph for Subcatchment 14S: Bioretention 2 Area Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.20 0.01 0.00 0.00 0.40 0.01 0.00 0.00 0.60 0.02 0.00 0.00 0.80 0.02 0.00 0.00 1.00 0.03 0.00 0.00 1.20 0.04 0.00 0.00 1.40 0.04 0.00 0.00 1.60 0.05 0.00 0.00 1.80 0.06 0.00 0.00 2.00 0.06 0.00 0.00 2.20 0.07 0.00 0.00 2.40 0.08 0.00 0.00 2.60 0.08 0.00 0.00 2.80 0.09 0.00 0.00 3.00 0.10 0.00 0.00 3.20 0.11 0.00 0.00 3.40 0.11 0.00 0.00 3.60 0.12 0.00 0.00 3.80 0.13 0.00 0.00 4.00 0.14 0.00 0.00 4.20 0.15 0.00 0.00 4.40 0.15 0.00 0.00 4.60 0.16 0.00 0.00 4.80 0.17 0.00 0.00 5.00 0.18 0.00 0.00 5.20 0.19 0.00 0.00 5.40 0.20 0.00 0.00 5.60 0.21 0.00 0.00 5.80 0.22 0.00 0.00 6.00 0.23 0.00 0.00 6.20 0.24 0.00 0.01 6.40 0.25 0.01 0.01 6.60 0.26 0.01 0.01 6.80 0.27 0.01 0.01 7.00 0.28 0.01 0.01 7.20 0.30 0.01 0.01 7.40 0.31 0.02 0.01 7.60 0.32 0.02 0.01 7.80 0.33 0.02 0.02 8.00 0.34 0.03 0.02 8.20 0.36 0.03 0.02 8.40 0.37 0.04 0.02 8.60 0.39 0.04 0.02 8.80 0.40 0.05 0.03 9.00 0.42 0.06 0.03 9.20 0.44 0.06 0.03 9.40 0.46 0.07 0.03 9.60 0.48 0.08 0.04 9.80 0.50 0.09 0.04 10.00 0.52 0.10 0.05 10.20 0.54 0.11 0.05 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 10.40 0.57 0.12 0.06 10.60 0.60 0.14 0.07 10.80 0.64 0.16 0.09 11.00 0.67 0.18 0.10 11.20 0.72 0.21 0.13 11.40 0.78 0.25 0.17 11.60 0.88 0.32 0.33 11.80 1.24 0.58 1.27 12.00 1.90 1.15 2.66 12.20 2.01 1.24 0.40 12.40 2.08 1.31 0.29 12.60 2.13 1.36 0.20 12.80 2.18 1.40 0.17 13.00 2.22 1.43 0.15 13.20 2.25 1.46 0.13 13.40 2.28 1.49 0.12 13.60 2.31 1.51 0.11 13.80 2.33 1.54 0.10 14.00 2.35 1.56 0.09 14.20 2.37 1.58 0.08 14.40 2.39 1.60 0.08 14.60 2.41 1.61 0.08 14.80 2.43 1.63 0.08 15.00 2.45 1.65 0.07 15.20 2.47 1.66 0.07 15.40 2.48 1.68 0.07 15.60 2.50 1.69 0.06 15.80 2.51 1.70 0.06 16.00 2.53 1.72 0.06 16.20 2.54 1.73 0.05 16.40 2.55 1.74 0.05 16.60 2.56 1.75 0.05 16.80 2.58 1.76 0.05 17.00 2.59 1.77 0.05 17.20 2.60 1.79 0.05 17.40 2.61 1.80 0.05 17.60 2.62 1.81 0.05 17.80 2.63 1.82 0.04 18.00 2.64 1.83 0.04 18.20 2.65 1.84 0.04 18.40 2.66 1.84 0.04 18.60 2.67 1.85 0.04 18.80 2.68 1.86 0.04 19.00 2.69 1.87 0.04 19.20 2.70 1.88 0.04 19.40 2.71 1.89 0.03 19.60 2.72 1.89 0.03 19.80 2.72 1.90 0.03 20.00 2.73 1.91 0.03 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Printed 5/28/2021 Summary for Subcatchment 17S: Remaining Post SWM Facility Drainage Area Runoff = 4.38 cfs @ 12.10 hrs, Volume= 0.286 af, Depth> 1.73" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Type II 24-hr 1 YR Rainfall=2.87" Area (ac) CN Description 1.330 98 Paved parking, HSG C 0.650 74 >75% Grass cover, Good, HSG C 0.000 66 Woods, Poor, HSG B 1.980 90 Weighted Average 0.650 32.83% Pervious Area 1.330 67.17% Impervious Area Tc Length Slope Velocity Capacity Description 17.3 200 0.0450 0.19 Sheet Flow, Grass: Dense n= 0.240 P2= 3.47" 0.3 200 0.0200 9.68 11.88 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.010 PVC, smooth interior 17.6 400 Total Subcatchment 17S: Remaining Post SWM Facility Drainage Area Hydrograph ❑ Runoff Type 11 24-hr 4 1 YR Rainfall=2.87" Runoff Area=1.980 ac 3 Runoff Volume=0.286 of Runoff Depth>1.73" 2 Flow Length=400' Tc=17.6 min CN=90 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Caics-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Printed 5/28/2021 Hydrograph for Subcatchment 17S: Remaining Post SWM Facility Drainage Area Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.20 0.01 0.00 0.00 0.40 0.01 0.00 0.00 0.60 0.02 0.00 0.00 0.80 0.02 0.00 0.00 1.00 0.03 0.00 0.00 1.20 0.04 0.00 0.00 1.40 0.04 0.00 0.00 1.60 0.05 0.00 0.00 1.80 0.06 0.00 0.00 2.00 0.06 0.00 0.00 2.20 0.07 0.00 0.00 2.40 0.08 0.00 0.00 2.60 0.08 0.00 0.00 2.80 0.09 0.00 0.00 3.00 0.10 0.00 0.00 3.20 0.11 0.00 0.00 3.40 0.11 0.00 0.00 3.60 0.12 0.00 0.00 3.80 0.13 0.00 0.00 4.00 0.14 0.00 0.00 4.20 0.15 0.00 0.00 4.40 0.15 0.00 0.00 4.60 0.16 0.00 0.00 4.80 0.17 0.00 0.00 5.00 0.18 0.00 0.00 5.20 0.19 0.00 0.00 5.40 0.20 0.00 0.00 5.60 0.21 0.00 0.00 5.80 0.22 0.00 0.00 6.00 0.23 0.00 0.00 6.20 0.24 0.00 0.00 6.40 0.25 0.00 0.00 6.60 0.26 0.00 0.00 6.80 0.27 0.00 0.01 7.00 0.28 0.00 0.01 7.20 0.30 0.00 0.01 7.40 0.31 0.01 0.01 7.60 0.32 0.01 0.02 7.80 0.33 0.01 0.02 8.00 0.34 0.01 0.02 8.20 0.36 0.01 0.02 8.40 0.37 0.02 0.03 8.60 0.39 0.02 0.03 8.80 0.40 0.03 0.04 9.00 0.42 0.03 0.04 9.20 0.44 0.04 0.05 9.40 0.46 0.04 0.05 9.60 0.48 0.05 0.06 9.80 0.50 0.05 0.06 10.00 0.52 0.06 0.07 10.20 0.54 0.07 0.08 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 10.40 0.57 0.08 0.10 10.60 0.60 0.10 0.11 10.80 0.64 0.11 0.13 11.00 0.67 0.13 0.16 11.20 0.72 0.15 0.20 11.40 0.78 0.19 0.25 11.60 0.88 0.24 0.33 11.80 1.24 0.48 0.96 12.00 1.90 1.01 3.36 12.20 2.01 1.10 3.35 12.40 2.08 1.16 1.29 12.60 2.13 1.21 0.71 12.80 2.18 1.25 0.47 13.00 2.22 1.28 0.38 13.20 2.25 1.31 0.33 13.40 2.28 1.34 0.29 13.60 2.31 1.36 0.26 13.80 2.33 1.38 0.24 14.00 2.35 1.40 0.21 14.20 2.37 1.42 0.20 14.40 2.39 1.44 0.18 14.60 2.41 1.45 0.18 14.80 2.43 1.47 0.17 15.00 2.45 1.49 0.16 15.20 2.47 1.50 0.16 15.40 2.48 1.52 0.15 15.60 2.50 1.53 0.14 15.80 2.51 1.54 0.13 16.00 2.53 1.55 0.13 16.20 2.54 1.57 0.12 16.40 2.55 1.58 0.12 16.60 2.56 1.59 0.11 16.80 2.58 1.60 0.11 17.00 2.59 1.61 0.11 17.20 2.60 1.62 0.11 17.40 2.61 1.63 0.10 17.60 2.62 1.64 0.10 17.80 2.63 1.65 0.10 18.00 2.64 1.66 0.10 18.20 2.65 1.67 0.09 18.40 2.66 1.68 0.09 18.60 2.67 1.69 0.09 18.80 2.68 1.69 0.09 19.00 2.69 1.70 0.08 19.20 2.70 1.71 0.08 19.40 2.71 1.72 0.08 19.60 2.72 1.73 0.08 19.80 2.72 1.73 0.07 20.00 2.73 1.74 0.07 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Summary for Subcatchment 19S: Post Unrouted Area Runoff = 0.23 cfs @ 12.10 hrs, Volume= 0.015 af, Depth> 1.81" Printed 5/28/2021 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Type II 24-hr 1 YR Rainfall=2.87" Area (ac) CN Description 0.070 98 Paved parking, HSG C 0.030 74 >75% Grass cover, Good, HSG C 0.000 66 Woods, Poor, HSG B 0.100 91 Weighted Average 0.030 30.00% Pervious Area 0.070 70.00% Impervious Area Tc Length Slope Velocity Capacity Description 17.3 200 0.0450 0.19 Sheet Flow, Grass: Dense n= 0.240 P2= 3.47" 0.3 200 0.0200 9.68 11.88 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.010 PVC, smooth interior 17.6 400 Total Subcatchment 19S: Post Unrouted Area Hydrograph 0.24 ----- --:--}---I---� 0.23 --------II_-- Type II 24-hr 0.22 _- 02 1 YR Rainfa11=2.8T'-'--1,------11 0.2 018 Runoff Area=0.100 ac----_-_ o1 6 Runoff Volume=0.015 of -I,� 0.15 014 -1 `. 0.13 - Runoff Deipth>1.81"_--'I - -- - - - - - - -T - 012 LL 0.11 0.1 J_f _L _i _I -4 1 ' 0.09 -Tp=47.6 -- - - -- - - -'-- 0.07 0.06 --'------`-------'------`-----I---i 0.05 - - _ 0.04 _a _I -A -J _L _1 -I _4 _J _I _1 I I 0.02 -.-----1-----`--1-------- >0 3d I I I I I I I I I I I I I I I I I I I I -- ---'-- I I I I I I -- ------'-- I I I I I I I I I I I I I I 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Hydrograph for Subcatchment 19S: Post Unrouted Area Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.20 0.01 0.00 0.00 0.40 0.01 0.00 0.00 0.60 0.02 0.00 0.00 0.80 0.02 0.00 0.00 1.00 0.03 0.00 0.00 1.20 0.04 0.00 0.00 1.40 0.04 0.00 0.00 1.60 0.05 0.00 0.00 1.80 0.06 0.00 0.00 2.00 0.06 0.00 0.00 2.20 0.07 0.00 0.00 2.40 0.08 0.00 0.00 2.60 0.08 0.00 0.00 2.80 0.09 0.00 0.00 3.00 0.10 0.00 0.00 3.20 0.11 0.00 0.00 3.40 0.11 0.00 0.00 3.60 0.12 0.00 0.00 3.80 0.13 0.00 0.00 4.00 0.14 0.00 0.00 4.20 0.15 0.00 0.00 4.40 0.15 0.00 0.00 4.60 0.16 0.00 0.00 4.80 0.17 0.00 0.00 5.00 0.18 0.00 0.00 5.20 0.19 0.00 0.00 5.40 0.20 0.00 0.00 5.60 0.21 0.00 0.00 5.80 0.22 0.00 0.00 6.00 0.23 0.00 0.00 6.20 0.24 0.00 0.00 6.40 0.25 0.00 0.00 6.60 0.26 0.00 0.00 6.80 0.27 0.01 0.00 7.00 0.28 0.01 0.00 7.20 0.30 0.01 0.00 7.40 0.31 0.01 0.00 7.60 0.32 0.01 0.00 7.80 0.33 0.02 0.00 8.00 0.34 0.02 0.00 8.20 0.36 0.02 0.00 8.40 0.37 0.03 0.00 8.60 0.39 0.03 0.00 8.80 0.40 0.04 0.00 9.00 0.42 0.04 0.00 9.20 0.44 0.05 0.00 9.40 0.46 0.05 0.00 9.60 0.48 0.06 0.00 9.80 0.50 0.07 0.00 10.00 0.52 0.08 0.00 10.20 0.54 0.09 0.00 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 10.40 0.57 0.10 0.01 10.60 0.60 0.12 0.01 10.80 0.64 0.13 0.01 11.00 0.67 0.16 0.01 11.20 0.72 0.18 0.01 11.40 0.78 0.22 0.01 11.60 0.88 0.28 0.02 11.80 1.24 0.53 0.05 12.00 1.90 1.08 0.18 12.20 2.01 1.17 0.18 12.40 2.08 1.23 0.07 12.60 2.13 1.28 0.04 12.80 2.18 1.32 0.02 13.00 2.22 1.35 0.02 13.20 2.25 1.38 0.02 13.40 2.28 1.41 0.01 13.60 2.31 1.44 0.01 13.80 2.33 1.46 0.01 14.00 2.35 1.48 0.01 14.20 2.37 1.50 0.01 14.40 2.39 1.51 0.01 14.60 2.41 1.53 0.01 14.80 2.43 1.55 0.01 15.00 2.45 1.56 0.01 15.20 2.47 1.58 0.01 15.40 2.48 1.59 0.01 15.60 2.50 1.61 0.01 15.80 2.51 1.62 0.01 16.00 2.53 1.63 0.01 16.20 2.54 1.65 0.01 16.40 2.55 1.66 0.01 16.60 2.56 1.67 0.01 16.80 2.58 1.68 0.01 17.00 2.59 1.69 0.01 17.20 2.60 1.70 0.01 17.40 2.61 1.71 0.01 17.60 2.62 1.72 0.01 17.80 2.63 1.73 0.01 18.00 2.64 1.74 0.00 18.20 2.65 1.75 0.00 18.40 2.66 1.76 0.00 18.60 2.67 1.77 0.00 18.80 2.68 1.78 0.00 19.00 2.69 1.79 0.00 19.20 2.70 1.79 0.00 19.40 2.71 1.80 0.00 19.60 2.72 1.81 0.00 19.80 2.72 1.82 0.00 20.00 2.73 1.82 0.00 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Summary for Pond 2P: EX SWM Facility [441 Hint: Outlet device #3 is below defined storage Printed 5/28/2021 Inflow Area = 4.150 ac, 38.07% Impervious, Inflow Depth > 1.23" for 1 YR event Inflow = 6.22 cfs @ 12.13 hrs, Volume= 0.424 of Outflow = 4.14 cfs @ 12.27 hrs, Volume= 0.422 af, Atten= 33%, Lag= 8.7 min Primary = 4.14 cfs @ 12.27 hrs, Volume= 0.422 of Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs / 3 Peak Elev= 392.08' @ 12.27 hrs Surf.Area= 2,472 sf Storage= 3,132 cf Plug -Flow detention time=11.6 min calculated for 0.421 of (99% of inflow) Center -of -Mass det. time= 9.7 min ( 811.5 - 801.8 ) Volume Invert Avail.Storage Storage Description #1 390.50' 15,349 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 390.50 1,556 0 0 391.00 1,802 840 840 392.00 2,409 2,106 2,945 393.00 3,226 2,818 5,763 394.00 4,794 4,010 9,773 395.00 6,358 5,576 15,349 Device Routing Invert Outlet Devices #1 Primary 390.05' 24.0" Round Culvert L= 53.0' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 390.05' / 389.69' S= 0.0068 '/' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean, Flow Area= 3.14 sf #2 Device 1 392.90' 24.0" x 24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 390.38' 12.0" Round Culvert L= 8.0' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 390.38' / 390.05' S= 0.0412 '/' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean, Flow Area= 0.79 sf Primary OutFlow Max=4.14 cfs @ 12.27 hrs HW=392.08' (Free Discharge) t1=Culvert (Passes 4.14 cfs of 14.01 cfs potential flow) �2=Orifice/Grate ( Controls 0.00 cfs) 3=Culvert (Inlet Controls 4.14 cfs @ 5.27 fps) Storm Calcs-update 5-21-2021 Prepared by Timmons Grow 5 3 Pond 212: EX SWM Facility Hydrograph -Rer'k( F[WV`Fi21` 8' -- -- Stdrage=3y132 cf i Time (hour) Type 1124-hr 1 YR Rainfall=2.87" Printed 5/28/2021 ■ Inflow ■ Primary Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Hydrograph for Pond 2P: EX SWM Facility Time Inflow Storage Elevation Primary (hours) (cfs) (cubic -feet) (feet) (cfs) 0.00 0.00 0 390.50 0.00 0.50 0.00 0 390.50 0.00 1.00 0.00 0 390.50 0.00 1.50 0.00 0 390.50 0.00 2.00 0.00 0 390.50 0.00 2.50 0.00 0 390.50 0.00 3.00 0.00 0 390.50 0.00 3.50 0.00 0 390.50 0.00 4.00 0.00 0 390.50 0.00 4.50 0.00 0 390.50 0.00 5.00 0.00 0 390.50 0.00 5.50 0.00 0 390.50 0.00 6.00 0.00 0 390.50 0.00 6.50 0.00 0 390.50 0.00 7.00 0.00 0 390.50 0.00 7.50 0.00 0 390.50 0.00 8.00 0.00 0 390.50 0.00 8.50 0.00 0 390.50 0.00 9.00 0.00 0 390.50 0.00 9.50 0.01 4 390.50 0.01 10.00 0.03 14 390.51 0.02 10.50 0.06 31 390.52 0.05 11.00 0.13 63 390.54 0.10 11.50 0.27 147 390.59 0.19 12.00 4.09 1,174 391.18 2.05 12.50 1.74 2,171 391.66 3.35 13.00 0.67 610 390.87 0.91 13.50 0.48 401 390.75 0.54 14.00 0.38 319 390.70 0.42 14.50 0.32 265 390.67 0.34 15.00 0.29 237 390.65 0.30 15.50 0.26 214 390.63 0.27 16.00 0.23 189 390.62 0.24 16.50 0.21 166 390.61 0.22 17.00 0.19 154 390.60 0.20 17.50 0.18 144 390.59 0.19 18.00 0.17 134 390.58 0.18 18.50 0.16 123 390.58 0.17 19.00 0.15 112 390.57 0.16 19.50 0.14 100 390.56 0.15 20.00 0.13 89 390.56 0.14 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Summary for Pond 12P: Bioretention 1 Ponding Printed 5/28/2021 Inflow Area = 1.290 ac, 31.01 % Impervious, Inflow Depth > 1.11" for 1 YR event Inflow = 2.92 cfs @ 11.96 hrs, Volume= 0.119 of Outflow = 2.72 cfs @ 11.99 hrs, Volume= 0.119 af, Atten= 7%, Lag= 1.5 min Primary = 2.61 cfs @ 11.99 hrs, Volume= 0.047 of Secondary = 0.12 cfs @ 11.99 hrs, Volume= 0.072 of Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Peak Elev= 401.15' @ 11.99 hrs Surf.Area= 1,283 sf Storage= 1,057 cf Plug -Flow detention time= 47.9 min calculated for 0.119 of (100% of inflow) Center -of -Mass det. time= 47.3 min ( 842.8 - 795.5 ) Volume Invert Avail.Storage Storage Description #1 400.17' 2,580 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 400.17 870 0 0 402.17 1,710 2,580 2,580 Device Routing Invert Outlet Devices #1 Secondary 400.17' 4.000 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 1.00' #2 Primary 400.90' 24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=2.60 cfs @ 11.99 hrs HW=401.15' (Free Discharge) L2=Orif ice/G rate (Weir Controls 2.60 cfs @ 1.64 fps) $econdary OutFlow Max=0.12 cfs @ 11.99 hrs HW=401.15' (Free Discharge) 1=Exfiltration ( Controls 0.12 cfs) Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 1124-hr 1 YR Rainfall=2.87" Printed 5/28/2021 Pond 12P: Bioretention 1 Ponding Hydrograph 2 92 cs -I Inflow Area=11.290 a'Ic rA cAJ 3 " Peak I0=401;02.11 -Sti r,age`-1';,N! cf�- 2 N V 3 0 I I I LL I I I 1 I I I 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Time (hours) ■ Inflow ■ Outflow ■ Primary ■ Secondary Storm Caics-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Hydrograph for Pond 12P: Bioretention 1 Ponding Time Inflow Storage Elevation Outflow Primary Secondary (hours) (cfs) (cubic -feet) (feet) (cfs) (cfs) (cfs) 0.00 0.00 0 400.17 0.00 0.00 0.00 0.50 0.00 0 400.17 0.00 0.00 0.00 1.00 0.00 0 400.17 0.00 0.00 0.00 1.50 0.00 0 400.17 0.00 0.00 0.00 2.00 0.00 0 400.17 0.00 0.00 0.00 2.50 0.00 0 400.17 0.00 0.00 0.00 3.00 0.00 0 400.17 0.00 0.00 0.00 3.50 0.00 0 400.17 0.00 0.00 0.00 4.00 0.00 0 400.17 0.00 0.00 0.00 4.50 0.00 0 400.17 0.00 0.00 0.00 5.00 0.00 0 400.17 0.00 0.00 0.00 5.50 0.00 0 400.17 0.00 0.00 0.00 6.00 0.00 0 400.17 0.00 0.00 0.00 6.50 0.00 0 400.17 0.00 0.00 0.00 7.00 0.00 0 400.17 0.00 0.00 0.00 7.50 0.00 0 400.17 0.00 0.00 0.00 8.00 0.00 0 400.17 0.00 0.00 0.00 8.50 0.00 0 400.17 0.00 0.00 0.00 9.00 0.00 0 400.17 0.00 0.00 0.00 9.50 0.00 0 400.17 0.00 0.00 0.00 10.00 0.01 1 400.17 0.00 0.00 0.00 10.50 0.02 3 400.17 0.01 0.00 0.01 11.00 0.04 7 400.18 0.03 0.00 0.03 11.50 0.09 19 400.19 0.08 0.00 0.08 12.00 2.55 1,055 401.15 2.69 2.57 0.12 12.50 0.25 795 400.94 0.28 0.17 0.11 13.00 0.16 770 400.92 0.17 0.06 0.11 13.50 0.13 759 400.91 0.13 0.02 0.11 14.00 0.10 746 400.90 0.11 0.00 0.11 14.50 0.09 718 400.87 0.11 0.00 0.11 15.00 0.08 677 400.84 0.11 0.00 0.11 15.50 0.07 623 400.79 0.10 0.00 0.10 16.00 0.06 557 400.73 0.10 0.00 0.10 16.50 0.06 484 400.67 0.10 0.00 0.10 17.00 0.06 410 400.60 0.10 0.00 0.10 17.50 0.05 335 400.52 0.09 0.00 0.09 18.00 0.05 260 400.45 0.09 0.00 0.09 18.50 0.05 184 400.37 0.09 0.00 0.09 19.00 0.04 108 400.29 0.09 0.00 0.09 19.50 0.04 32 400.21 0.08 0.00 0.08 20.00 0.04 8 400.18 0.04 0.00 0.04 Printed 5/28/2021 Storm Caics-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Summary for Pond 13P: Bioretention 1 Media [441 Hint: Outlet device #1 is below defined storage Printed 5/28/2021 Inflow = 0.12 cfs @ 11.99 hrs, Volume= 0.072 of Outflow = 0.12 cfs @ 12.00 hrs, Volume= 0.072 af, Atten= 0%, Lag= 0.6 min Primary = 0.12 cfs @ 12.00 hrs, Volume= 0.072 of Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Peak Elev= 396.18' @ 12.00 hrs Surf.Area= 870 sf Storage= 4 cf Plug -Flow detention time= 0.6 min calculated for 0.072 of (100% of inflow) Center -of -Mass det. time= 0.5 min ( 915.7 - 915.2 ) Volume Invert Avail.Storage Storage Description #1 396.17' 1,131 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic -feet) (cubic -feet) 396.17 870 0.0 0 0 398.17 870 40.0 696 696 400.17 870 25.0 435 1,131 Device Routing Invert Outlet Devices #1 Primary 395.24' 4.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.37 cfs @ 12.00 hrs HW=396.18' (Free Discharge) t1=Orifice/Grate (Orifice Controls 0.37 cfs @ 4.24 fps) Storm Caics-update 5-21-2021 Prepared by Timmons Grow Type 1124-hr 1 YR Rainfall=2.87" Printed 5/28/2021 Pond 1312: Bioretention 1 Media Hydrograph id le T396,4811 0.13 ---- 012 d. 0 iz ors 0.12 - 0.11 o, 1 Storage=4'cf 0.09 _ 0.08------- = 0.07 --i--J 3 LL 0.05 - - - 1 2 3 4 5 6 7 8 9 10 11 Time (hours) 1 ■Inflow 11 ■Primary Storm Caics-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Hydrograph for Pond 13P: Bioretention 1 Media Time Inflow Storage Elevation Primary (hours) (cfs) (cubic -feet) (feet) (cfs) 0.00 0.00 0 396.17 0.00 0.50 0.00 0 396.17 0.00 1.00 0.00 0 396.17 0.00 1.50 0.00 0 396.17 0.00 2.00 0.00 0 396.17 0.00 2.50 0.00 0 396.17 0.00 3.00 0.00 0 396.17 0.00 3.50 0.00 0 396.17 0.00 4.00 0.00 0 396.17 0.00 4.50 0.00 0 396.17 0.00 5.00 0.00 0 396.17 0.00 5.50 0.00 0 396.17 0.00 6.00 0.00 0 396.17 0.00 6.50 0.00 0 396.17 0.00 7.00 0.00 0 396.17 0.00 7.50 0.00 0 396.17 0.00 8.00 0.00 0 396.17 0.00 8.50 0.00 0 396.17 0.00 9.00 0.00 0 396.17 0.00 9.50 0.00 0 396.17 0.00 10.00 0.00 0 396.17 0.00 10.50 0.01 1 396.17 0.01 11.00 0.03 1 396.17 0.03 11.50 0.08 3 396.18 0.08 12.00 0.12 4 396.18 0.12 12.50 0.11 4 396.18 0.11 13.00 0.11 4 396.18 0.11 13.50 0.11 4 396.18 0.11 14.00 0.11 4 396.18 0.11 14.50 0.11 4 396.18 0.11 15.00 0.11 4 396.18 0.11 15.50 0.10 4 396.18 0.10 16.00 0.10 4 396.18 0.10 16.50 0.10 4 396.18 0.10 17.00 0.10 4 396.18 0.10 17.50 0.09 3 396.18 0.09 18.00 0.09 3 396.18 0.09 18.50 0.09 3 396.18 0.09 19.00 0.09 3 396.18 0.09 19.50 0.08 3 396.18 0.08 20.00 0.04 1 396.17 0.04 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Summary for Pond 15P: Bioretention 2 Ponding Printed 5/28/2021 Inflow Area = 0.880 ac, 76.14% Impervious, Inflow Depth > 1.91" for 1 YR event Inflow = 3.17 cfs @ 11.96 hrs, Volume= 0.140 of Outflow = 2.60 cfs @ 12.00 hrs, Volume= 0.140 af, Atten= 18%, Lag= 2.6 min Primary = 2.41 cfs @ 12.00 hrs, Volume= 0.044 of Secondary = 0.20 cfs @ 12.00 hrs, Volume= 0.096 of Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Peak Elev= 399.79' @ 12.00 hrs Surf.Area= 2,132 sf Storage= 1,473 cf Plug -Flow detention time= 28.2 min calculated for 0.140 of (100% of inflow) Center -of -Mass det. time= 27.7 min ( 789.3 - 761.7 ) Volume Invert Avail.Storage Storage Description #1 399.00' 4,550 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 399.00 1,596 0 0 401.00 2,954 4,550 4,550 Device Routing Invert Outlet Devices #1 Secondary 399.00' 4.000 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 1.00' #2 Primary 399.50' 18.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=2.40 cfs @ 12.00 hrs HW=399.79' (Free Discharge) L2=Orif ice/G rate (Weir Controls 2.40 cfs @ 1.76 fps) $econdary OutFlow Max=0.20 cfs @ 12.00 hrs HW=399.79' (Free Discharge) 1=Exfiltration ( Controls 0.20 cfs) Storm Caics-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Printed 5/28/2021 Pond 15P: Bioretention 2 Ponding Hydrograph li li ■ Inflow F Ip{�I�icc�Ip Ios.Iy� ®I a.n ors ❑ Outflow Ihflo 1I Areg=0.v8©_a\i_�___ __ �__ ❑Primary 0 Secondary Peak rzlev=399.791 ivi 3 2 60 ors Storage=1,473 cf 2 41 ch in 2 I I I I I I I I I I I I I O LL 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Time (hours) Storm Caics-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Hydrograph for Pond 15P: Bioretention 2 Ponding Time Inflow Storage Elevation Outflow Primary Secondary (hours) (cfs) (cubic -feet) (feet) (cfs) (cfs) (cfs) 0.00 0.00 0 399.00 0.00 0.00 0.00 0.50 0.00 0 399.00 0.00 0.00 0.00 1.00 0.00 0 399.00 0.00 0.00 0.00 1.50 0.00 0 399.00 0.00 0.00 0.00 2.00 0.00 0 399.00 0.00 0.00 0.00 2.50 0.00 0 399.00 0.00 0.00 0.00 3.00 0.00 0 399.00 0.00 0.00 0.00 3.50 0.00 0 399.00 0.00 0.00 0.00 4.00 0.00 0 399.00 0.00 0.00 0.00 4.50 0.00 0 399.00 0.00 0.00 0.00 5.00 0.00 0 399.00 0.00 0.00 0.00 5.50 0.00 0 399.00 0.00 0.00 0.00 6.00 0.00 1 399.00 0.00 0.00 0.00 6.50 0.01 2 399.00 0.01 0.00 0.01 7.00 0.01 2 399.00 0.01 0.00 0.01 7.50 0.01 3 399.00 0.01 0.00 0.01 8.00 0.02 3 399.00 0.02 0.00 0.02 8.50 0.02 5 399.00 0.02 0.00 0.02 9.00 0.03 6 399.00 0.03 0.00 0.03 9.50 0.04 8 399.00 0.03 0.00 0.03 10.00 0.05 10 399.01 0.05 0.00 0.05 10.50 0.07 14 399.01 0.07 0.00 0.07 11.00 0.10 21 399.01 0.10 0.00 0.10 11.50 0.19 45 399.03 0.15 0.00 0.15 12.00 2.66 1,472 399.79 2.60 2.41 0.20 12.50 0.24 960 399.54 0.30 0.12 0.18 13.00 0.15 885 399.50 0.18 0.00 0.18 13.50 0.11 800 399.46 0.18 0.00 0.18 14.00 0.09 668 399.39 0.17 0.00 0.17 14.50 0.08 514 399.30 0.17 0.00 0.17 15.00 0.07 355 399.21 0.16 0.00 0.16 15.50 0.06 193 399.12 0.16 0.00 0.16 16.00 0.06 27 399.02 0.13 0.00 0.13 16.50 0.05 11 399.01 0.05 0.00 0.05 17.00 0.05 11 399.01 0.05 0.00 0.05 17.50 0.05 10 399.01 0.05 0.00 0.05 18.00 0.04 9 399.01 0.04 0.00 0.04 18.50 0.04 9 399.01 0.04 0.00 0.04 19.00 0.04 8 399.01 0.04 0.00 0.04 19.50 0.03 7 399.00 0.03 0.00 0.03 20.00 0.03 7 399.00 0.03 0.00 0.03 Printed 5/28/2021 Storm Caics-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Summary for Pond 16P: Bioretention 2 Media Printed 5/28/2021 Inflow = 0.20 cfs @ 12.00 hrs, Volume= 0.096 of Outflow = 0.19 cfs @ 12.17 hrs, Volume= 0.074 af, Atten= 6%, Lag= 10.1 min Primary = 0.19 cfs @ 12.17 hrs, Volume= 0.074 of Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Peak Elev= 395.41' @ 12.17 hrs Surf.Area= 1,500 sf Storage= 995 cf Plug -Flow detention time=123.4 min calculated for 0.074 of (78% of inflow) Center -of -Mass det. time= 62.9 min ( 881.7 - 818.8 ) Volume Invert Avail.Storage Storage Description #1 393.75' 2,419 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic -feet) (cubic -feet) 393.75 1,500 0.0 0 0 395.75 1,500 40.0 1,200 1,200 399.00 1,500 25.0 1,219 2,419 Device Routing Invert Outlet Devices #1 Primary 395.24' 4.0" Vert. Orifice/Grate X 3.00 C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.18 cfs @ 12.17 hrs HW=395.41' (Free Discharge) L1 =Orif ice/G rate (Orifice Controls 0.18 cfs @ 1.40 fps) Storm Caics-update 5-21-2021 Prepared by Timmons Grow Type 1124-hr 1 YR Rainfall=2.87" Printed 5/28/2021 Pond 1612: Bioretention 2 Media Hydrograph r__-___i___r�_�r__r___i___r__+rq�__r___r__r__-___i___r__r__I___i___r__ 0.22 i;=G�7\-f4?�;.4?f`;I- o.zn cra=-==---------------�--- 0.21 , 0.2 o.ie cr: Ir__ r__-___'i___'r__ 0.19�y _________________________ - _-- -- ------I_-- 0.17 - 4«�r`+�r----7-- __ *--7---r--r-- 0.16 ---. -- ------I_-- 014 _ 0.13 u 0.12 ,' __'__�-----_- - - - -_.--------�-- 3 011 � 01 0.09 ---------'--- --------�-- 0.08 0.07 __J___I I I r r 00 0 __�___i__r___i _ 0.03 �'--+--�-- --i -- i__J__i___ L__ i__ J___1___L__ 0.02 0.01 4 5 6 7 8 9 10 11 Time (hours) ■ Inflow ■ Primary Storm Caics-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Hydrograph for Pond 16P: Bioretention 2 Media Time Inflow Storage Elevation Primary (hours) (cfs) (cubic -feet) (feet) (cfs) 0.00 0.00 0 393.75 0.00 0.50 0.00 0 393.75 0.00 1.00 0.00 0 393.75 0.00 1.50 0.00 0 393.75 0.00 2.00 0.00 0 393.75 0.00 2.50 0.00 0 393.75 0.00 3.00 0.00 0 393.75 0.00 3.50 0.00 0 393.75 0.00 4.00 0.00 0 393.75 0.00 4.50 0.00 0 393.75 0.00 5.00 0.00 0 393.75 0.00 5.50 0.00 2 393.75 0.00 6.00 0.00 8 393.76 0.00 6.50 0.01 19 393.78 0.00 7.00 0.01 35 393.81 0.00 7.50 0.01 55 393.84 0.00 8.00 0.02 81 393.89 0.00 8.50 0.02 115 393.94 0.00 9.00 0.03 161 394.02 0.00 9.50 0.03 220 394.12 0.00 10.00 0.05 291 394.23 0.00 10.50 0.07 389 394.40 0.00 11.00 0.10 534 394.64 0.00 11.50 0.15 764 395.02 0.00 12.00 0.20 988 395.40 0.16 12.50 0.18 994 395.41 0.18 13.00 0.18 993 395.40 0.18 13.50 0.18 992 395.40 0.18 14.00 0.17 990 395.40 0.17 14.50 0.17 989 395.40 0.17 15.00 0.16 987 395.40 0.16 15.50 0.16 985 395.39 0.16 16.00 0.13 982 395.39 0.15 16.50 0.05 946 395.33 0.05 17.00 0.05 944 395.32 0.05 17.50 0.05 942 395.32 0.05 18.00 0.04 940 395.32 0.04 18.50 0.04 938 395.31 0.04 19.00 0.04 935 395.31 0.04 19.50 0.03 933 395.31 0.04 20.00 0.03 931 395.30 0.03 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Summary for Pond 18P: Modified SWM Facility [441 Hint: Outlet device #2 is below defined storage Printed 5/28/2021 Inflow Area = 4.150 ac, 57.83% Impervious, Inflow Depth > 1.51" for 1 YR event Inflow = 8.71 cfs @ 12.01 hrs, Volume= 0.523 of Outflow = 2.37 cfs @ 12.35 hrs, Volume= 0.514 af, Atten= 73%, Lag= 20.0 min Primary = 2.37 cfs @ 12.35 hrs, Volume= 0.514 of Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs / 3 Peak Elev= 392.51' @ 12.35 hrs Surf.Area= 3,573 sf Storage= 7,006 cf Plug -Flow detention time= 36.9 min calculated for 0.514 of (98% of inflow) Center -of -Mass det. time= 30.5 min ( 834.5 - 803.9 ) Volume Invert Avail.Storage Storage Description #1 390.20' 17,357 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 390.20 2,498 0 0 395.00 4,734 17,357 17,357 Device Routing Invert Outlet Devices #1 Primary 390.19' 24.0" Round Culvert L= 52.0' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 390.19' / 389.65' S= 0.0104 '/' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean, Flow Area= 3.14 sf #2 Device 1 389.20' 7.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 392.40' 24.0" W x 18.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 393.90' 24.0" x 24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=2.37 cfs @ 12.35 hrs HW=392.51' (Free Discharge) t1=Culvert (Passes 2.37 cfs of 17.37 cfs potential flow) 2=Orifice/Grate (Orifice Controls 2.14 cfs @ 7.33 fps) 3=Orifice/Grate (Orifice Controls 0.23 cfs @ 1.05 fps) =Orifice/Grate ( Controls 0.00 cfs) Storm Calcs-update 5-21-2021 Prepared by Timmons Grow Type 1124-hr 1 YR Rainfall=2.87" Pond 1812: Modified SWM Facility Hydrograph --r - - -, n k)w eia 150 a r 9 -� I � I I � QQ� C� F�-li-- 8 -ReOk F-��n2,,5'1' - III---j __ -Stdra+ge--7��f I I I I I I I I I I I 6 _ - —T —I —I— —i —� I I I I I I 5 I I I I I I I I I I I X 4 I I I I I I I I I I , 8----li---L- 2 Time (hour) Printed 5/28/2021 I I I I I I I I I I I I I I I__ � Inflow r r r ■ Pdmary ]i cfa I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I II I I I I I I I I I I I I I I I I I I I I r� _t_ i__ I I I I I I I I I I I I I I I I I I I I I I I Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Hydrograph for Pond 18P: Modified SWM Facility Time Inflow Storage Elevation Primary (hours) (cfs) (cubic -feet) (feet) (cfs) 0.00 0.00 0 390.20 0.00 0.50 0.00 0 390.20 0.00 1.00 0.00 0 390.20 0.00 1.50 0.00 0 390.20 0.00 2.00 0.00 0 390.20 0.00 2.50 0.00 0 390.20 0.00 3.00 0.00 0 390.20 0.00 3.50 0.00 0 390.20 0.00 4.00 0.00 0 390.20 0.00 4.50 0.00 0 390.20 0.00 5.00 0.00 0 390.20 0.00 5.50 0.00 0 390.20 0.00 6.00 0.00 0 390.20 0.00 6.50 0.00 2 390.20 0.00 7.00 0.01 11 390.20 0.00 7.50 0.01 26 390.21 0.00 8.00 0.02 46 390.22 0.01 8.50 0.03 71 390.23 0.01 9.00 0.04 107 390.24 0.02 9.50 0.06 151 390.26 0.03 10.00 0.08 190 390.28 0.05 10.50 0.12 251 390.30 0.08 11.00 0.20 341 390.33 0.13 11.50 0.37 489 390.39 0.26 12.00 8.63 2,870 391.25 1.44 12.50 1.51 6,782 392.44 2.18 13.00 0.73 4,976 391.92 1.85 13.50 0.58 3,124 391.33 1.50 14.00 0.50 1,715 390.85 1.14 14.50 0.46 850 390.53 0.70 15.00 0.43 675 390.46 0.46 15.50 0.41 640 390.45 0.42 16.00 0.38 618 390.44 0.39 16.50 0.27 536 390.41 0.30 17.00 0.26 501 390.40 0.27 17.50 0.24 486 390.39 0.25 18.00 0.23 472 390.39 0.24 18.50 0.22 458 390.38 0.23 19.00 0.21 444 390.37 0.22 19.50 0.20 429 390.37 0.20 20.00 0.14 383 390.35 0.16 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Printed 5/28/2021 Summary for Link 4L: Pre Analysis Point 1 Inflow Area = 4.250 ac, 37.18% Impervious, Inflow Depth > 1.21" for 1 YR event Inflow = 4.20 cfs @ 12.27 hrs, Volume= 0.428 of Primary = 4.20 cfs @ 12.27 hrs, Volume= 0.428 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Link 4L: Pre Analysis Point 1 Hydrograph FE ]—I n—fl.—. ❑ Primary Time (hours) Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Hydrograph for Link 4L: Pre Analysis Point 1 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 0.20 0.00 0.00 0.00 0.40 0.00 0.00 0.00 0.60 0.00 0.00 0.00 0.80 0.00 0.00 0.00 1.00 0.00 0.00 0.00 1.20 0.00 0.00 0.00 1.40 0.00 0.00 0.00 1.60 0.00 0.00 0.00 1.80 0.00 0.00 0.00 2.00 0.00 0.00 0.00 2.20 0.00 0.00 0.00 2.40 0.00 0.00 0.00 2.60 0.00 0.00 0.00 2.80 0.00 0.00 0.00 3.00 0.00 0.00 0.00 3.20 0.00 0.00 0.00 3.40 0.00 0.00 0.00 3.60 0.00 0.00 0.00 3.80 0.00 0.00 0.00 4.00 0.00 0.00 0.00 4.20 0.00 0.00 0.00 4.40 0.00 0.00 0.00 4.60 0.00 0.00 0.00 4.80 0.00 0.00 0.00 5.00 0.00 0.00 0.00 5.20 0.00 0.00 0.00 5.40 0.00 0.00 0.00 5.60 0.00 0.00 0.00 5.80 0.00 0.00 0.00 6.00 0.00 0.00 0.00 6.20 0.00 0.00 0.00 6.40 0.00 0.00 0.00 6.60 0.00 0.00 0.00 6.80 0.00 0.00 0.00 7.00 0.00 0.00 0.00 7.20 0.00 0.00 0.00 7.40 0.00 0.00 0.00 7.60 0.00 0.00 0.00 7.80 0.00 0.00 0.00 8.00 0.00 0.00 0.00 8.20 0.00 0.00 0.00 8.40 0.00 0.00 0.00 8.60 0.00 0.00 0.00 8.80 0.00 0.00 0.00 9.00 0.00 0.00 0.00 9.20 0.00 0.00 0.00 9.40 0.00 0.00 0.00 9.60 0.01 0.00 0.01 9.80 0.02 0.00 0.02 10.00 0.02 0.00 0.02 10.20 0.03 0.00 0.03 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 10.40 0.04 0.00 0.04 10.60 0.06 0.00 0.06 10.80 0.08 0.00 0.08 11.00 0.10 0.00 0.10 11.20 0.13 0.00 0.13 11.40 0.17 0.00 0.17 11.60 0.23 0.00 0.23 11.80 0.47 0.00 0.47 12.00 2.10 0.00 2.10 12.20 4.07 0.00 4.07 12.40 3.88 0.00 3.88 12.60 2.76 0.00 2.76 12.80 1.49 0.00 1.49 13.00 0.92 0.00 0.92 13.20 0.70 0.00 0.70 13.40 0.59 0.00 0.59 13.60 0.52 0.00 0.52 13.80 0.47 0.00 0.47 14.00 0.42 0.00 0.42 14.20 0.39 0.00 0.39 14.40 0.36 0.00 0.36 14.60 0.34 0.00 0.34 14.80 0.32 0.00 0.32 15.00 0.31 0.00 0.31 15.20 0.29 0.00 0.29 15.40 0.28 0.00 0.28 15.60 0.27 0.00 0.27 15.80 0.26 0.00 0.26 16.00 0.25 0.00 0.25 16.20 0.23 0.00 0.23 16.40 0.22 0.00 0.22 16.60 0.22 0.00 0.22 16.80 0.21 0.00 0.21 17.00 0.20 0.00 0.20 17.20 0.20 0.00 0.20 17.40 0.19 0.00 0.19 17.60 0.19 0.00 0.19 17.80 0.19 0.00 0.19 18.00 0.18 0.00 0.18 18.20 0.18 0.00 0.18 18.40 0.17 0.00 0.17 18.60 0.17 0.00 0.17 18.80 0.16 0.00 0.16 19.00 0.16 0.00 0.16 19.20 0.16 0.00 0.16 19.40 0.15 0.00 0.15 19.60 0.15 0.00 0.15 19.80 0.14 0.00 0.14 20.00 0.14 0.00 0.14 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Printed 5/28/2021 Summary for Link 20L: Post Analysis Point 1 Inflow Area = 4.250 ac, 58.12% Impervious, Inflow Depth > 1.49" for 1 YR event Inflow = 2.45 cfs @ 12.34 hrs, Volume= 0.529 of Primary = 2.45 cfs @ 12.34 hrs, Volume= 0.529 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Link 20L: Post Analysis Point 1 Hydrograph FE ]—I n—fl.—. ❑ Primary Time (hours) Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 1 YR Rainfall=2.87" Hydrograph for Link 20L: Post Analysis Point 1 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 0.20 0.00 0.00 0.00 0.40 0.00 0.00 0.00 0.60 0.00 0.00 0.00 0.80 0.00 0.00 0.00 1.00 0.00 0.00 0.00 1.20 0.00 0.00 0.00 1.40 0.00 0.00 0.00 1.60 0.00 0.00 0.00 1.80 0.00 0.00 0.00 2.00 0.00 0.00 0.00 2.20 0.00 0.00 0.00 2.40 0.00 0.00 0.00 2.60 0.00 0.00 0.00 2.80 0.00 0.00 0.00 3.00 0.00 0.00 0.00 3.20 0.00 0.00 0.00 3.40 0.00 0.00 0.00 3.60 0.00 0.00 0.00 3.80 0.00 0.00 0.00 4.00 0.00 0.00 0.00 4.20 0.00 0.00 0.00 4.40 0.00 0.00 0.00 4.60 0.00 0.00 0.00 4.80 0.00 0.00 0.00 5.00 0.00 0.00 0.00 5.20 0.00 0.00 0.00 5.40 0.00 0.00 0.00 5.60 0.00 0.00 0.00 5.80 0.00 0.00 0.00 6.00 0.00 0.00 0.00 6.20 0.00 0.00 0.00 6.40 0.00 0.00 0.00 6.60 0.00 0.00 0.00 6.80 0.00 0.00 0.00 7.00 0.00 0.00 0.00 7.20 0.00 0.00 0.00 7.40 0.01 0.00 0.01 7.60 0.01 0.00 0.01 7.80 0.01 0.00 0.01 8.00 0.01 0.00 0.01 8.20 0.01 0.00 0.01 8.40 0.01 0.00 0.01 8.60 0.02 0.00 0.02 8.80 0.02 0.00 0.02 9.00 0.02 0.00 0.02 9.20 0.03 0.00 0.03 9.40 0.03 0.00 0.03 9.60 0.04 0.00 0.04 9.80 0.05 0.00 0.05 10.00 0.05 0.00 0.05 10.20 0.06 0.00 0.06 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 10.40 0.07 0.00 0.07 10.60 0.09 0.00 0.09 10.80 0.12 0.00 0.12 11.00 0.14 0.00 0.14 11.20 0.18 0.00 0.18 11.40 0.24 0.00 0.24 11.60 0.32 0.00 0.32 11.80 0.57 0.00 0.57 12.00 1.62 0.00 1.62 12.20 2.24 0.00 2.24 12.40 2.40 0.00 2.40 12.60 2.11 0.00 2.11 12.80 1.99 0.00 1.99 13.00 1.87 0.00 1.87 13.20 1.73 0.00 1.73 13.40 1.59 0.00 1.59 13.60 1.44 0.00 1.44 13.80 1.30 0.00 1.30 14.00 1.15 0.00 1.15 14.20 1.01 0.00 1.01 14.40 0.85 0.00 0.85 14.60 0.61 0.00 0.61 14.80 0.51 0.00 0.51 15.00 0.47 0.00 0.47 15.20 0.45 0.00 0.45 15.40 0.43 0.00 0.43 15.60 0.42 0.00 0.42 15.80 0.41 0.00 0.41 16.00 0.40 0.00 0.40 16.20 0.37 0.00 0.37 16.40 0.33 0.00 0.33 16.60 0.30 0.00 0.30 16.80 0.28 0.00 0.28 17.00 0.27 0.00 0.27 17.20 0.27 0.00 0.27 17.40 0.26 0.00 0.26 17.60 0.25 0.00 0.25 17.80 0.25 0.00 0.25 18.00 0.25 0.00 0.25 18.20 0.24 0.00 0.24 18.40 0.24 0.00 0.24 18.60 0.23 0.00 0.23 18.80 0.23 0.00 0.23 19.00 0.22 0.00 0.22 19.20 0.22 0.00 0.22 19.40 0.21 0.00 0.21 19.60 0.20 0.00 0.20 19.80 0.19 0.00 0.19 20.00 0.17 0.00 0.17 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Type II 24-hr 10 YR Rainfall=5.25" Prepared by Timmons Group Printed 5/28/2021 HydroCAD® 10.10-4a s/n 08663 © 2020 HydroCAD Software Solutions LLC Page 42 Time span=0.00-20.00 hrs, dt=0.01 hrs, 2001 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment1S: Pre SWM Facility Runoff Area=4.150 ac 38.07% Impervious Runoff Depth >3.15" Flow Length=375' Tc=19.7 min CN=83 Runoff=15.75 cfs 1.090 of Subcatchment3S: Pre Unrouted Area Runoff Area=0.100 ac 0.00% Impervious Runoff Depth>2.35" Flow Length=375' Tc=19.7 min CN=74 Runoff=0.29 cfs 0.020 of Subcatchment11S:BioretentionlArea Runoff Area=1.290ac 31.01%Impervious Runoff Depth>2.98" Tc=5.0 min CN=81 Runoff=7.52 cfs 0.320 of Subcatchment14S: Bioretention2 Area Runoff Area=0.880 ac 76.14% Impervious Runoff Depth>4.08" Tc=5.0 min CN=92 Runoff=6.40 cfs 0.299 of Subcatchment17S: Remaining Post SWM Runoff Area=1.980 ac 67.17% Impervious Runoff Depth>3.86" Flow Length=400' Tc=17.6 min CN=90 Runoff=9.36 cfs 0.636 of Subcatchment19S: Post Unrouted Area Runoff Area=0.100 ac 70.00% Impervious Runoff Depth>3.96" Flow Length=400' Tc=17.6 min CN=91 Runoff=0.48 cfs 0.033 of Pond 2P: EX SWM Facility Peak Elev=393.37' Storage=7,077 cf Inflow=15.75 cfs 1.090 of Outflow=14.50 cfs 1.085 of Pond 12P: Bioretention1l Ponding Peak EIev=401.40' Storage=1,383 cf Inflow=7.52 cfs 0.320 of Primary=7.20 cfs 0.209 of Secondary=0.13 cfs 0.096 of Outflow=7.32 cfs 0.305 of Pond 13P: Bioretention1l Media Peak EIev=396.18' Storage=5 cf Inflow=0.13 cfs 0.096 of Outflow=0.13 cfs 0.096 of Pond 15P: Bioretention2 Ponding Peak EIev=400.01' Storage=1,968 cf Inflow=6.40 cfs 0.299 of Primary=5.69 cfs 0.146 of Secondary=0.21 cfs 0.153 of Outflow=5.90 cfs 0.299 of Pond 16P: Bioretention2 Media Peak EIev=395.42' Storage=1,001 cf Inflow=0.21 cfs 0.153 of Outflow=0.21 cfs 0.131 of Pond 18P: Modified SWM Facility Peak EIev=393.85' Storage=12,207 cf Inflow=20.19 cfs 1.219 of Outflow=13.86 cfs 1.206 of Link 4L: Pre Analysis Point 1 Inflow=14.77 cfs 1.105 of Primary=14.77 cfs 1.105 of Link 20L: Post Analysis Point 1 Inflow=14.34 cfs 1.239 of Primary=14.34 cfs 1.239 of Total Runoff Area = 8.500 ac Runoff Volume = 2.399 of Average Runoff Depth = 3.39" 52.35% Pervious = 4.450 ac 47.65% Impervious = 4.050 ac Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Printed 5/28/2021 Summary for Subcatchment 1S: Pre SWM Facility Drainage Area Runoff = 15.75 cfs @ 12.12 hrs, Volume= 1.090 af, Depth> 3.15" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Type II 24-hr 10 YR Rainfall=5.25 Area (ac) CN Description 1.580 98 Paved parking, HSG C 2.470 74 >75% Grass cover, Good, HSG C 0.100 66 Woods, Poor, HSG B 4.150 83 Weighted Average 2.570 61.93% Pervious Area 1.580 38.07% Impervious Area Tc Length Capacity Description 17.3 200 0.0450 0.19 Sheet Flow, Grass: Dense n= 0.240 P2= 3.47" 2.4 175 0.0300 1.21 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 19.7 375 Total Subcatchment 1S: Pre SWM Facility Drainage Area Hydrograph 15 , Type II 24-hr 14 10 YR Rainfall=5.25" 12 Runoff Area=4.150 ac 11 Runoff Volume=1.090 of Runoff Depth>3.15` -- - -- ° 8 Flow Leng th=375'i__i___7. LL Tc=19.7 min ; ------L------I--i-- 5 CIF=,83' 4 2 I I I I I 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Printed 5/28/2021 Hydrograph for Subcatchment 1S: Pre SWM Facility Drainage Area Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.20 0.01 0.00 0.00 0.40 0.02 0.00 0.00 0.60 0.03 0.00 0.00 0.80 0.04 0.00 0.00 1.00 0.06 0.00 0.00 1.20 0.07 0.00 0.00 1.40 0.08 0.00 0.00 1.60 0.09 0.00 0.00 1.80 0.10 0.00 0.00 2.00 0.12 0.00 0.00 2.20 0.13 0.00 0.00 2.40 0.14 0.00 0.00 2.60 0.15 0.00 0.00 2.80 0.17 0.00 0.00 3.00 0.18 0.00 0.00 3.20 0.19 0.00 0.00 3.40 0.21 0.00 0.00 3.60 0.22 0.00 0.00 3.80 0.24 0.00 0.00 4.00 0.25 0.00 0.00 4.20 0.27 0.00 0.00 4.40 0.28 0.00 0.00 4.60 0.30 0.00 0.00 4.80 0.31 0.00 0.00 5.00 0.33 0.00 0.00 5.20 0.35 0.00 0.00 5.40 0.37 0.00 0.00 5.60 0.38 0.00 0.00 5.80 0.40 0.00 0.00 6.00 0.42 0.00 0.00 6.20 0.44 0.00 0.00 6.40 0.46 0.00 0.01 6.60 0.48 0.00 0.02 6.80 0.50 0.00 0.02 7.00 0.52 0.01 0.03 7.20 0.54 0.01 0.04 7.40 0.56 0.01 0.05 7.60 0.58 0.01 0.06 7.80 0.61 0.02 0.07 8.00 0.63 0.02 0.07 8.20 0.65 0.03 0.08 8.40 0.68 0.03 0.10 8.60 0.71 0.04 0.12 8.80 0.74 0.05 0.14 9.00 0.77 0.05 0.16 9.20 0.81 0.06 0.18 9.40 0.84 0.07 0.20 9.60 0.87 0.09 0.22 9.80 0.91 0.10 0.23 10.00 0.95 0.11 0.27 10.20 0.99 0.13 0.31 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 10.40 1.04 0.15 0.36 10.60 1.10 0.17 0.42 10.80 1.16 0.20 0.50 11.00 1.23 0.24 0.60 11.20 1.32 0.28 0.72 11.40 1.43 0.34 0.92 11.60 1.61 0.44 1.21 11.80 2.26 0.88 3.16 12.00 3.48 1.84 11.15 12.20 3.67 2.00 13.68 12.40 3.81 2.12 5.75 12.60 3.90 2.20 3.06 12.80 3.98 2.27 1.96 13.00 4.05 2.33 1.51 13.20 4.11 2.39 1.28 13.40 4.17 2.43 1.13 13.60 4.22 2.48 1.02 13.80 4.26 2.52 0.92 14.00 4.31 2.55 0.83 14.20 4.34 2.59 0.76 14.40 4.38 2.62 0.71 14.60 4.41 2.65 0.68 14.80 4.45 2.68 0.65 15.00 4.48 2.71 0.63 15.20 4.51 2.74 0.60 15.40 4.54 2.76 0.57 15.60 4.57 2.79 0.55 15.80 4.60 2.81 0.52 16.00 4.62 2.83 0.49 16.20 4.64 2.85 0.47 16.40 4.67 2.87 0.45 16.60 4.69 2.90 0.44 16.80 4.71 2.92 0.43 17.00 4.73 2.93 0.42 17.20 4.76 2.95 0.41 17.40 4.78 2.97 0.40 17.60 4.80 2.99 0.39 17.80 4.82 3.01 0.38 18.00 4.84 3.03 0.37 18.20 4.85 3.04 0.36 18.40 4.87 3.06 0.35 18.60 4.89 3.07 0.34 18.80 4.91 3.09 0.33 19.00 4.92 3.10 0.32 19.20 4.94 3.12 0.31 19.40 4.95 3.13 0.30 19.60 4.97 3.15 0.29 19.80 4.98 3.16 0.28 20.00 5.00 3.17 0.27 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Summary for Subcatchment 3S: Pre Unrouted Area Runoff = 0.29 cfs @ 12.13 hrs, Volume= 0.020 af, Depth> 2.35" Printed 5/28/2021 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Type II 24-hr 10 YR Rainfall=5.25" Area (ac) CN Description 0.000 98 Paved parking, HSG C 0.100 74 >75% Grass cover, Good, HSG C 0.100 74 Weighted Average 0.100 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.3 200 0.0450 0.19 Sheet Flow, Grass: Dense n= 0.240 P2= 3.47" 2.4 175 0.0300 1.21 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fos 19.7 375 Total Subcatchment 3S: Pre Unrouted Area Hydrograph 0.32 0.3 r yp-e --- hr o.zs T IIL24- L--;---'---L--J 0.20 WY -- ---'� --'� 0.24 1 1 I I I I 1 1 0.2z RunoffAtea==O4 00 at-�--- ------------------------------------- 02 Run;Qfi VQ1um(=OA20-4f_---- 018 Runoff Depth>2.35" J, 0.16 ° -MoW Lien tF1=375'--- , ---'-- - -` M 0.,4 - --J---'---L----L--1----- --L--J---�---L 0., -DNh44t---------t--------,-- o.08'-- - - - - -- L J L J---- - - - - - J 0.06 0.04 ' I L__1___I___L__J___I___1 Time (hours) --L--J---�---L--J---L--1-- -L--J---�---L--J---L--;-- ■ Runoff Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Hydrograph for Subcatchment 3S: Pre Unrouted Area Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.20 0.01 0.00 0.00 0.40 0.02 0.00 0.00 0.60 0.03 0.00 0.00 0.80 0.04 0.00 0.00 1.00 0.06 0.00 0.00 1.20 0.07 0.00 0.00 1.40 0.08 0.00 0.00 1.60 0.09 0.00 0.00 1.80 0.10 0.00 0.00 2.00 0.12 0.00 0.00 2.20 0.13 0.00 0.00 2.40 0.14 0.00 0.00 2.60 0.15 0.00 0.00 2.80 0.17 0.00 0.00 3.00 0.18 0.00 0.00 3.20 0.19 0.00 0.00 3.40 0.21 0.00 0.00 3.60 0.22 0.00 0.00 3.80 0.24 0.00 0.00 4.00 0.25 0.00 0.00 4.20 0.27 0.00 0.00 4.40 0.28 0.00 0.00 4.60 0.30 0.00 0.00 4.80 0.31 0.00 0.00 5.00 0.33 0.00 0.00 5.20 0.35 0.00 0.00 5.40 0.37 0.00 0.00 5.60 0.38 0.00 0.00 5.80 0.40 0.00 0.00 6.00 0.42 0.00 0.00 6.20 0.44 0.00 0.00 6.40 0.46 0.00 0.00 6.60 0.48 0.00 0.00 6.80 0.50 0.00 0.00 7.00 0.52 0.00 0.00 7.20 0.54 0.00 0.00 7.40 0.56 0.00 0.00 7.60 0.58 0.00 0.00 7.80 0.61 0.00 0.00 8.00 0.63 0.00 0.00 8.20 0.65 0.00 0.00 8.40 0.68 0.00 0.00 8.60 0.71 0.00 0.00 8.80 0.74 0.00 0.00 9.00 0.77 0.00 0.00 9.20 0.81 0.00 0.00 9.40 0.84 0.01 0.00 9.60 0.87 0.01 0.00 9.80 0.91 0.01 0.00 10.00 0.95 0.02 0.00 10.20 0.99 0.02 0.00 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 10.40 1.04 0.03 0.00 10.60 1.10 0.04 0.00 10.80 1.16 0.05 0.01 11.00 1.23 0.07 0.01 11.20 1.32 0.09 0.01 11.40 1.43 0.12 0.01 11.60 1.61 0.19 0.02 11.80 2.26 0.48 0.05 12.00 3.48 1.23 0.19 12.20 3.67 1.36 0.25 12.40 3.81 1.46 0.11 12.60 3.90 1.53 0.06 12.80 3.98 1.58 0.04 13.00 4.05 1.64 0.03 13.20 4.11 1.68 0.03 13.40 4.17 1.72 0.02 13.60 4.22 1.76 0.02 13.80 4.26 1.79 0.02 14.00 4.31 1.82 0.02 14.20 4.34 1.85 0.02 14.40 4.38 1.88 0.01 14.60 4.41 1.91 0.01 14.80 4.45 1.93 0.01 15.00 4.48 1.96 0.01 15.20 4.51 1.98 0.01 15.40 4.54 2.00 0.01 15.60 4.57 2.03 0.01 15.80 4.60 2.05 0.01 16.00 4.62 2.07 0.01 16.20 4.64 2.08 0.01 16.40 4.67 2.10 0.01 16.60 4.69 2.12 0.01 16.80 4.71 2.14 0.01 17.00 4.73 2.15 0.01 17.20 4.76 2.17 0.01 17.40 4.78 2.19 0.01 17.60 4.80 2.20 0.01 17.80 4.82 2.22 0.01 18.00 4.84 2.23 0.01 18.20 4.85 2.25 0.01 18.40 4.87 2.26 0.01 18.60 4.89 2.28 0.01 18.80 4.91 2.29 0.01 19.00 4.92 2.30 0.01 19.20 4.94 2.32 0.01 19.40 4.95 2.33 0.01 19.60 4.97 2.34 0.01 19.80 4.98 2.35 0.01 20.00 5.00 2.36 0.01 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Summary for Subcatchment 11S: Bioretention 1 Area Runoff = 7.52 cfs @ 11.96 hrs, Volume= 0.320 af, Depth> 2.98" Printed 5/28/2021 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Type II 24-hr 10 YR Rainfall=5.25 Area (ac) CN Description 0.400 98 Paved parking, HSG C 0.870 74 >75% Grass cover, Good, HSG C 0.020 77 Woods, Poor, HSG C 1.290 81 Weighted Average 0.890 68.99% Pervious Area 0.400 31.01% Impervious Area Tc Length Capacity Description 5.0 Direct Entry, Subcatchment 11S: Bioretention 1 Area Hydrograph r__r---r--r---r--r--r---r--T---r-- r- r -- r- 8 I I I I I I I I I 7$'11.T6 I I I I I I I Type II 24-hlr 7 10 YR Rainfall=5.25 rrl 6 Runoff Area=1.290 ac I I I I I I I I Runoff Volume=0.320 of -------------------------- 5 I I I I I I I I I I Runoff Depth>2.98" 4 Tc=5.0 min I I I I I 3 CN=81 I I I I I I I I I I I I I I I I I I I 2 I I I I I I I I I I I I I I I I I I I I 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoff Storm Caics-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Hydrograph for Subcatchment 11S: Bioretention 1 Area Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.20 0.01 0.00 0.00 0.40 0.02 0.00 0.00 0.60 0.03 0.00 0.00 0.80 0.04 0.00 0.00 1.00 0.06 0.00 0.00 1.20 0.07 0.00 0.00 1.40 0.08 0.00 0.00 1.60 0.09 0.00 0.00 1.80 0.10 0.00 0.00 2.00 0.12 0.00 0.00 2.20 0.13 0.00 0.00 2.40 0.14 0.00 0.00 2.60 0.15 0.00 0.00 2.80 0.17 0.00 0.00 3.00 0.18 0.00 0.00 3.20 0.19 0.00 0.00 3.40 0.21 0.00 0.00 3.60 0.22 0.00 0.00 3.80 0.24 0.00 0.00 4.00 0.25 0.00 0.00 4.20 0.27 0.00 0.00 4.40 0.28 0.00 0.00 4.60 0.30 0.00 0.00 4.80 0.31 0.00 0.00 5.00 0.33 0.00 0.00 5.20 0.35 0.00 0.00 5.40 0.37 0.00 0.00 5.60 0.38 0.00 0.00 5.80 0.40 0.00 0.00 6.00 0.42 0.00 0.00 6.20 0.44 0.00 0.00 6.40 0.46 0.00 0.00 6.60 0.48 0.00 0.00 6.80 0.50 0.00 0.00 7.00 0.52 0.00 0.00 7.20 0.54 0.00 0.01 7.40 0.56 0.00 0.01 7.60 0.58 0.01 0.01 7.80 0.61 0.01 0.01 8.00 0.63 0.01 0.02 8.20 0.65 0.01 0.02 8.40 0.68 0.02 0.03 8.60 0.71 0.02 0.03 8.80 0.74 0.03 0.04 9.00 0.77 0.03 0.04 9.20 0.81 0.04 0.05 9.40 0.84 0.05 0.05 9.60 0.87 0.06 0.06 9.80 0.91 0.07 0.07 10.00 0.95 0.08 0.08 10.20 0.99 0.10 0.10 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 10.40 1.04 0.11 0.11 10.60 1.10 0.13 0.13 10.80 1.16 0.16 0.16 11.00 1.23 0.19 0.20 11.20 1.32 0.23 0.26 11.40 1.43 0.28 0.34 11.60 1.61 0.37 0.68 11.80 2.26 0.78 2.82 12.00 3.48 1.69 6.39 12.20 3.67 1.85 0.98 12.40 3.81 1.96 0.72 12.60 3.90 2.04 0.50 12.80 3.98 2.11 0.43 13.00 4.05 2.17 0.37 13.20 4.11 2.22 0.33 13.40 4.17 2.26 0.30 13.60 4.22 2.31 0.27 13.80 4.26 2.35 0.25 14.00 4.31 2.38 0.23 14.20 4.34 2.41 0.21 14.40 4.38 2.44 0.20 14.60 4.41 2.47 0.20 14.80 4.45 2.50 0.19 15.00 4.48 2.53 0.18 15.20 4.51 2.56 0.17 15.40 4.54 2.58 0.16 15.60 4.57 2.61 0.16 15.80 4.60 2.63 0.15 16.00 4.62 2.65 0.14 16.20 4.64 2.67 0.13 16.40 4.67 2.69 0.13 16.60 4.69 2.71 0.13 16.80 4.71 2.73 0.13 17.00 4.73 2.75 0.12 17.20 4.76 2.77 0.12 17.40 4.78 2.79 0.12 17.60 4.80 2.81 0.11 17.80 4.82 2.82 0.11 18.00 4.84 2.84 0.11 18.20 4.85 2.86 0.11 18.40 4.87 2.87 0.10 18.60 4.89 2.89 0.10 18.80 4.91 2.90 0.10 19.00 4.92 2.92 0.09 19.20 4.94 2.93 0.09 19.40 4.95 2.95 0.09 19.60 4.97 2.96 0.09 19.80 4.98 2.97 0.08 20.00 5.00 2.98 0.08 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Printed 5/28/2021 Summary for Subcatchment 14S: Bioretention 2 Area Runoff = 6.40 cfs @ 11.96 hrs, Volume= 0.299 af, Depth> 4.08" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Type II 24-hr 10 YR Rainfall=5.25 Area (ac) CN Description 0.670 98 Paved parking, HSG C 0.160 74 >75% Grass cover, Good, HSG C 0.050 77 Woods, Poor, HSG C 0.880 92 Weighted Average 0.210 23.86% Pervious Area 0.670 76.14% Impervious Area Tc Length Capacity Description 5.0 Direct Entry, Subcatchment 14S: Bioretention 2 Area Hydrograph 6 Type II 24-hr 10 YR Rainfall=5.25" 5 Runoff Area=0.880 ac Runoff Volume=0.299 of 4—Runoff Depth>4.08" 3 Tc=5.0 min CN=92 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff Storm Caics-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Hydrograph for Subcatchment 14S: Bioretention 2 Area Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.20 0.01 0.00 0.00 0.40 0.02 0.00 0.00 0.60 0.03 0.00 0.00 0.80 0.04 0.00 0.00 1.00 0.06 0.00 0.00 1.20 0.07 0.00 0.00 1.40 0.08 0.00 0.00 1.60 0.09 0.00 0.00 1.80 0.10 0.00 0.00 2.00 0.12 0.00 0.00 2.20 0.13 0.00 0.00 2.40 0.14 0.00 0.00 2.60 0.15 0.00 0.00 2.80 0.17 0.00 0.00 3.00 0.18 0.00 0.00 3.20 0.19 0.00 0.00 3.40 0.21 0.00 0.00 3.60 0.22 0.00 0.01 3.80 0.24 0.00 0.01 4.00 0.25 0.01 0.01 4.20 0.27 0.01 0.01 4.40 0.28 0.01 0.01 4.60 0.30 0.02 0.02 4.80 0.31 0.02 0.02 5.00 0.33 0.02 0.02 5.20 0.35 0.03 0.02 5.40 0.37 0.03 0.02 5.60 0.38 0.04 0.03 5.80 0.40 0.05 0.03 6.00 0.42 0.05 0.03 6.20 0.44 0.06 0.03 6.40 0.46 0.07 0.04 6.60 0.48 0.08 0.04 6.80 0.50 0.09 0.04 7.00 0.52 0.10 0.04 7.20 0.54 0.11 0.05 7.40 0.56 0.12 0.05 7.60 0.58 0.13 0.05 7.80 0.61 0.14 0.05 8.00 0.63 0.16 0.06 8.20 0.65 0.17 0.06 8.40 0.68 0.19 0.07 8.60 0.71 0.20 0.08 8.80 0.74 0.22 0.09 9.00 0.77 0.24 0.09 9.20 0.81 0.27 0.10 9.40 0.84 0.29 0.10 9.60 0.87 0.31 0.10 9.80 0.91 0.34 0.12 10.00 0.95 0.37 0.13 10.20 0.99 0.40 0.15 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 10.40 1.04 0.44 0.17 10.60 1.10 0.48 0.19 10.80 1.16 0.53 0.22 11.00 1.23 0.58 0.25 11.20 1.32 0.65 0.32 11.40 1.43 0.74 0.40 11.60 1.61 0.90 0.75 11.80 2.26 1.47 2.74 12.00 3.48 2.62 5.33 12.20 3.67 2.80 0.79 12.40 3.81 2.93 0.57 12.60 3.90 3.02 0.39 12.80 3.98 3.10 0.34 13.00 4.05 3.17 0.29 13.20 4.11 3.23 0.26 13.40 4.17 3.28 0.23 13.60 4.22 3.33 0.21 13.80 4.26 3.37 0.19 14.00 4.31 3.41 0.17 14.20 4.34 3.45 0.16 14.40 4.38 3.49 0.16 14.60 4.41 3.52 0.15 14.80 4.45 3.55 0.14 15.00 4.48 3.58 0.14 15.20 4.51 3.61 0.13 15.40 4.54 3.64 0.13 15.60 4.57 3.67 0.12 15.80 4.60 3.69 0.11 16.00 4.62 3.72 0.11 16.20 4.64 3.74 0.10 16.40 4.67 3.76 0.10 16.60 4.69 3.79 0.10 16.80 4.71 3.81 0.10 17.00 4.73 3.83 0.09 17.20 4.76 3.85 0.09 17.40 4.78 3.87 0.09 17.60 4.80 3.89 0.09 17.80 4.82 3.91 0.08 18.00 4.84 3.93 0.08 18.20 4.85 3.95 0.08 18.40 4.87 3.96 0.08 18.60 4.89 3.98 0.08 18.80 4.91 4.00 0.07 19.00 4.92 4.01 0.07 19.20 4.94 4.03 0.07 19.40 4.95 4.05 0.07 19.60 4.97 4.06 0.06 19.80 4.98 4.07 0.06 20.00 5.00 4.09 0.06 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Printed 5/28/2021 Summary for Subcatchment 17S: Remaining Post SWM Facility Drainage Area Runoff = 9.36 cfs @ 12.09 hrs, Volume= 0.636 af, Depth> 3.86" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Type II 24-hr 10 YR Rainfall=5.25" Area (ac) CN Description 1.330 98 Paved parking, HSG C 0.650 74 >75% Grass cover, Good, HSG C 0.000 66 Woods, Poor, HSG B 1.980 90 Weighted Average 0.650 32.83% Pervious Area 1.330 67.17% Impervious Area Tc Length Slope Velocity Capacity Description 17.3 200 0.0450 0.19 Sheet Flow, Grass: Dense n= 0.240 P2= 3.47" 0.3 200 0.0200 9.68 11.88 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.010 PVC, smooth interior 17.6 400 Total Subcatchment 17S: Remaining Post SWM Facility Drainage Area Hydrograph ❑ Runoff 9 Type II 24-hr 8 10 YR Rainfall=5.25" Runoff Area=1.980 ac 7 Runoff Volume=0.636 of 6—Runoff Depth>3.86 - ° 5 Flow Length=4-00' III-- LL 4 Tc=17.6 min I I 3 CN=90 -------------L--J,---L 2 I I I I I I I I I I 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Caics-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Printed 5/28/2021 Hydrograph for Subcatchment 17S: Remaining Post SWM Facility Drainage Area Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.20 0.01 0.00 0.00 0.40 0.02 0.00 0.00 0.60 0.03 0.00 0.00 0.80 0.04 0.00 0.00 1.00 0.06 0.00 0.00 1.20 0.07 0.00 0.00 1.40 0.08 0.00 0.00 1.60 0.09 0.00 0.00 1.80 0.10 0.00 0.00 2.00 0.12 0.00 0.00 2.20 0.13 0.00 0.00 2.40 0.14 0.00 0.00 2.60 0.15 0.00 0.00 2.80 0.17 0.00 0.00 3.00 0.18 0.00 0.00 3.20 0.19 0.00 0.00 3.40 0.21 0.00 0.00 3.60 0.22 0.00 0.00 3.80 0.24 0.00 0.00 4.00 0.25 0.00 0.00 4.20 0.27 0.00 0.01 4.40 0.28 0.00 0.01 4.60 0.30 0.00 0.01 4.80 0.31 0.01 0.02 5.00 0.33 0.01 0.02 5.20 0.35 0.01 0.03 5.40 0.37 0.02 0.03 5.60 0.38 0.02 0.04 5.80 0.40 0.02 0.04 6.00 0.42 0.03 0.05 6.20 0.44 0.04 0.05 6.40 0.46 0.04 0.06 6.60 0.48 0.05 0.06 6.80 0.50 0.06 0.07 7.00 0.52 0.06 0.07 7.20 0.54 0.07 0.08 7.40 0.56 0.08 0.08 7.60 0.58 0.09 0.09 7.80 0.61 0.10 0.09 8.00 0.63 0.11 0.10 8.20 0.65 0.12 0.11 8.40 0.68 0.13 0.12 8.60 0.71 0.15 0.13 8.80 0.74 0.16 0.15 9.00 0.77 0.18 0.16 9.20 0.81 0.20 0.18 9.40 0.84 0.22 0.19 9.60 0.87 0.24 0.19 9.80 0.91 0.26 0.21 10.00 0.95 0.29 0.23 10.20 0.99 0.32 0.26 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 10.40 1.04 0.35 0.29 10.60 1.10 0.39 0.33 10.80 1.16 0.43 0.38 11.00 1.23 0.48 0.45 11.20 1.32 0.55 0.53 11.40 1.43 0.63 0.66 11.60 1.61 0.77 0.85 11.80 2.26 1.32 2.32 12.00 3.48 2.43 7.42 12.20 3.67 2.61 7.03 12.40 3.81 2.74 2.66 12.60 3.90 2.83 1.43 12.80 3.98 2.90 0.94 13.00 4.05 2.97 0.76 13.20 4.11 3.03 0.65 13.40 4.17 3.08 0.58 13.60 4.22 3.13 0.52 13.80 4.26 3.17 0.47 14.00 4.31 3.21 0.42 14.20 4.34 3.25 0.39 14.40 4.38 3.28 0.36 14.60 4.41 3.31 0.35 14.80 4.45 3.35 0.33 15.00 4.48 3.38 0.32 15.20 4.51 3.41 0.31 15.40 4.54 3.43 0.29 15.60 4.57 3.46 0.28 15.80 4.60 3.49 0.26 16.00 4.62 3.51 0.25 16.20 4.64 3.53 0.24 16.40 4.67 3.56 0.23 16.60 4.69 3.58 0.22 16.80 4.71 3.60 0.22 17.00 4.73 3.62 0.21 17.20 4.76 3.64 0.21 17.40 4.78 3.66 0.20 17.60 4.80 3.68 0.20 17.80 4.82 3.70 0.19 18.00 4.84 3.72 0.19 18.20 4.85 3.74 0.18 18.40 4.87 3.75 0.18 18.60 4.89 3.77 0.17 18.80 4.91 3.79 0.17 19.00 4.92 3.80 0.16 19.20 4.94 3.82 0.16 19.40 4.95 3.83 0.15 19.60 4.97 3.85 0.15 19.80 4.98 3.86 0.14 20.00 5.00 3.87 0.14 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Summary for Subcatchment 19S: Post Unrouted Area Runoff = 0.48 cfs @ 12.09 hrs, Volume= 0.033 af, Depth> 3.96" Printed 5/28/2021 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Type II 24-hr 10 YR Rainfall=5.25" Area (ac) CN Description 0.070 98 Paved parking, HSG C 0.030 74 >75% Grass cover, Good, HSG C 0.000 66 Woods, Poor, HSG B 0.100 91 Weighted Average 0.030 30.00% Pervious Area 0.070 70.00% Impervious Area Tc Length Slope Velocity Capacity Description 17.3 200 0.0450 0.19 Sheet Flow, Grass: Dense n= 0.240 P2= 3.47" 0.3 200 0.0200 9.68 11.88 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.010 PVC, smooth interior 17.6 400 Total Subcatchment 19S: Post Unrouted Area Hydrogreph I 0.5 o.1a Type ll' -I 0.45 �" 10 YR Rainfall=5.25" -;--- 1 0.4 _ Runoff Area=0.100 ac - 0.35 Runoff Volume=0.033af__�_--!_ 03 Runoff Depth>3.96"-___ 025 Flow Len t_h=_40.0_' 0.2 Tc=17.6 min' --,--- ;-- 0.15 C N=911 1 0.05 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (houm) ■ Runoff Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Hydrograph for Subcatchment 19S: Post Unrouted Area Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.20 0.01 0.00 0.00 0.40 0.02 0.00 0.00 0.60 0.03 0.00 0.00 0.80 0.04 0.00 0.00 1.00 0.06 0.00 0.00 1.20 0.07 0.00 0.00 1.40 0.08 0.00 0.00 1.60 0.09 0.00 0.00 1.80 0.10 0.00 0.00 2.00 0.12 0.00 0.00 2.20 0.13 0.00 0.00 2.40 0.14 0.00 0.00 2.60 0.15 0.00 0.00 2.80 0.17 0.00 0.00 3.00 0.18 0.00 0.00 3.20 0.19 0.00 0.00 3.40 0.21 0.00 0.00 3.60 0.22 0.00 0.00 3.80 0.24 0.00 0.00 4.00 0.25 0.00 0.00 4.20 0.27 0.00 0.00 4.40 0.28 0.01 0.00 4.60 0.30 0.01 0.00 4.80 0.31 0.01 0.00 5.00 0.33 0.02 0.00 5.20 0.35 0.02 0.00 5.40 0.37 0.02 0.00 5.60 0.38 0.03 0.00 5.80 0.40 0.03 0.00 6.00 0.42 0.04 0.00 6.20 0.44 0.05 0.00 6.40 0.46 0.05 0.00 6.60 0.48 0.06 0.00 6.80 0.50 0.07 0.00 7.00 0.52 0.08 0.00 7.20 0.54 0.09 0.00 7.40 0.56 0.10 0.00 7.60 0.58 0.11 0.01 7.80 0.61 0.12 0.01 8.00 0.63 0.13 0.01 8.20 0.65 0.14 0.01 8.40 0.68 0.16 0.01 8.60 0.71 0.17 0.01 8.80 0.74 0.19 0.01 9.00 0.77 0.21 0.01 9.20 0.81 0.23 0.01 9.40 0.84 0.25 0.01 9.60 0.87 0.27 0.01 9.80 0.91 0.30 0.01 10.00 0.95 0.33 0.01 10.20 0.99 0.36 0.01 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 10.40 1.04 0.39 0.02 10.60 1.10 0.43 0.02 10.80 1.16 0.48 0.02 11.00 1.23 0.53 0.02 11.20 1.32 0.60 0.03 11.40 1.43 0.68 0.03 11.60 1.61 0.83 0.04 11.80 2.26 1.40 0.12 12.00 3.48 2.52 0.38 12.20 3.67 2.70 0.36 12.40 3.81 2.83 0.14 12.60 3.90 2.92 0.07 12.80 3.98 3.00 0.05 13.00 4.05 3.07 0.04 13.20 4.11 3.13 0.03 13.40 4.17 3.18 0.03 13.60 4.22 3.23 0.03 13.80 4.26 3.27 0.02 14.00 4.31 3.31 0.02 14.20 4.34 3.35 0.02 14.40 4.38 3.38 0.02 14.60 4.41 3.42 0.02 14.80 4.45 3.45 0.02 15.00 4.48 3.48 0.02 15.20 4.51 3.51 0.02 15.40 4.54 3.54 0.01 15.60 4.57 3.56 0.01 15.80 4.60 3.59 0.01 16.00 4.62 3.61 0.01 16.20 4.64 3.64 0.01 16.40 4.67 3.66 0.01 16.60 4.69 3.68 0.01 16.80 4.71 3.70 0.01 17.00 4.73 3.72 0.01 17.20 4.76 3.74 0.01 17.40 4.78 3.77 0.01 17.60 4.80 3.78 0.01 17.80 4.82 3.80 0.01 18.00 4.84 3.82 0.01 18.20 4.85 3.84 0.01 18.40 4.87 3.86 0.01 18.60 4.89 3.87 0.01 18.80 4.91 3.89 0.01 19.00 4.92 3.91 0.01 19.20 4.94 3.92 0.01 19.40 4.95 3.94 0.01 19.60 4.97 3.95 0.01 19.80 4.98 3.97 0.01 20.00 5.00 3.98 0.01 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Summary for Pond 2P: EX SWM Facility [441 Hint: Outlet device #3 is below defined storage Printed 5/28/2021 Inflow Area = 4.150 ac, 38.07% Impervious, Inflow Depth > 3.15" for 10 YR event Inflow = 15.75 cfs @ 12.12 hrs, Volume= 1.090 of Outflow = 14.50 cfs @ 12.18 hrs, Volume= 1.085 af, Atten= 8%, Lag= 3.8 min Primary = 14.50 cfs @ 12.18 hrs, Volume= 1.085 of Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs / 3 Peak Elev= 393.37' @ 12.18 hrs Surf.Area= 3,812 sf Storage= 7,077 cf Plug -Flow detention time=11.7 min calculated for 1.085 of (100% of inflow) Center -of -Mass det. time= 9.8 min ( 791.2 - 781.4 ) Volume Invert Avail.Storage Storage Description #1 390.50' 15,349 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 390.50 1,556 0 0 391.00 1,802 840 840 392.00 2,409 2,106 2,945 393.00 3,226 2,818 5,763 394.00 4,794 4,010 9,773 395.00 6,358 5,576 15,349 Device Routing Invert Outlet Devices #1 Primary 390.05' 24.0" Round Culvert L= 53.0' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 390.05' / 389.69' S= 0.0068 '/' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean, Flow Area= 3.14 sf #2 Device 1 392.90' 24.0" x 24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 390.38' 12.0" Round Culvert L= 8.0' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 390.38' / 390.05' S= 0.0412 '/' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean, Flow Area= 0.79 sf Primary OutFlow Max=14.49 cfs @ 12.18 hrs HW=393.37' (Free Discharge) t1=Culvert (Passes 14.49 cfs of 23.06 cfs potential flow) �2=Orifice/Grate (Weir Controls 8.52 cfs @ 2.25 fps) 3=Culvert (Inlet Controls 5.97 cfs @ 7.60 fps) Storm Calcs-update 5-21-2021 Prepared by Timmons Grow Type 11 24-hr 10 YR Rainfall=5.25" Printed 5/28/2021 Pond 212: EX SWM Facility Hydrograph I I I I I I I I I I I I I I I I I I 1 ■Inflow 17 ' I 1 15.75 cfa Pnma ry L _tr' 1 re' = 5 a 15 , --1, --' —4 cfs Re f 37 _ _ ,4 ,,' -3 � r T—y I, ; ;; --r---1---1--T------r--i--1---r--T--1--T--,-- ;---r--------�-- -3to'lrage=7;1OT7 pf----r--�,- ,2 11 ---------------------------- 1 1 1 1 1 1 1 I I I 1 1 1 1 I I I 1p __1 g 1 1 1 1 1 I I I 3 _L _ I _L _L _J _L _L__ _L _J _I a_L Q LL 6 I I 1 1 1 1 1 1 1 1 1 1 1 I I I 5 , 1 1 1 1 I I 1 1 1 1 1 1 1 4 , ' I I 1 1 1 1 3 Time (hour) Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Hydrograph for Pond 2P: EX SWM Facility Time Inflow Storage Elevation Primary (hours) (cfs) (cubic -feet) (feet) (cfs) 0.00 0.00 0 390.50 0.00 0.50 0.00 0 390.50 0.00 1.00 0.00 0 390.50 0.00 1.50 0.00 0 390.50 0.00 2.00 0.00 0 390.50 0.00 2.50 0.00 0 390.50 0.00 3.00 0.00 0 390.50 0.00 3.50 0.00 0 390.50 0.00 4.00 0.00 0 390.50 0.00 4.50 0.00 0 390.50 0.00 5.00 0.00 0 390.50 0.00 5.50 0.00 0 390.50 0.00 6.00 0.00 0 390.50 0.00 6.50 0.01 4 390.50 0.01 7.00 0.03 15 390.51 0.02 7.50 0.05 27 390.52 0.05 8.00 0.07 40 390.53 0.07 8.50 0.11 57 390.54 0.09 9.00 0.16 87 390.56 0.13 9.50 0.21 137 390.59 0.18 10.00 0.27 183 390.62 0.23 10.50 0.39 262 390.66 0.33 11.00 0.60 384 390.74 0.51 11.50 1.05 594 390.86 0.88 12.00 11.15 3,516 392.23 4.39 12.50 4.08 5,467 392.91 5.42 13.00 1.51 1,847 391.51 3.01 13.50 1.07 763 390.96 1.21 14.00 0.83 601 390.87 0.90 14.50 0.69 509 390.81 0.73 15.00 0.63 464 390.78 0.65 15.50 0.56 425 390.76 0.58 16.00 0.49 384 390.74 0.52 16.50 0.44 347 390.72 0.46 17.00 0.42 327 390.70 0.43 17.50 0.39 311 390.69 0.40 18.00 0.37 295 390.68 0.38 18.50 0.35 278 390.67 0.36 19.00 0.32 260 390.66 0.33 19.50 0.30 242 390.65 0.31 20.00 0.27 224 390.64 0.28 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Summary for Pond 12P: Bioretention 1 Ponding Printed 5/28/2021 Inflow Area = 1.290 ac, 31.01 % Impervious, Inflow Depth > 2.98" for 10 YR event Inflow = 7.52 cfs @ 11.96 hrs, Volume= 0.320 of Outflow = 7.32 cfs @ 11.98 hrs, Volume= 0.305 af, Atten= 3%, Lag= 1.0 min Primary = 7.20 cfs @ 11.98 hrs, Volume= 0.209 of Secondary = 0.13 cfs @ 11.98 hrs, Volume= 0.096 of Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Peak Elev= 401.40' @ 11.98 hrs Surf.Area= 1,385 sf Storage= 1,383 cf Plug -Flow detention time= 28.2 min calculated for 0.305 of (95% of inflow) Center -of -Mass det. time= 10.4 min ( 784.6 - 774.3 ) Volume Invert Avail.Storage Storage Description #1 400.17' 2,580 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 400.17 870 0 0 402.17 1,710 2,580 2,580 Device Routing Invert Outlet Devices #1 Secondary 400.17' 4.000 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 1.00' #2 Primary 400.90' 24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=7.18 cfs @ 11.98 hrs HW=401.40' (Free Discharge) L2=Orif ice/G rate (Weir Controls 7.18 cfs @ 2.30 fps) $econdary OutFlow Max=0.13 cfs @ 11.98 hrs HW=401.40' (Free Discharge) 1=Exfiltration ( Controls 0.13 cfs) Storm Caics-update 5-21-2021 Prepared by Timmons Grow Type 11 24-hr 10 YR Rainfall=5.25" Printed 5/28/2021 Pond 12P: Bioretention 1 Ponding Hydrograph -lhfiilpw-Arft—ii .290-ac 6 -leek�-:iev=404 40' - tdr� je 9� 383cf' 6 e 4 3 0 1 2 3 4 5 6 7 8 9 10 11 Time (hours) NInflow 15z dr ---- NOutflow _ ■ Primary °�-------'--'- ■Secondary ------------------ ------------------ 5 16 17 Storm Caics-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Hydrograph for Pond 12P: Bioretention 1 Ponding Time Inflow Storage Elevation Outflow Primary Secondary (hours) (cfs) (cubic -feet) (feet) (cfs) (cfs) (cfs) 0.00 0.00 0 400.17 0.00 0.00 0.00 0.50 0.00 0 400.17 0.00 0.00 0.00 1.00 0.00 0 400.17 0.00 0.00 0.00 1.50 0.00 0 400.17 0.00 0.00 0.00 2.00 0.00 0 400.17 0.00 0.00 0.00 2.50 0.00 0 400.17 0.00 0.00 0.00 3.00 0.00 0 400.17 0.00 0.00 0.00 3.50 0.00 0 400.17 0.00 0.00 0.00 4.00 0.00 0 400.17 0.00 0.00 0.00 4.50 0.00 0 400.17 0.00 0.00 0.00 5.00 0.00 0 400.17 0.00 0.00 0.00 5.50 0.00 0 400.17 0.00 0.00 0.00 6.00 0.00 0 400.17 0.00 0.00 0.00 6.50 0.00 0 400.17 0.00 0.00 0.00 7.00 0.00 1 400.17 0.00 0.00 0.00 7.50 0.01 2 400.17 0.01 0.00 0.01 8.00 0.02 4 400.17 0.02 0.00 0.02 8.50 0.03 6 400.18 0.03 0.00 0.03 9.00 0.04 9 400.18 0.04 0.00 0.04 9.50 0.06 12 400.18 0.05 0.00 0.05 10.00 0.08 17 400.19 0.08 0.00 0.08 10.50 0.12 50 400.23 0.08 0.00 0.08 11.00 0.20 180 400.37 0.09 0.00 0.09 11.50 0.38 516 400.70 0.10 0.00 0.10 12.00 6.39 1,359 401.38 6.95 6.82 0.13 12.50 0.59 851 400.99 0.64 0.53 0.11 13.00 0.37 814 400.96 0.39 0.28 0.11 13.50 0.29 797 400.94 0.29 0.18 0.11 14.00 0.23 785 400.93 0.23 0.12 0.11 14.50 0.20 779 400.93 0.20 0.09 0.11 15.00 0.18 773 400.92 0.18 0.07 0.11 15.50 0.16 768 400.92 0.16 0.05 0.11 16.00 0.14 762 400.91 0.14 0.03 0.11 16.50 0.13 759 400.91 0.13 0.02 0.11 17.00 0.12 756 400.91 0.13 0.02 0.11 17.50 0.12 752 400.90 0.12 0.01 0.11 18.00 0.11 748 400.90 0.11 0.00 0.11 18.50 0.10 741 400.89 0.11 0.00 0.11 19.00 0.09 722 400.88 0.11 0.00 0.11 19.50 0.09 691 400.85 0.11 0.00 0.11 20.00 0.08 649 400.82 0.11 0.00 0.11 Printed 5/28/2021 Storm Caics-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Summary for Pond 13P: Bioretention 1 Media [441 Hint: Outlet device #1 is below defined storage Printed 5/28/2021 Inflow = 0.13 cfs @ 11.98 hrs, Volume= 0.096 of Outflow = 0.13 cfs @ 11.99 hrs, Volume= 0.096 af, Atten= 0%, Lag= 0.6 min Primary = 0.13 cfs @ 11.99 hrs, Volume= 0.096 of Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Peak Elev= 396.18' @ 11.99 hrs Surf.Area= 870 sf Storage= 5 cf Plug -Flow detention time= 0.6 min calculated for 0.096 of (100% of inflow) Center -of -Mass det. time= 0.3 min ( 876.8 - 876.5 ) Volume Invert Avail.Storage Storage Description #1 396.17' 1,131 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic -feet) (cubic -feet) 396.17 870 0.0 0 0 398.17 870 40.0 696 696 400.17 870 25.0 435 1,131 Device Routing Invert Outlet Devices #1 Primary 395.24' 4.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.37 cfs @ 11.99 hrs HW=396.18' (Free Discharge) t1=Orifice/Grate (Orifice Controls 0.37 cfs @ 4.24 fps) Storm Caics-update 5-21-2021 Prepared by Timmons Grow Type 11 24-hr 10 YR Rainfall=5.25" Printed 5/28/2021 Pond 1312: Bioretention 1 Media Hydrograph I I I I I I I ■ Inflow 0.14 ■Primary 0.13�h3 � 0.13 012 --Stprs e= 55,cf; ROMP 0.1 � --r-r--r __r__r__r___r I I I I I I I 0.09 I I I I I I I I I I I I I I I I I I I I i I I I I I I I I I I I .@ 0.08 I I I I I I I I I I I I I I c 0.07 __ � __-___i __r __ r __r___i __r __ r______ I I r I I I I I I I I I 0.06 I I I I I I I I I I I I I I I 0.05 ,'/ I I I I I I I I __ r __ �_ __r__r__r___i __r _____r--r--r--r--r--r--r---r--r-- I I I I I I I I I I I 0.04 I I I I I I I I I I I I I I I I 0.03 I I I I I I I I I I I I I I I I I I I I I I I I I 0.02 I I I I I I I i i i i I I I I I I i I I I I I I I I I I I I I 0.01 4 5 6 7 8 9 10 11 Time (hours) Storm Caics-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Hydrograph for Pond 13P: Bioretention 1 Media Time Inflow Storage Elevation Primary (hours) (cfs) (cubic -feet) (feet) (cfs) 0.00 0.00 0 396.17 0.00 0.50 0.00 0 396.17 0.00 1.00 0.00 0 396.17 0.00 1.50 0.00 0 396.17 0.00 2.00 0.00 0 396.17 0.00 2.50 0.00 0 396.17 0.00 3.00 0.00 0 396.17 0.00 3.50 0.00 0 396.17 0.00 4.00 0.00 0 396.17 0.00 4.50 0.00 0 396.17 0.00 5.00 0.00 0 396.17 0.00 5.50 0.00 0 396.17 0.00 6.00 0.00 0 396.17 0.00 6.50 0.00 0 396.17 0.00 7.00 0.00 0 396.17 0.00 7.50 0.01 0 396.17 0.01 8.00 0.02 1 396.17 0.02 8.50 0.03 1 396.17 0.03 9.00 0.04 2 396.17 0.04 9.50 0.05 2 396.18 0.05 10.00 0.08 3 396.18 0.08 10.50 0.08 3 396.18 0.08 11.00 0.09 3 396.18 0.09 11.50 0.10 4 396.18 0.10 12.00 0.13 5 396.18 0.13 12.50 0.11 4 396.18 0.11 13.00 0.11 4 396.18 0.11 13.50 0.11 4 396.18 0.11 14.00 0.11 4 396.18 0.11 14.50 0.11 4 396.18 0.11 15.00 0.11 4 396.18 0.11 15.50 0.11 4 396.18 0.11 16.00 0.11 4 396.18 0.11 16.50 0.11 4 396.18 0.11 17.00 0.11 4 396.18 0.11 17.50 0.11 4 396.18 0.11 18.00 0.11 4 396.18 0.11 18.50 0.11 4 396.18 0.11 19.00 0.11 4 396.18 0.11 19.50 0.11 4 396.18 0.11 20.00 0.11 4 396.18 0.11 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Summary for Pond 15P: Bioretention 2 Ponding Printed 5/28/2021 Inflow Area = 0.880 ac, 76.14% Impervious, Inflow Depth > 4.08" for 10 YR event Inflow = 6.40 cfs @ 11.96 hrs, Volume= 0.299 of Outflow = 5.90 cfs @ 11.99 hrs, Volume= 0.299 af, Atten= 8%, Lag= 1.7 min Primary = 5.69 cfs @ 11.99 hrs, Volume= 0.146 of Secondary = 0.21 cfs @ 11.99 hrs, Volume= 0.153 of Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Peak Elev= 400.01' @ 11.99 hrs Surf.Area= 2,285 sf Storage= 1,968 cf Plug -Flow detention time= 24.4 min calculated for 0.299 of (100% of inflow) Center -of -Mass det. time= 24.0 min ( 767.5 - 743.5 ) Volume Invert Avail.Storage Storage Description #1 399.00' 4,550 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 399.00 1,596 0 0 401.00 2,954 4,550 4,550 Device Routing Invert Outlet Devices #1 Secondary 399.00' 4.000 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 1.00' #2 Primary 399.50' 18.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=5.67 cfs @ 11.99 hrs HW=400.01' (Free Discharge) L2=Orif ice/G rate (Weir Controls 5.67 cfs @ 2.34 fps) $econdary OutFlow Max=0.21 cfs @ 11.99 hrs HW=400.01' (Free Discharge) 1=Exfiltration ( Controls 0.21 cfs) Storm Caics-update 5-21-2021 Prepared by Timmons Grow 0 LL Type 11 24-hr 10 YR Rainfall=5.25" Printed 5/28/2021 Pond 15P: Bioretention 2 Ponding Hydrograph -M Ow Are a-- 5.99 cfa Peak _kiev=400sbj' 69 h Stdrage'1P,968 TcfT 0 1 2 3 4 5 6 7 8 9 10 11 Time (hours) 5 16 17 Storm Caics-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Hydrograph for Pond 15P: Bioretention 2 Ponding Time Inflow Storage Elevation Outflow Primary Secondary (hours) (cfs) (cubic -feet) (feet) (cfs) (cfs) (cfs) 0.00 0.00 0 399.00 0.00 0.00 0.00 0.50 0.00 0 399.00 0.00 0.00 0.00 1.00 0.00 0 399.00 0.00 0.00 0.00 1.50 0.00 0 399.00 0.00 0.00 0.00 2.00 0.00 0 399.00 0.00 0.00 0.00 2.50 0.00 0 399.00 0.00 0.00 0.00 3.00 0.00 0 399.00 0.00 0.00 0.00 3.50 0.00 1 399.00 0.00 0.00 0.00 4.00 0.01 2 399.00 0.01 0.00 0.01 4.50 0.01 3 399.00 0.01 0.00 0.01 5.00 0.02 4 399.00 0.02 0.00 0.02 5.50 0.03 5 399.00 0.03 0.00 0.03 6.00 0.03 7 399.00 0.03 0.00 0.03 6.50 0.04 8 399.01 0.04 0.00 0.04 7.00 0.04 9 399.01 0.04 0.00 0.04 7.50 0.05 11 399.01 0.05 0.00 0.05 8.00 0.06 12 399.01 0.06 0.00 0.06 8.50 0.07 15 399.01 0.07 0.00 0.07 9.00 0.09 20 399.01 0.09 0.00 0.09 9.50 0.10 22 399.01 0.10 0.00 0.10 10.00 0.13 27 399.02 0.13 0.00 0.13 10.50 0.18 44 399.03 0.15 0.00 0.15 11.00 0.25 154 399.09 0.15 0.00 0.15 11.50 0.44 476 399.28 0.17 0.00 0.17 12.00 5.33 1,956 400.01 5.81 5.60 0.21 12.50 0.47 1,046 399.58 0.55 0.37 0.18 13.00 0.29 966 399.54 0.32 0.14 0.18 13.50 0.22 929 399.52 0.24 0.06 0.18 14.00 0.17 896 399.51 0.19 0.01 0.18 14.50 0.15 860 399.49 0.18 0.00 0.18 15.00 0.14 803 399.46 0.18 0.00 0.18 15.50 0.12 722 399.42 0.17 0.00 0.17 16.00 0.11 618 399.36 0.17 0.00 0.17 16.50 0.10 499 399.29 0.17 0.00 0.17 17.00 0.09 378 399.23 0.16 0.00 0.16 17.50 0.09 254 399.15 0.16 0.00 0.16 18.00 0.08 129 399.08 0.15 0.00 0.15 18.50 0.08 19 399.01 0.09 0.00 0.09 19.00 0.07 15 399.01 0.07 0.00 0.07 19.50 0.07 14 399.01 0.07 0.00 0.07 20.00 0.06 13 399.01 0.06 0.00 0.06 Printed 5/28/2021 Storm Caics-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Summary for Pond 16P: Bioretention 2 Media Printed 5/28/2021 Inflow = 0.21 cfs @ 11.99 hrs, Volume= 0.153 of Outflow = 0.21 cfs @ 12.04 hrs, Volume= 0.131 af, Atten= 2%, Lag= 3.5 min Primary = 0.21 cfs @ 12.04 hrs, Volume= 0.131 of Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Peak Elev= 395.42' @ 12.04 hrs Surf.Area= 1,500 sf Storage= 1,001 cf Plug -Flow detention time=111.5 min calculated for 0.131 of (86% of inflow) Center -of -Mass det. time= 61.6 min ( 868.9 - 807.2 ) Volume Invert Avail.Storage Storage Description #1 393.75' 2,419 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic -feet) (cubic -feet) 393.75 1,500 0.0 0 0 395.75 1,500 40.0 1,200 1,200 399.00 1,500 25.0 1,219 2,419 Device Routing Invert Outlet Devices #1 Primary 395.24' 4.0" Vert. Orifice/Grate X 3.00 C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.21 cfs @ 12.04 hrs HW=395.42' (Free Discharge) L1 =Orif ice/G rate (Orifice Controls 0.21 cfs @ 1.44 fps) Storm Caics-update 5-21-2021 Prepared by Timmons Grow Type 11 24-hr 10 YR Rainfall=5.25" Printed 5/28/2021 Pond 1612: Bioretention 2 Media Hydrograph --*-----1---r--+--r---1---r--*--r---r--*--�---1---r--*--�---1---r-- ■Inflow - 1 0.23 0.21 cfa __a___1___ ■Primary 'L 0.22 �,'. r osi �s Elavz/V 0.21 - ___. 0.2 .' ii�iQf� -- 0.2 19 .' A,+�tir42r 0.18--1---r-- 0.17016 I I I I I 0.15 T____ __ __ _ r__T__1 __I_ r__T__l___I_ r--T_ _r__T__ i___I___1 _r__ _ 0.14 0.13 I r__�___I___r__r__r___1___r__ I___r ._. 0.12 .' --1—_J--- I --- L__1__J___1--- L__ J___ L__ 1__'___1___L__ 1__J. ,' I 0 0.11 __T__----I___r__r__r___1___r_-�---r--*--y------ -r-- LL 01 ,, ' I 0.08_ __________I__I______ 11 0.07 0.06 1 __rr__r__r__ ___r_ r___r __r__-___I___r__r__r___1___r__ 0.05 ., __1—_J___I___L__1__ __I___L_ 1 1 1 1 1 1 L__ 0.04 ------ ___r__r__�___r--r--r--r---1---r-- ' , 1 1 I 1 1 1 0.02 nn1 , 4 5 6 7 8 9 10 11 Time (hours) Storm Caics-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Hydrograph for Pond 16P: Bioretention 2 Media Time Inflow Storage Elevation Primary (hours) (cfs) (cubic -feet) (feet) (cfs) 0.00 0.00 0 393.75 0.00 0.50 0.00 0 393.75 0.00 1.00 0.00 0 393.75 0.00 1.50 0.00 0 393.75 0.00 2.00 0.00 0 393.75 0.00 2.50 0.00 0 393.75 0.00 3.00 0.00 0 393.75 0.00 3.50 0.00 4 393.76 0.00 4.00 0.01 16 393.78 0.00 4.50 0.01 37 393.81 0.00 5.00 0.02 67 393.86 0.00 5.50 0.03 107 393.93 0.00 6.00 0.03 158 394.01 0.00 6.50 0.04 219 394.12 0.00 7.00 0.04 292 394.24 0.00 7.50 0.05 377 394.38 0.00 8.00 0.06 473 394.54 0.00 8.50 0.07 586 394.73 0.00 9.00 0.09 732 394.97 0.00 9.50 0.10 907 395.26 0.01 10.00 0.13 971 395.37 0.12 10.50 0.15 983 395.39 0.15 11.00 0.15 984 395.39 0.15 11.50 0.17 987 395.40 0.16 12.00 0.21 1,001 395.42 0.21 12.50 0.18 994 395.41 0.19 13.00 0.18 993 395.41 0.18 13.50 0.18 993 395.41 0.18 14.00 0.18 993 395.40 0.18 14.50 0.18 992 395.40 0.18 15.00 0.18 992 395.40 0.18 15.50 0.17 991 395.40 0.17 16.00 0.17 990 395.40 0.17 16.50 0.17 989 395.40 0.17 17.00 0.16 987 395.40 0.16 17.50 0.16 986 395.39 0.16 18.00 0.15 984 395.39 0.15 18.50 0.09 972 395.37 0.12 19.00 0.07 954 395.34 0.07 19.50 0.07 951 395.34 0.07 20.00 0.06 949 395.33 0.06 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Summary for Pond 18P: Modified SWM Facility [441 Hint: Outlet device #2 is below defined storage Printed 5/28/2021 Inflow Area = 4.150 ac, 57.83% Impervious, Inflow Depth > 3.52" for 10 YR event Inflow = 20.19 cfs @ 12.00 hrs, Volume= 1.219 of Outflow = 13.86 cfs @ 12.11 hrs, Volume= 1.206 af, Atten= 31 %, Lag= 6.7 min Primary = 13.86 cfs @ 12.11 hrs, Volume= 1.206 of Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs / 3 Peak Elev= 393.85' @ 12.11 hrs Surf.Area= 4,197 sf Storage= 12,207 cf Plug -Flow detention time= 28.0 min calculated for 1.206 of (99% of inflow) Center -of -Mass det. time= 23.7 min ( 797.9 - 774.2 ) Volume Invert Avail.Storage Storage Description #1 390.20' 17,357 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 390.20 2,498 0 0 395.00 4,734 17,357 17,357 Device Routing Invert Outlet Devices #1 Primary 390.19' 24.0" Round Culvert L= 52.0' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 390.19' / 389.65' S= 0.0104 '/' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean, Flow Area= 3.14 sf #2 Device 1 389.20' 7.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 392.40' 24.0" W x 18.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 393.90' 24.0" x 24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=13.85 cfs @ 12.11 hrs HW=393.85' (Free Discharge) t1=Culvert (Passes 13.85 cfs of 24.65 cfs potential flow) 2=Orifice/Grate (Orifice Controls 2.69 cfs @ 9.21 fps) 3=Orifice/Grate (Orifice Controls 11.17 cfs @ 3.86 fps) =Orifice/Grate ( Controls 0.00 cfs) Storm Calcs-update 5-21-2021 Prepared by Timmons Grow Type 11 24-hr 10 YR Rainfall=5.25" Printed 5/28/2021 Pond 1812: Modified Hydrograph SWM Facility --7---I—r--T-- i—�--r--1---Ir--T--;---li --t--l---I---r--�---I—r-- 1—_J___I__ 1 _I___L--L--1___I___1__J__ -___L--J---1___L__ ■Inflow 22 __'__---+--+__---`--+--J---+--+--m.leas __+--------+__+------+-- ■Pnmary 2, ,,,, Alrea=4150 a�-i--;- I 20 _IOfFia_v_v --i--;------i--------�-- ,9 18 ,''i Re �cy3 �I F r — 7 *[0 : 9 r —T —1 ----------- —T —1 — —r 17 ,6 _ 1__ I --- I_ 1_A I-- L__L__J L_-1__1_ -Siollrage^i-f 207-d---------- __1__J__— L__J--- L__ ----- -- --- --�------�-- --------T---I —I —T 1386 ch I I I I I I I .',' 13 __*_--I---r--T---I---r--*--r---r--- I __ __ ____ r--T---I---r-- r � I p 1.2 ____ ° 10 LL ',' 9 I I I I I I I I I I I I q 1 r__r__r___r__r__ I I 1 1 1 I 3 Time (hour) Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Hydrograph for Pond 18P: Modified SWM Facility Time Inflow Storage Elevation Primary (hours) (cfs) (cubic -feet) (feet) (cfs) 0.00 0.00 0 390.20 0.00 0.50 0.00 0 390.20 0.00 1.00 0.00 0 390.20 0.00 1.50 0.00 0 390.20 0.00 2.00 0.00 0 390.20 0.00 2.50 0.00 0 390.20 0.00 3.00 0.00 0 390.20 0.00 3.50 0.00 0 390.20 0.00 4.00 0.00 1 390.20 0.00 4.50 0.01 12 390.20 0.00 5.00 0.02 36 390.21 0.01 5.50 0.03 70 390.23 0.01 6.00 0.05 112 390.24 0.02 6.50 0.06 157 390.26 0.04 7.00 0.08 197 390.28 0.05 7.50 0.10 240 390.30 0.07 8.00 0.12 281 390.31 0.10 8.50 0.15 322 390.33 0.12 9.00 0.20 385 390.35 0.17 9.50 0.25 447 390.38 0.22 10.00 0.42 575 390.43 0.35 10.50 0.54 694 390.47 0.49 11.00 0.69 796 390.51 0.63 11.50 1.01 969 390.57 0.85 12.00 20.17 10,226 393.36 8.55 12.50 3.09 8,624 392.95 4.94 13.00 1.46 6,704 392.42 2.13 13.50 1.08 5,333 392.02 1.90 14.00 0.85 3,853 391.57 1.65 14.50 0.74 2,542 391.14 1.37 15.00 0.68 1,601 390.81 1.10 15.50 0.62 995 390.58 0.88 16.00 0.56 783 390.50 0.61 16.50 0.52 736 390.49 0.54 17.00 0.50 714 390.48 0.51 17.50 0.48 695 390.47 0.49 18.00 0.45 675 390.46 0.46 18.50 0.40 652 390.46 0.44 19.00 0.35 595 390.43 0.37 19.50 0.33 567 390.42 0.34 20.00 0.31 548 390.41 0.32 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25rr Printed 5/28/2021 Summary for Link 4L: Pre Analysis Point 1 Inflow Area = 4.250 ac, 37.18% Impervious, Inflow Depth > 3.12" for 10 YR event Inflow = 14.77 cfs @ 12.18 hrs, Volume= 1.105 of Primary = 14.77 cfs @ 12.18 hrs, Volume= 1.105 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Link 4L: Pre Analysis Point 1 Hydrograph I I I I I I I I I I I I I .n ,.Anflo Area=4 ac r___rr___r__r L__L-_LrrIIII __J��IIIIII __ - I __I--i__IiIIIII -___ L LrLrIIII __r--- 1___ r__r--- I___ r__r__r___ r__r__ 1 I I I I I I I I I I I I I I I I I I I I I I _ __II __ I I I I I I I I I I I I I I Time (hours) ❑ Inflow —111 ❑ Primary Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Hydrograph for Link 4L: Pre Analysis Point 1 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 0.20 0.00 0.00 0.00 0.40 0.00 0.00 0.00 0.60 0.00 0.00 0.00 0.80 0.00 0.00 0.00 1.00 0.00 0.00 0.00 1.20 0.00 0.00 0.00 1.40 0.00 0.00 0.00 1.60 0.00 0.00 0.00 1.80 0.00 0.00 0.00 2.00 0.00 0.00 0.00 2.20 0.00 0.00 0.00 2.40 0.00 0.00 0.00 2.60 0.00 0.00 0.00 2.80 0.00 0.00 0.00 3.00 0.00 0.00 0.00 3.20 0.00 0.00 0.00 3.40 0.00 0.00 0.00 3.60 0.00 0.00 0.00 3.80 0.00 0.00 0.00 4.00 0.00 0.00 0.00 4.20 0.00 0.00 0.00 4.40 0.00 0.00 0.00 4.60 0.00 0.00 0.00 4.80 0.00 0.00 0.00 5.00 0.00 0.00 0.00 5.20 0.00 0.00 0.00 5.40 0.00 0.00 0.00 5.60 0.00 0.00 0.00 5.80 0.00 0.00 0.00 6.00 0.00 0.00 0.00 6.20 0.00 0.00 0.00 6.40 0.00 0.00 0.00 6.60 0.01 0.00 0.01 6.80 0.02 0.00 0.02 7.00 0.02 0.00 0.02 7.20 0.03 0.00 0.03 7.40 0.04 0.00 0.04 7.60 0.05 0.00 0.05 7.80 0.06 0.00 0.06 8.00 0.07 0.00 0.07 8.20 0.08 0.00 0.08 8.40 0.09 0.00 0.09 8.60 0.10 0.00 0.10 8.80 0.12 0.00 0.12 9.00 0.13 0.00 0.13 9.20 0.15 0.00 0.15 9.40 0.17 0.00 0.17 9.60 0.19 0.00 0.19 9.80 0.21 0.00 0.21 10.00 0.24 0.00 0.24 10.20 0.27 0.00 0.27 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 10.40 0.31 0.00 0.31 10.60 0.37 0.00 0.37 10.80 0.43 0.00 0.43 11.00 0.52 0.00 0.52 11.20 0.63 0.00 0.63 11.40 0.79 0.00 0.79 11.60 1.02 0.00 1.02 11.80 1.90 0.00 1.90 12.00 4.58 0.00 4.58 12.20 14.58 0.00 14.58 12.40 7.29 0.00 7.29 12.60 5.17 0.00 5.17 12.80 4.24 0.00 4.24 13.00 3.04 0.00 3.04 13.20 1.92 0.00 1.92 13.40 1.37 0.00 1.37 13.60 1.15 0.00 1.15 13.80 1.01 0.00 1.01 14.00 0.91 0.00 0.91 14.20 0.83 0.00 0.83 14.40 0.77 0.00 0.77 14.60 0.72 0.00 0.72 14.80 0.69 0.00 0.69 15.00 0.66 0.00 0.66 15.20 0.63 0.00 0.63 15.40 0.61 0.00 0.61 15.60 0.58 0.00 0.58 15.80 0.55 0.00 0.55 16.00 0.53 0.00 0.53 16.20 0.50 0.00 0.50 16.40 0.48 0.00 0.48 16.60 0.46 0.00 0.46 16.80 0.45 0.00 0.45 17.00 0.44 0.00 0.44 17.20 0.43 0.00 0.43 17.40 0.42 0.00 0.42 17.60 0.41 0.00 0.41 17.80 0.40 0.00 0.40 18.00 0.39 0.00 0.39 18.20 0.38 0.00 0.38 18.40 0.37 0.00 0.37 18.60 0.36 0.00 0.36 18.80 0.35 0.00 0.35 19.00 0.34 0.00 0.34 19.20 0.33 0.00 0.33 19.40 0.32 0.00 0.32 19.60 0.31 0.00 0.31 19.80 0.30 0.00 0.30 20.00 0.29 0.00 0.29 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Printed 5/28/2021 Summary for Link 20L: Post Analysis Point 1 Inflow Area = 4.250 ac, 58.12% Impervious, Inflow Depth > 3.50" for 10 YR event Inflow = 14.34 cfs @ 12.11 hrs, Volume= 1.239 of Primary = 14.34 cfs @ 12.11 hrs, Volume= 1.239 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs 1 Link 20L: Post Analysis Point 1 Hydrograph i ' ___L___ ____J___I_ I I I I I/� I -_L__L___I___ L__ I I I I I I t630 ch 1 I'� 1 e /� I I I I I' f[ow Tr�=4--250- acL I I I I I I I I I I I I I I I I I I I I I I I I I i� I -7 -I -r -T -I __ _ _________I I I I I I I I I I I I I I I_____I I I I I I I I I _I__ _ _ I I I ,1 ___r__r__r___I___r__ I I I I I I I I I I I I I I 1 I I I i I I I Time (hour) ■ Inflow ■ Primary Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type II 24-hr 10 YR Rainfall=5.25" Hydrograph for Link 20L: Post Analysis Point 1 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 0.20 0.00 0.00 0.00 0.40 0.00 0.00 0.00 0.60 0.00 0.00 0.00 0.80 0.00 0.00 0.00 1.00 0.00 0.00 0.00 1.20 0.00 0.00 0.00 1.40 0.00 0.00 0.00 1.60 0.00 0.00 0.00 1.80 0.00 0.00 0.00 2.00 0.00 0.00 0.00 2.20 0.00 0.00 0.00 2.40 0.00 0.00 0.00 2.60 0.00 0.00 0.00 2.80 0.00 0.00 0.00 3.00 0.00 0.00 0.00 3.20 0.00 0.00 0.00 3.40 0.00 0.00 0.00 3.60 0.00 0.00 0.00 3.80 0.00 0.00 0.00 4.00 0.00 0.00 0.00 4.20 0.00 0.00 0.00 4.40 0.00 0.00 0.00 4.60 0.00 0.00 0.00 4.80 0.01 0.00 0.01 5.00 0.01 0.00 0.01 5.20 0.01 0.00 0.01 5.40 0.01 0.00 0.01 5.60 0.02 0.00 0.02 5.80 0.02 0.00 0.02 6.00 0.02 0.00 0.02 6.20 0.03 0.00 0.03 6.40 0.04 0.00 0.04 6.60 0.04 0.00 0.04 6.80 0.05 0.00 0.05 7.00 0.06 0.00 0.06 7.20 0.06 0.00 0.06 7.40 0.07 0.00 0.07 7.60 0.08 0.00 0.08 7.80 0.09 0.00 0.09 8.00 0.10 0.00 0.10 8.20 0.11 0.00 0.11 8.40 0.12 0.00 0.12 8.60 0.14 0.00 0.14 8.80 0.15 0.00 0.15 9.00 0.18 0.00 0.18 9.20 0.20 0.00 0.20 9.40 0.22 0.00 0.22 9.60 0.24 0.00 0.24 9.80 0.30 0.00 0.30 10.00 0.36 0.00 0.36 10.20 0.42 0.00 0.42 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 10.40 0.48 0.00 0.48 10.60 0.53 0.00 0.53 10.80 0.58 0.00 0.58 11.00 0.65 0.00 0.65 11.20 0.73 0.00 0.73 11.40 0.83 0.00 0.83 11.60 0.94 0.00 0.94 11.80 1.48 0.00 1.48 12.00 8.94 0.00 8.94 12.20 12.57 0.00 12.57 12.40 6.74 0.00 6.74 12.60 3.91 0.00 3.91 12.80 2.68 0.00 2.68 13.00 2.17 0.00 2.17 13.20 2.06 0.00 2.06 13.40 1.98 0.00 1.98 13.60 1.88 0.00 1.88 13.80 1.78 0.00 1.78 14.00 1.67 0.00 1.67 14.20 1.56 0.00 1.56 14.40 1.44 0.00 1.44 14.60 1.33 0.00 1.33 14.80 1.22 0.00 1.22 15.00 1.12 0.00 1.12 15.20 1.02 0.00 1.02 15.40 0.94 0.00 0.94 15.60 0.80 0.00 0.80 15.80 0.68 0.00 0.68 16.00 0.62 0.00 0.62 16.20 0.58 0.00 0.58 16.40 0.56 0.00 0.56 16.60 0.54 0.00 0.54 16.80 0.53 0.00 0.53 17.00 0.52 0.00 0.52 17.20 0.51 0.00 0.51 17.40 0.50 0.00 0.50 17.60 0.49 0.00 0.49 17.80 0.48 0.00 0.48 18.00 0.47 0.00 0.47 18.20 0.46 0.00 0.46 18.40 0.45 0.00 0.45 18.60 0.43 0.00 0.43 18.80 0.39 0.00 0.39 19.00 0.37 0.00 0.37 19.20 0.36 0.00 0.36 19.40 0.35 0.00 0.35 19.60 0.34 0.00 0.34 19.80 0.33 0.00 0.33 20.00 0.32 0.00 0.32 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Type 1124-hr 100 YR Rainfall=8.62" Prepared by Timmons Group Printed 5/28/2021 HydroCAD® 10.10-4a s/n 08663 © 2020 HydroCAD Software Solutions LLC Page 77 Time span=0.00-20.00 hrs, dt=0.01 hrs, 2001 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment1S: Pre SWM Facility Runoff Area=4.150 ac 38.07% Impervious Runoff Depth>6.14" Flow Length=375' Tc=19.7 min CN=83 Runoff=29.75 cfs 2.124 of Subcatchment3S: Pre Unrouted Area Runoff Area=0.100 ac 0.00% Impervious Runoff Depth>5.08" Flow Length=375' Tc=19.7 min CN=74 Runoff=0.61 cfs 0.042 of Subcatchment11S:BioretentionlArea Runoff Area=1.290ac 31.01%Impervious Runoff Depth>5.93" Tc=5.0 min CN=81 Runoff=14.29 cfs 0.637 of Subcatchment14S: Bioretention2 Area Runoff Area=0.880 ac 76.14% Impervious Runoff Depth>7.24" Tc=5.0 min CN=92 Runoff=10.90 cfs 0.531 of Subcatchment17S: Remaining Post SWM Runoff Area=1.980 ac 67.17% Impervious Runoff Depth>6.98" Flow Length=400' Tc=17.6 min CN=90 Runoff=16.33 cfs 1.151 of Subcatchment19S: Post Unrouted Area Runoff Area=0.100 ac 70.00% Impervious Runoff Depth >7.10" Flow Length=400' Tc=17.6 min CN=91 Runoff=0.83 cfs 0.059 of Pond 2P: EX SWM Facility Peak EIev=394.03' Storage=9,912 cf Inflow=29.75 cfs 2.124 of Outflow=26.11 cfs 2.115 of Pond 12P: Bioretention 1 Ponding Peak EIev=401.69' Storage=1,815 cf Inflow=14.29 cfs 0.637 of Primary=13.48 cfs 0.502 of Secondary=0.14 cfs 0.118 of Outflow=13.62 cfs 0.620 of Pond 13P: Bioretention1l Media Peak EIev=396.18' Storage=5 cf Inflow=0.14 cfs 0.118 of Outflow=0.14 cfs 0.118 of Pond 15P: Bioretention2 Ponding Peak EIev=400.45' Storage=3,020 cf Inflow=10.90 cfs 0.531 of Primary=8.28 cfs 0.320 of Secondary=0.24 cfs 0.203 of Outflow=8.52 cfs 0.522 of Pond 16P: Bioretention2 Media Peak EIev=395.43' Storage=1,008 cf Inflow=0.24 cfs 0.203 of Outflow=0.23 cfs 0.180 of Pond 18P: Modified SWM Facility Peak EIev=394.78' Storage=16,334 cf Inflow=35.06 cfs 2.271 of Outflow=28.67 cfs 2.254 of Link 4L: Pre Analysis Point 1 Inflow=26.66 cfs 2.158 of Primary=26.66 cfs 2.158 of Link 20L: Post Analysis Point 1 Inflow=29.50 cfs 2.313 of Primary=29.50 cfs 2.313 of Total Runoff Area = 8.500 ac Runoff Volume = 4.545 of Average Runoff Depth = 6.42" 52.35% Pervious = 4.450 ac 47.65% Impervious = 4.050 ac Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Printed 5/28/2021 Summary for Subcatchment 1S: Pre SWM Facility Drainage Area Runoff = 29.75 cfs @ 12.11 hrs, Volume= 2.124 af, Depth> 6.14" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Type II 24-hr 100 YR Rainfall=8.62" Area (ac) CN Description 1.580 98 Paved parking, HSG C 2.470 74 >75% Grass cover, Good, HSG C 0.100 66 Woods, Poor, HSG B 4.150 83 Weighted Average 2.570 61.93% Pervious Area 1.580 38.07% Impervious Area Tc Length Slope Velocity Capacity Description 17.3 200 0.0450 0.19 Sheet Flow, Grass: Dense n= 0.240 P2= 3.47" 2.4 175 0.0300 1.21 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 19.7 375 Total Subcatchment 1S: Pre SWM Facility Drainage Area Hydrograph i Type II 24-hir--- ---r-- r- 100 YR Rainfall=8.62" _ Runoff Area=4.150 ac Runoff Volume=2.124 of 18 Runoff Depth>6.14" E 14 Flow Length=375' Tc=19.7 min ---r-- 12 I I 10 ' CN=83 1 I I I I I I I ■Runoff 7-1 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 1 I I I I I I I I I I I I I I I I I 1 I I I IF 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Printed 5/28/2021 Hydrograph for Subcatchment 1S: Pre SWM Facility Drainage Area Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.20 0.02 0.00 0.00 0.40 0.04 0.00 0.00 0.60 0.05 0.00 0.00 0.80 0.07 0.00 0.00 1.00 0.09 0.00 0.00 1.20 0.11 0.00 0.00 1.40 0.13 0.00 0.00 1.60 0.15 0.00 0.00 1.80 0.17 0.00 0.00 2.00 0.19 0.00 0.00 2.20 0.21 0.00 0.00 2.40 0.23 0.00 0.00 2.60 0.25 0.00 0.00 2.80 0.28 0.00 0.00 3.00 0.30 0.00 0.00 3.20 0.32 0.00 0.00 3.40 0.34 0.00 0.00 3.60 0.37 0.00 0.00 3.80 0.39 0.00 0.00 4.00 0.41 0.00 0.00 4.20 0.44 0.00 0.00 4.40 0.46 0.00 0.01 4.60 0.49 0.00 0.02 4.80 0.52 0.01 0.03 5.00 0.54 0.01 0.05 5.20 0.57 0.01 0.06 5.40 0.60 0.02 0.08 5.60 0.63 0.02 0.09 5.80 0.66 0.03 0.11 6.00 0.69 0.03 0.12 6.20 0.72 0.04 0.14 6.40 0.75 0.05 0.15 6.60 0.79 0.06 0.17 6.80 0.82 0.07 0.19 7.00 0.85 0.08 0.21 7.20 0.89 0.09 0.22 7.40 0.92 0.10 0.24 7.60 0.96 0.12 0.26 7.80 1.00 0.13 0.28 8.00 1.03 0.15 0.30 8.20 1.07 0.16 0.32 8.40 1.12 0.18 0.35 8.60 1.16 0.20 0.40 8.80 1.21 0.23 0.44 9.00 1.27 0.25 0.50 9.20 1.32 0.28 0.55 9.40 1.38 0.31 0.59 9.60 1.43 0.34 0.61 9.80 1.49 0.38 0.65 10.00 1.56 0.41 0.72 10.20 1.63 0.46 0.81 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 10.40 1.71 0.51 0.92 10.60 1.81 0.57 1.05 10.80 1.91 0.63 1.21 11.00 2.03 0.71 1.42 11.20 2.17 0.81 1.68 11.40 2.34 0.94 2.09 11.60 2.64 1.17 2.67 11.80 3.71 2.04 6.64 12.00 5.72 3.83 21.74 12.20 6.02 4.11 25.51 12.40 6.25 4.32 10.54 12.60 6.41 4.47 5.52 12.80 6.54 4.60 3.51 13.00 6.65 4.70 2.68 13.20 6.75 4.80 2.27 13.40 6.85 4.88 2.00 13.60 6.93 4.96 1.79 13.80 7.00 5.03 1.62 14.00 7.07 5.09 1.47 14.20 7.13 5.15 1.34 14.40 7.19 5.21 1.25 14.60 7.25 5.26 1.19 14.80 7.30 5.32 1.14 15.00 7.36 5.37 1.10 15.20 7.41 5.41 1.05 15.40 7.46 5.46 1.00 15.60 7.50 5.50 0.96 15.80 7.54 5.54 0.91 16.00 7.59 5.58 0.86 16.20 7.62 5.62 0.81 16.40 7.66 5.66 0.79 16.60 7.70 5.69 0.76 16.80 7.74 5.73 0.75 17.00 7.77 5.76 0.73 17.20 7.81 5.79 0.71 17.40 7.84 5.83 0.70 17.60 7.88 5.86 0.68 17.80 7.91 5.89 0.66 18.00 7.94 5.92 0.65 18.20 7.97 5.95 0.63 18.40 8.00 5.98 0.61 18.60 8.03 6.00 0.59 18.80 8.06 6.03 0.58 19.00 8.08 6.06 0.56 19.20 8.11 6.08 0.54 19.40 8.14 6.11 0.53 19.60 8.16 6.13 0.51 19.80 8.18 6.15 0.49 20.00 8.21 6.17 0.47 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Summary for Subcatchment 3S: Pre Unrouted Area Runoff = 0.61 cfs @ 12.12 hrs, Volume= 0.042 af, Depth> 5.08" Printed 5/28/2021 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Type II 24-hr 100 YR Rainfall=8.62" Area (ac) CN Description 0.000 98 Paved parking, HSG C 0.100 74 >75% Grass cover, Good, HSG C 0.100 74 Weighted Average 0.100 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.3 200 0.0450 0.19 Sheet Flow, Grass: Dense n= 0.240 P2= 3.47" 2.4 175 0.0300 1.21 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fos 19.7 375 Total Subcatchment 3S: Pre Unrouted Area Hydrograph 0.65 ' 0.6 Type II 24-hr 0.55 100 YR Rainfall=8.62" 05 Runoff Area=0.100 ac 045 Runoff Volume=0.042 of 0.4 Runoff Depth>5.081 r--i---r 0.35 ° 1 Flow Length=375' -----,---' M 0.3 0.25 ' Tc=19.7 mim 02 _ '__ _ __ _4 _J _I _k 0.15 01 Time (hours) ■ Runoff Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Hydrograph for Subcatchment 3S: Pre Unrouted Area Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.20 0.02 0.00 0.00 0.40 0.04 0.00 0.00 0.60 0.05 0.00 0.00 0.80 0.07 0.00 0.00 1.00 0.09 0.00 0.00 1.20 0.11 0.00 0.00 1.40 0.13 0.00 0.00 1.60 0.15 0.00 0.00 1.80 0.17 0.00 0.00 2.00 0.19 0.00 0.00 2.20 0.21 0.00 0.00 2.40 0.23 0.00 0.00 2.60 0.25 0.00 0.00 2.80 0.28 0.00 0.00 3.00 0.30 0.00 0.00 3.20 0.32 0.00 0.00 3.40 0.34 0.00 0.00 3.60 0.37 0.00 0.00 3.80 0.39 0.00 0.00 4.00 0.41 0.00 0.00 4.20 0.44 0.00 0.00 4.40 0.46 0.00 0.00 4.60 0.49 0.00 0.00 4.80 0.52 0.00 0.00 5.00 0.54 0.00 0.00 5.20 0.57 0.00 0.00 5.40 0.60 0.00 0.00 5.60 0.63 0.00 0.00 5.80 0.66 0.00 0.00 6.00 0.69 0.00 0.00 6.20 0.72 0.00 0.00 6.40 0.75 0.00 0.00 6.60 0.79 0.00 0.00 6.80 0.82 0.00 0.00 7.00 0.85 0.01 0.00 7.20 0.89 0.01 0.00 7.40 0.92 0.01 0.00 7.60 0.96 0.02 0.00 7.80 1.00 0.02 0.00 8.00 1.03 0.03 0.00 8.20 1.07 0.04 0.00 8.40 1.12 0.04 0.00 8.60 1.16 0.05 0.00 8.80 1.21 0.06 0.00 9.00 1.27 0.08 0.01 9.20 1.32 0.09 0.01 9.40 1.38 0.11 0.01 9.60 1.43 0.13 0.01 9.80 1.49 0.15 0.01 10.00 1.56 0.17 0.01 10.20 1.63 0.19 0.01 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 10.40 1.71 0.23 0.01 10.60 1.81 0.26 0.02 10.80 1.91 0.31 0.02 11.00 2.03 0.36 0.02 11.20 2.17 0.43 0.03 11.40 2.34 0.52 0.04 11.60 2.64 0.69 0.05 11.80 3.71 1.39 0.12 12.00 5.72 2.95 0.43 12.20 6.02 3.20 0.53 12.40 6.25 3.40 0.22 12.60 6.41 3.53 0.12 12.80 6.54 3.64 0.08 13.00 6.65 3.74 0.06 13.20 6.75 3.83 0.05 13.40 6.85 3.91 0.04 13.60 6.93 3.98 0.04 13.80 7.00 4.04 0.04 14.00 7.07 4.10 0.03 14.20 7.13 4.16 0.03 14.40 7.19 4.21 0.03 14.60 7.25 4.26 0.03 14.80 7.30 4.31 0.03 15.00 7.36 4.36 0.02 15.20 7.41 4.40 0.02 15.40 7.46 4.44 0.02 15.60 7.50 4.48 0.02 15.80 7.54 4.52 0.02 16.00 7.59 4.56 0.02 16.20 7.62 4.59 0.02 16.40 7.66 4.63 0.02 16.60 7.70 4.66 0.02 16.80 7.74 4.69 0.02 17.00 7.77 4.72 0.02 17.20 7.81 4.75 0.02 17.40 7.84 4.78 0.02 17.60 7.88 4.81 0.02 17.80 7.91 4.84 0.01 18.00 7.94 4.87 0.01 18.20 7.97 4.90 0.01 18.40 8.00 4.93 0.01 18.60 8.03 4.95 0.01 18.80 8.06 4.98 0.01 19.00 8.08 5.00 0.01 19.20 8.11 5.02 0.01 19.40 8.14 5.05 0.01 19.60 8.16 5.07 0.01 19.80 8.18 5.09 0.01 20.00 8.21 5.11 0.01 Printed 5/28/2021 Storm Caics-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Summary for Subcatchment 11S: Bioretention 1 Area Runoff = 14.29 cfs @ 11.96 hrs, Volume= 0.637 af, Depth> 5.93" Printed 5/28/2021 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Type II 24-hr 100 YR Rainfall=8.62" Area (ac) CN Description 0.400 98 Paved parking, HSG C 0.870 74 >75% Grass cover, Good, HSG C 0.020 77 Woods, Poor, HSG C 1.290 81 Weighted Average 0.890 68.99% Pervious Area 0.400 31.01% Impervious Area Tc Length Capacity Description 5.0 Direct Entry, Subcatchment 11S: Bioretention 1 Area Hydrograph 14 TyRe-U.24hr,-- 13-100-YRRa1nfa11P8.f2''--, 12 I I I 1 1 I I I 1 1 I -RunofFArba=4.290ajt-L----- a Runaff VO1u�ne=0.¢37 af--;---I'r a" I I 11 1---I 1 1 o . T__ y-r---I r___I___r__1___I LL 7 c 'miin -1 1 1 _ 6 _C=8 11 1 1 L-----FF -- ----I- 1 1 I I I 1 1 I 5 1 1 1 1 1 1 4 1 1 1 1 1 1 3" 1 I 1 1 1 1 2' 1 1 I 1 1 _L _I _L _I _L _1 I I I I I I I I I 1 I I I I I I I I I r___I --- ------ r___I I �-- I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I ---I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Time (hours) ■ Runoff Storm Caics-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Hydrograph for Subcatchment 11S: Bioretention 1 Area Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.20 0.02 0.00 0.00 0.40 0.04 0.00 0.00 0.60 0.05 0.00 0.00 0.80 0.07 0.00 0.00 1.00 0.09 0.00 0.00 1.20 0.11 0.00 0.00 1.40 0.13 0.00 0.00 1.60 0.15 0.00 0.00 1.80 0.17 0.00 0.00 2.00 0.19 0.00 0.00 2.20 0.21 0.00 0.00 2.40 0.23 0.00 0.00 2.60 0.25 0.00 0.00 2.80 0.28 0.00 0.00 3.00 0.30 0.00 0.00 3.20 0.32 0.00 0.00 3.40 0.34 0.00 0.00 3.60 0.37 0.00 0.00 3.80 0.39 0.00 0.00 4.00 0.41 0.00 0.00 4.20 0.44 0.00 0.00 4.40 0.46 0.00 0.00 4.60 0.49 0.00 0.00 4.80 0.52 0.00 0.01 5.00 0.54 0.00 0.01 5.20 0.57 0.00 0.01 5.40 0.60 0.01 0.02 5.60 0.63 0.01 0.02 5.80 0.66 0.01 0.03 6.00 0.69 0.02 0.03 6.20 0.72 0.02 0.04 6.40 0.75 0.03 0.04 6.60 0.79 0.04 0.05 6.80 0.82 0.05 0.05 7.00 0.85 0.05 0.06 7.20 0.89 0.06 0.06 7.40 0.92 0.07 0.07 7.60 0.96 0.08 0.07 7.80 1.00 0.10 0.08 8.00 1.03 0.11 0.08 8.20 1.07 0.12 0.09 8.40 1.12 0.14 0.11 8.60 1.16 0.16 0.12 8.80 1.21 0.18 0.14 9.00 1.27 0.20 0.15 9.20 1.32 0.23 0.16 9.40 1.38 0.25 0.17 9.60 1.43 0.28 0.18 9.80 1.49 0.31 0.20 10.00 1.56 0.35 0.23 10.20 1.63 0.39 0.26 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 10.40 1.71 0.43 0.30 10.60 1.81 0.48 0.35 10.80 1.91 0.55 0.41 11.00 2.03 0.62 0.49 11.20 2.17 0.71 0.61 11.40 2.34 0.83 0.79 11.60 2.64 1.05 1.51 11.80 3.71 1.88 5.82 12.00 5.72 3.63 11.98 12.20 6.02 3.90 1.80 12.40 6.25 4.11 1.31 12.60 6.41 4.26 0.90 12.80 6.54 4.38 0.78 13.00 6.65 4.48 0.67 13.20 6.75 4.58 0.60 13.40 6.85 4.66 0.54 13.60 6.93 4.74 0.49 13.80 7.00 4.81 0.44 14.00 7.07 4.87 0.40 14.20 7.13 4.93 0.38 14.40 7.19 4.98 0.36 14.60 7.25 5.04 0.35 14.80 7.30 5.09 0.33 15.00 7.36 5.14 0.32 15.20 7.41 5.19 0.31 15.40 7.46 5.23 0.29 15.60 7.50 5.27 0.28 15.80 7.54 5.31 0.26 16.00 7.59 5.35 0.25 16.20 7.62 5.39 0.24 16.40 7.66 5.43 0.23 16.60 7.70 5.46 0.23 16.80 7.74 5.49 0.22 17.00 7.77 5.53 0.22 17.20 7.81 5.56 0.21 17.40 7.84 5.59 0.21 17.60 7.88 5.62 0.20 17.80 7.91 5.66 0.20 18.00 7.94 5.68 0.19 18.20 7.97 5.71 0.19 18.40 8.00 5.74 0.18 18.60 8.03 5.77 0.18 18.80 8.06 5.80 0.17 19.00 8.08 5.82 0.17 19.20 8.11 5.85 0.16 19.40 8.14 5.87 0.16 19.60 8.16 5.89 0.15 19.80 8.18 5.92 0.15 20.00 8.21 5.94 0.14 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Grow Type 11 24-hr 100 YR Rainfall=8.62" Printed 5/28/2021 Summary for Subcatchment 14S: Bioretention 2 Area Runoff = 10.90 cfs @ 11.96 hrs, Volume= 0.531 af, Depth> 7.24" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Type II 24-hr 100 YR Rainfall=8.62" Area (acl CN Descriotion 0.670 98 Paved parking, HSG C 0.160 74 >75% Grass cover, Good, HSG C 0.050 77 Woods, Poor, HSG C 0.880 92 Weighted Average 0.210 23.86% Pervious Area 0.670 76.14% Impervious Area Tc Length Description 5.0 Direct Entry, Subcatchment 14S: Bioretention 2 Area Hydrograph 12 --i---'I___'r__----r--i--� „ ype-u'24Lhr__ --I r I r I r--r--------- 10- A00-YR RainfW1;=BX2"' - 9 -aun'a#lAeea=D.88©ae.--- -Rundtf-Voluine=0.53f of --- -Runoff Depth>t.24" 3 g I I J I I I I °-T-C-46irnrtt-I r u 5 4 I I I I 3 2 1 I I I I I I I I I I J I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I --- L J _L _J--- L _J __ I I I I I I I I I I I I 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoff Storm Caics-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Hydrograph for Subcatchment 14S: Bioretention 2 Area Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.20 0.02 0.00 0.00 0.40 0.04 0.00 0.00 0.60 0.05 0.00 0.00 0.80 0.07 0.00 0.00 1.00 0.09 0.00 0.00 1.20 0.11 0.00 0.00 1.40 0.13 0.00 0.00 1.60 0.15 0.00 0.00 1.80 0.17 0.00 0.00 2.00 0.19 0.00 0.00 2.20 0.21 0.00 0.01 2.40 0.23 0.00 0.01 2.60 0.25 0.01 0.01 2.80 0.28 0.01 0.02 3.00 0.30 0.02 0.02 3.20 0.32 0.02 0.03 3.40 0.34 0.03 0.03 3.60 0.37 0.03 0.03 3.80 0.39 0.04 0.04 4.00 0.41 0.05 0.04 4.20 0.44 0.06 0.04 4.40 0.46 0.07 0.05 4.60 0.49 0.08 0.05 4.80 0.52 0.10 0.06 5.00 0.54 0.11 0.06 5.20 0.57 0.12 0.06 5.40 0.60 0.14 0.07 5.60 0.63 0.16 0.07 5.80 0.66 0.17 0.08 6.00 0.69 0.19 0.08 6.20 0.72 0.21 0.09 6.40 0.75 0.23 0.09 6.60 0.79 0.25 0.09 6.80 0.82 0.27 0.10 7.00 0.85 0.30 0.10 7.20 0.89 0.32 0.11 7.40 0.92 0.35 0.11 7.60 0.96 0.37 0.12 7.80 1.00 0.40 0.12 8.00 1.03 0.43 0.12 8.20 1.07 0.46 0.13 8.40 1.12 0.49 0.15 8.60 1.16 0.53 0.16 8.80 1.21 0.57 0.18 9.00 1.27 0.61 0.19 9.20 1.32 0.65 0.20 9.40 1.38 0.70 0.20 9.60 1.43 0.75 0.21 9.80 1.49 0.80 0.23 10.00 1.56 0.85 0.25 10.20 1.63 0.91 0.28 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 10.40 1.71 0.98 0.32 10.60 1.81 1.06 0.36 10.80 1.91 1.16 0.41 11.00 2.03 1.26 0.47 11.20 2.17 1.39 0.58 11.40 2.34 1.55 0.72 11.60 2.64 1.83 1.34 11.80 3.71 2.84 4.79 12.00 5.72 4.79 9.02 12.20 6.02 5.09 1.33 12.40 6.25 5.32 0.96 12.60 6.41 5.47 0.66 12.80 6.54 5.60 0.57 13.00 6.65 5.71 0.49 13.20 6.75 5.81 0.43 13.40 6.85 5.90 0.39 13.60 6.93 5.98 0.35 13.80 7.00 6.06 0.32 14.00 7.07 6.12 0.29 14.20 7.13 6.18 0.27 14.40 7.19 6.24 0.26 14.60 7.25 6.30 0.25 14.80 7.30 6.36 0.24 15.00 7.36 6.41 0.23 15.20 7.41 6.46 0.22 15.40 7.46 6.51 0.21 15.60 7.50 6.55 0.20 15.80 7.54 6.59 0.19 16.00 7.59 6.63 0.18 16.20 7.62 6.67 0.17 16.40 7.66 6.71 0.17 16.60 7.70 6.75 0.16 16.80 7.74 6.78 0.16 17.00 7.77 6.82 0.16 17.20 7.81 6.85 0.15 17.40 7.84 6.89 0.15 17.60 7.88 6.92 0.15 17.80 7.91 6.95 0.14 18.00 7.94 6.98 0.14 18.20 7.97 7.01 0.13 18.40 8.00 7.04 0.13 18.60 8.03 7.07 0.13 18.80 8.06 7.10 0.12 19.00 8.08 7.13 0.12 19.20 8.11 7.15 0.12 19.40 8.14 7.18 0.11 19.60 8.16 7.20 0.11 19.80 8.18 7.23 0.10 20.00 8.21 7.25 0.10 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Printed 5/28/2021 Summary for Subcatchment 17S: Remaining Post SWM Facility Drainage Area [471 Hint: Peak is 137% of capacity of segment #2 Runoff = 16.33 cfs @ 12.09 hrs, Volume= 1.151 af, Depth> 6.98" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Type II 24-hr 100 YR Rainfall=8.62" Area (ac) CN Description 1.330 98 Paved parking, HSG C 0.650 74 >75% Grass cover, Good, HSG C 0.000 66 Woods. Poor. HSG B 1.980 90 Weighted Average 0.650 32.83% Pervious Area 1.330 67.17% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.3 200 0.0450 0.19 Sheet Flow, Grass: Dense n= 0.240 P2= 3.47" 0.3 200 0.0200 9.68 11.88 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.010 PVC, smooth interior 17.6 400 Total Subcatchment 17S: Remaining Post SWM Facility Drainage Area 18 ----i_ ----------- --�----I--------I- ; ❑Runoff 17 18.93 Cs I I I 1 16 Type II 24-hr- 1 --- ----- 1 --,-- ---1 --114 --;---r--;---1r - 15 100 YR Rainfall) I 13 Runoff Area=1.980 ac --;---1 --II--- ------ -- ---1-- --- 12 Runoff Volume=1.151 of 11 - ---- -------------------------- N 10 Runoff Depth>6.98" ----- --- 1 ; - --r--,--- - --r ----r---1---r--,--- ° Flow Length=400' LL 8 I 1 I Tc- 7.V min --1 1 1 6. 11 1 1 1 1 1 1 1 U Q 4 I I 1 1 1 __J___L--1---L--1---I---L--J--_L__1---L I I 1 1 I I -I---1--J---L--J---L-_J___ 1 1 1 I 3 1 1 1 1 1 1 I 1 1 1 1 1 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Caics-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Printed 5/28/2021 Hydrograph for Subcatchment 17S: Remaining Post SWM Facility Drainage Area Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.20 0.02 0.00 0.00 0.40 0.04 0.00 0.00 0.60 0.05 0.00 0.00 0.80 0.07 0.00 0.00 1.00 0.09 0.00 0.00 1.20 0.11 0.00 0.00 1.40 0.13 0.00 0.00 1.60 0.15 0.00 0.00 1.80 0.17 0.00 0.00 2.00 0.19 0.00 0.00 2.20 0.21 0.00 0.00 2.40 0.23 0.00 0.00 2.60 0.25 0.00 0.00 2.80 0.28 0.00 0.01 3.00 0.30 0.00 0.02 3.20 0.32 0.01 0.02 3.40 0.34 0.01 0.03 3.60 0.37 0.02 0.04 3.80 0.39 0.02 0.05 4.00 0.41 0.03 0.06 4.20 0.44 0.04 0.06 4.40 0.46 0.04 0.07 4.60 0.49 0.05 0.08 4.80 0.52 0.06 0.09 5.00 0.54 0.07 0.10 5.20 0.57 0.08 0.11 5.40 0.60 0.10 0.12 5.60 0.63 0.11 0.12 5.80 0.66 0.12 0.13 6.00 0.69 0.14 0.14 6.20 0.72 0.15 0.15 6.40 0.75 0.17 0.16 6.60 0.79 0.19 0.17 6.80 0.82 0.21 0.18 7.00 0.85 0.23 0.19 7.20 0.89 0.25 0.20 7.40 0.92 0.27 0.21 7.60 0.96 0.29 0.22 7.80 1.00 0.32 0.23 8.00 1.03 0.34 0.24 8.20 1.07 0.37 0.25 8.40 1.12 0.40 0.27 8.60 1.16 0.43 0.30 8.80 1.21 0.47 0.33 9.00 1.27 0.51 0.36 9.20 1.32 0.55 0.39 9.40 1.38 0.59 0.41 9.60 1.43 0.63 0.42 9.80 1.49 0.68 0.44 10.00 1.56 0.73 0.48 10.20 1.63 0.79 0.53 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 10.40 1.71 0.86 0.60 10.60 1.81 0.93 0.67 10.80 1.91 1.02 0.76 11.00 2.03 1.12 0.88 11.20 2.17 1.24 1.03 11.40 2.34 1.39 1.27 11.60 2.64 1.66 1.60 11.80 3.71 2.65 4.27 12.00 5.72 4.57 13.12 12.20 6.02 4.87 12.17 12.40 6.25 5.09 4.56 12.60 6.41 5.24 2.44 12.80 6.54 5.37 1.60 13.00 6.65 5.48 1.28 13.20 6.75 5.58 1.10 13.40 6.85 5.67 0.97 13.60 6.93 5.75 0.87 13.80 7.00 5.82 0.79 14.00 7.07 5.89 0.72 14.20 7.13 5.95 0.65 14.40 7.19 6.01 0.61 14.60 7.25 6.07 0.59 14.80 7.30 6.12 0.56 15.00 7.36 6.17 0.54 15.20 7.41 6.22 0.52 15.40 7.46 6.27 0.49 15.60 7.50 6.32 0.47 15.80 7.54 6.36 0.44 16.00 7.59 6.40 0.42 16.20 7.62 6.44 0.40 16.40 7.66 6.47 0.38 16.60 7.70 6.51 0.38 16.80 7.74 6.55 0.37 17.00 7.77 6.58 0.36 17.20 7.81 6.62 0.35 17.40 7.84 6.65 0.34 17.60 7.88 6.68 0.33 17.80 7.91 6.71 0.32 18.00 7.94 6.75 0.32 18.20 7.97 6.78 0.31 18.40 8.00 6.80 0.30 18.60 8.03 6.83 0.29 18.80 8.06 6.86 0.28 19.00 8.08 6.89 0.27 19.20 8.11 6.91 0.27 19.40 8.14 6.94 0.26 19.60 8.16 6.96 0.25 19.80 8.18 6.99 0.24 20.00 8.21 7.01 0.23 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Summary for Subcatchment 19S: Post Unrouted Area Runoff = 0.83 cfs @ 12.09 hrs, Volume= 0.059 af, Depth> 7.10" Printed 5/28/2021 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Type II 24-hr 100 YR Rainfall=8.62" Area (ac) CN Description 0.070 98 Paved parking, HSG C 0.030 74 >75% Grass cover, Good, HSG C 0.000 66 Woods, Poor, HSG B 0.100 91 Weighted Average 0.030 30.00% Pervious Area 0.070 70.00% Impervious Area Tc Length Slope Velocity Capacity Description 17.3 200 0.0450 0.19 Sheet Flow, Grass: Dense n= 0.240 P2= 3.47" 0.3 200 0.0200 9.68 11.88 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.010 PVC, smooth interior 17.6 400 Total Subcatchment 19S: Post Unrouted Area Hydrograph �.n 0.85 Type II 24-hr-- 075 100 YR Rainfall=&AT 0.7 0.65 ------�--- ----------- Runoff Area=0.100 ac 06 0.55 ' Runoff Volume=0.059 of--'�, 0.5 ' Runoff Depth>7.10" ° 045 LL 0.4 Flow Len th=400' 0.35 - rC=47.6M1n`----_ -___`__�___�___i 0.25 _1\�91i�L--1__ �___L__�___�___i 0.2 0.15 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Hydrograph for Subcatchment 19S: Post Unrouted Area Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.20 0.02 0.00 0.00 0.40 0.04 0.00 0.00 0.60 0.05 0.00 0.00 0.80 0.07 0.00 0.00 1.00 0.09 0.00 0.00 1.20 0.11 0.00 0.00 1.40 0.13 0.00 0.00 1.60 0.15 0.00 0.00 1.80 0.17 0.00 0.00 2.00 0.19 0.00 0.00 2.20 0.21 0.00 0.00 2.40 0.23 0.00 0.00 2.60 0.25 0.00 0.00 2.80 0.28 0.01 0.00 3.00 0.30 0.01 0.00 3.20 0.32 0.01 0.00 3.40 0.34 0.02 0.00 3.60 0.37 0.02 0.00 3.80 0.39 0.03 0.00 4.00 0.41 0.04 0.00 4.20 0.44 0.05 0.00 4.40 0.46 0.06 0.00 4.60 0.49 0.07 0.00 4.80 0.52 0.08 0.01 5.00 0.54 0.09 0.01 5.20 0.57 0.10 0.01 5.40 0.60 0.12 0.01 5.60 0.63 0.13 0.01 5.80 0.66 0.15 0.01 6.00 0.69 0.16 0.01 6.20 0.72 0.18 0.01 6.40 0.75 0.20 0.01 6.60 0.79 0.22 0.01 6.80 0.82 0.24 0.01 7.00 0.85 0.26 0.01 7.20 0.89 0.28 0.01 7.40 0.92 0.31 0.01 7.60 0.96 0.33 0.01 7.80 1.00 0.36 0.01 8.00 1.03 0.38 0.01 8.20 1.07 0.41 0.01 8.40 1.12 0.44 0.01 8.60 1.16 0.48 0.02 8.80 1.21 0.51 0.02 9.00 1.27 0.56 0.02 9.20 1.32 0.60 0.02 9.40 1.38 0.64 0.02 9.60 1.43 0.69 0.02 9.80 1.49 0.74 0.02 10.00 1.56 0.79 0.03 10.20 1.63 0.85 0.03 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 10.40 1.71 0.92 0.03 10.60 1.81 0.99 0.03 10.80 1.91 1.08 0.04 11.00 2.03 1.19 0.05 11.20 2.17 1.31 0.05 11.40 2.34 1.47 0.07 11.60 2.64 1.74 0.08 11.80 3.71 2.74 0.22 12.00 5.72 4.68 0.67 12.20 6.02 4.98 0.62 12.40 6.25 5.20 0.23 12.60 6.41 5.36 0.12 12.80 6.54 5.49 0.08 13.00 6.65 5.60 0.07 13.20 6.75 5.70 0.06 13.40 6.85 5.79 0.05 13.60 6.93 5.87 0.04 13.80 7.00 5.94 0.04 14.00 7.07 6.01 0.04 14.20 7.13 6.07 0.03 14.40 7.19 6.13 0.03 14.60 7.25 6.18 0.03 14.80 7.30 6.24 0.03 15.00 7.36 6.29 0.03 15.20 7.41 6.34 0.03 15.40 7.46 6.39 0.02 15.60 7.50 6.43 0.02 15.80 7.54 6.48 0.02 16.00 7.59 6.52 0.02 16.20 7.62 6.55 0.02 16.40 7.66 6.59 0.02 16.60 7.70 6.63 0.02 16.80 7.74 6.67 0.02 17.00 7.77 6.70 0.02 17.20 7.81 6.73 0.02 17.40 7.84 6.77 0.02 17.60 7.88 6.80 0.02 17.80 7.91 6.83 0.02 18.00 7.94 6.86 0.02 18.20 7.97 6.89 0.02 18.40 8.00 6.92 0.02 18.60 8.03 6.95 0.01 18.80 8.06 6.98 0.01 19.00 8.08 7.01 0.01 19.20 8.11 7.03 0.01 19.40 8.14 7.06 0.01 19.60 8.16 7.08 0.01 19.80 8.18 7.11 0.01 20.00 8.21 7.13 0.01 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Summary for Pond 2P: EX SWM Facility [441 Hint: Outlet device #3 is below defined storage Printed 5/28/2021 Inflow Area = 4.150 ac, 38.07% Impervious, Inflow Depth > 6.14" for 100 YR event Inflow = 29.75 cfs @ 12.11 hrs, Volume= 2.124 of Outflow = 26.11 cfs @ 12.19 hrs, Volume= 2.115 af, Atten= 12%, Lag= 4.8 min Primary = 26.11 cfs @ 12.19 hrs, Volume= 2.115 of Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs / 3 Peak Elev= 394.03' @ 12.19 hrs Surf.Area= 4,839 sf Storage= 9,912 cf Plug -Flow detention time= 9.8 min calculated for 2.114 of (100% of inflow) Center -of -Mass det. time= 8.1 min ( 774.1 - 765.9 ) Volume Invert Avail.Storage Storage Description #1 390.50' 15,349 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 390.50 1,556 0 0 391.00 1,802 840 840 392.00 2,409 2,106 2,945 393.00 3,226 2,818 5,763 394.00 4,794 4,010 9,773 395.00 6,358 5,576 15,349 Device Routing Invert Outlet Devices #1 Primary 390.05' 24.0" Round Culvert L= 53.0' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 390.05' / 389.69' S= 0.0068 '/' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean, Flow Area= 3.14 sf #2 Device 1 392.90' 24.0" x 24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 390.38' 12.0" Round Culvert L= 8.0' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 390.38' / 390.05' S= 0.0412 '/' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean, Flow Area= 0.79 sf Primary OutFlow Max=26.11 cfs @ 12.19 hrs HW=394.03' (Free Discharge) t1=Culvert (Inlet Controls 26.11 cfs @ 8.31 fps) �2=Orifice/Grate (Passes < 20.46 cfs potential flow) 3=Culvert (Passes < 6.71 cfs potential flow) Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Printed 5/28/2021 Pond 2P: EX SWM Facility Hydrograph ■PInrflimowar _-i1I __ iI ___iII ___iI ___I ___II _-IF y30 r ;---inflow Area 415d a-r--;. ;--;-- 28 -4 - -+ -+ - a 2611Re 26 I I I I I I I I 24 A 6 �` QIr@9T2-rf ;---Ilr-- IIII 22 - --*--;--;---! --;---III---�-- I I I I I I I I I 20 ,- _ / 18 18 -- -- - LL 14 ' i I---I---I I I I I- I I I I I I I I I I I I I I I I I I 12 I I I I I I I I I I I 10 i I I I I I a i I I I I I I I I I I I I I I I I I I 7 8 9 10 11 Time (hoes) Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Hydrograph for Pond 2P: EX SWM Facility Time Inflow Storage Elevation Primary (hours) (cfs) (cubic -feet) (feet) (cfs) 0.00 0.00 0 390.50 0.00 0.50 0.00 0 390.50 0.00 1.00 0.00 0 390.50 0.00 1.50 0.00 0 390.50 0.00 2.00 0.00 0 390.50 0.00 2.50 0.00 0 390.50 0.00 3.00 0.00 0 390.50 0.00 3.50 0.00 0 390.50 0.00 4.00 0.00 0 390.50 0.00 4.50 0.01 5 390.50 0.01 5.00 0.05 22 390.51 0.04 5.50 0.08 43 390.53 0.07 6.00 0.12 65 390.54 0.11 6.50 0.16 96 390.56 0.14 7.00 0.21 137 390.59 0.18 7.50 0.25 179 390.61 0.23 8.00 0.30 219 390.64 0.28 8.50 0.37 264 390.67 0.34 9.00 0.50 342 390.71 0.45 9.50 0.60 418 390.76 0.57 10.00 0.72 475 390.79 0.67 10.50 0.98 601 390.86 0.90 11.00 1.42 797 390.98 1.28 11.50 2.35 1,164 391.18 2.03 12.00 21.74 7,208 393.41 15.48 12.50 7.41 6,227 393.14 8.75 13.00 2.68 3,652 392.28 4.47 13.50 1.89 1,438 391.32 2.51 14.00 1.47 945 391.06 1.59 14.50 1.22 791 390.97 1.27 15.00 1.10 721 390.93 1.13 15.50 0.98 662 390.90 1.01 16.00 0.86 600 390.86 0.90 16.50 0.77 546 390.83 0.79 17.00 0.73 518 390.82 0.74 17.50 0.69 495 390.80 0.70 18.00 0.65 470 390.79 0.66 18.50 0.60 446 390.77 0.62 19.00 0.56 421 390.76 0.57 19.50 0.52 394 390.74 0.53 20.00 0.47 368 390.73 0.49 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Summary for Pond 12P: Bioretention 1 Ponding Printed 5/28/2021 Inflow Area = 1.290 ac, 31.01 % Impervious, Inflow Depth > 5.93" for 100 YR event Inflow = 14.29 cfs @ 11.96 hrs, Volume= 0.637 of Outflow = 13.62 cfs @ 11.98 hrs, Volume= 0.620 af, Atten= 5%, Lag= 1.3 min Primary = 13.48 cfs @ 11.98 hrs, Volume= 0.502 of Secondary = 0.14 cfs @ 11.98 hrs, Volume= 0.118 of Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Peak Elev= 401.69' @ 11.98 hrs Surf.Area= 1,510 sf Storage= 1,815 cf Plug -Flow detention time=17.9 min calculated for 0.620 of (97% of inflow) Center -of -Mass det. time= 6.7 min ( 765.0 - 758.3 ) Volume Invert Avail.Storage Storage Description #1 400.17' 2,580 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 400.17 870 0 0 402.17 1,710 2,580 2,580 Device Routing Invert Outlet Devices #1 Secondary 400.17' 4.000 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 1.00' #2 Primary 400.90' 24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=13.48 cfs @ 11.98 hrs HW=401.69' (Free Discharge) L2=Orif ice/G rate (Orifice Controls 13.48 cfs @ 4.29 fps) $econdary OutFlow Max=0.14 cfs @ 11.98 hrs HW=401.69' (Free Discharge) 1=Exfiltration ( Controls 0.14 cfs) Storm Caics-update 5-21-2021 Prepared by Timmons Grow Type // 24-hr 100 YR Rainfall=8.62" Printed 5/28/2021 Pond 12P: Bioretention 1 Ponding Hydrograph I I I I I I I I I I S© a 16 131205 - - 14 =F - v 13 Storage='11ya1 cf 12 ,' � --r--r--r--,--r--,-- I 10 •' •' ,' 9 3: 6 3 _1 _J O 7 LL I I I I I I I I 6 I I I I I I I I 4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Storm Caics-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Hydrograph for Pond 12P: Bioretention 1 Ponding Time Inflow Storage Elevation Outflow Primary Secondary (hours) (cfs) (cubic -feet) (feet) (cfs) (cfs) (cfs) 0.00 0.00 0 400.17 0.00 0.00 0.00 0.50 0.00 0 400.17 0.00 0.00 0.00 1.00 0.00 0 400.17 0.00 0.00 0.00 1.50 0.00 0 400.17 0.00 0.00 0.00 2.00 0.00 0 400.17 0.00 0.00 0.00 2.50 0.00 0 400.17 0.00 0.00 0.00 3.00 0.00 0 400.17 0.00 0.00 0.00 3.50 0.00 0 400.17 0.00 0.00 0.00 4.00 0.00 0 400.17 0.00 0.00 0.00 4.50 0.00 0 400.17 0.00 0.00 0.00 5.00 0.01 2 400.17 0.01 0.00 0.01 5.50 0.02 4 400.17 0.02 0.00 0.02 6.00 0.03 6 400.18 0.03 0.00 0.03 6.50 0.04 9 400.18 0.04 0.00 0.04 7.00 0.06 12 400.18 0.06 0.00 0.06 7.50 0.07 15 400.19 0.07 0.00 0.07 8.00 0.08 18 400.19 0.08 0.00 0.08 8.50 0.11 47 400.22 0.08 0.00 0.08 9.00 0.15 134 400.32 0.09 0.00 0.09 9.50 0.17 270 400.46 0.09 0.00 0.09 10.00 0.23 454 400.64 0.10 0.00 0.10 10.50 0.32 759 400.91 0.13 0.02 0.11 11.00 0.49 827 400.97 0.47 0.36 0.11 11.50 0.88 877 401.01 0.84 0.73 0.11 12.00 11.98 1,766 401.66 13.35 13.21 0.14 12.50 1.08 911 401.04 1.14 1.03 0.11 13.00 0.67 858 400.99 0.69 0.58 0.11 13.50 0.51 835 400.97 0.52 0.41 0.11 14.00 0.40 818 400.96 0.41 0.30 0.11 14.50 0.36 809 400.95 0.36 0.25 0.11 15.00 0.32 803 400.95 0.32 0.21 0.11 15.50 0.28 796 400.94 0.29 0.18 0.11 16.00 0.25 789 400.94 0.25 0.14 0.11 16.50 0.23 785 400.93 0.23 0.12 0.11 17.00 0.22 783 400.93 0.22 0.11 0.11 17.50 0.21 780 400.93 0.21 0.10 0.11 18.00 0.19 776 400.92 0.19 0.08 0.11 18.50 0.18 773 400.92 0.18 0.07 0.11 19.00 0.17 769 400.92 0.17 0.06 0.11 19.50 0.15 766 400.92 0.16 0.05 0.11 20.00 0.14 762 400.91 0.14 0.03 0.11 Printed 5/28/2021 Storm Caics-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Summary for Pond 13P: Bioretention 1 Media [441 Hint: Outlet device #1 is below defined storage Printed 5/28/2021 Inflow = 0.14 cfs @ 11.98 hrs, Volume= 0.118 of Outflow = 0.14 cfs @ 11.99 hrs, Volume= 0.118 af, Atten= 0%, Lag= 0.5 min Primary = 0.14 cfs @ 11.99 hrs, Volume= 0.118 of Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Peak Elev= 396.18' @ 11.99 hrs Surf.Area= 870 sf Storage= 5 cf Plug -Flow detention time= 0.6 min calculated for 0.118 of (100% of inflow) Center -of -Mass det. time= 0.3 min ( 810.1 - 809.8 ) Volume Invert Avail.Storage Storage Description #1 396.17' 1,131 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic -feet) (cubic -feet) 396.17 870 0.0 0 0 398.17 870 40.0 696 696 400.17 870 25.0 435 1,131 Device Routing Invert Outlet Devices #1 Primary 395.24' 4.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.37 cfs @ 11.99 hrs HW=396.18' (Free Discharge) t1=Orifice/Grate (Orifice Controls 0.37 cfs @ 4.25 fps) Storm Caics-update 5-21-2021 Prepared by Timmons Grow Type 11 24-hr 100 YR Rainfall=8.62" Printed 5/28/2021 Pond 1312: Bioretention 1 Media Hydrograph rI�--TiI-----I_rI�-_-_ E TIM 0.15 rrPrimary y - y0.1 ,_ 0.14 - J9&18,JI 0.13 ---r--7---i-- - ___ 0.12 - Storiog,e=5,llcf---li--+--�,- ,L__1_ _ 011 I I I I I I I I I I I I r -T 0'1 I I I I I I I I I I I , I I I I I I I 0.09 ._. 0.08 I I I I I I I I I I I I I I I I I I ° LL 0.07 I I I I I I I I I I I I I I I I I i I 0.06 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 0.04 I I I _L J _I _L _1 _J _L _1 _J _I 0.03 0.02r_ __-___i I I I I I I I I I I I I I I I I I I 0.01 4 5 6 7 8 9 10 11 Time (hours) Storm Caics-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Hydrograph for Pond 13P: Bioretention 1 Media Time Inflow Storage Elevation Primary (hours) (cfs) (cubic -feet) (feet) (cfs) 0.00 0.00 0 396.17 0.00 0.50 0.00 0 396.17 0.00 1.00 0.00 0 396.17 0.00 1.50 0.00 0 396.17 0.00 2.00 0.00 0 396.17 0.00 2.50 0.00 0 396.17 0.00 3.00 0.00 0 396.17 0.00 3.50 0.00 0 396.17 0.00 4.00 0.00 0 396.17 0.00 4.50 0.00 0 396.17 0.00 5.00 0.01 0 396.17 0.01 5.50 0.02 1 396.17 0.02 6.00 0.03 1 396.17 0.03 6.50 0.04 2 396.17 0.04 7.00 0.06 2 396.18 0.05 7.50 0.07 3 396.18 0.07 8.00 0.08 3 396.18 0.08 8.50 0.08 3 396.18 0.08 9.00 0.09 3 396.18 0.09 9.50 0.09 3 396.18 0.09 10.00 0.10 4 396.18 0.10 10.50 0.11 4 396.18 0.11 11.00 0.11 4 396.18 0.11 11.50 0.11 4 396.18 0.11 12.00 0.14 5 396.18 0.14 12.50 0.11 4 396.18 0.11 13.00 0.11 4 396.18 0.11 13.50 0.11 4 396.18 0.11 14.00 0.11 4 396.18 0.11 14.50 0.11 4 396.18 0.11 15.00 0.11 4 396.18 0.11 15.50 0.11 4 396.18 0.11 16.00 0.11 4 396.18 0.11 16.50 0.11 4 396.18 0.11 17.00 0.11 4 396.18 0.11 17.50 0.11 4 396.18 0.11 18.00 0.11 4 396.18 0.11 18.50 0.11 4 396.18 0.11 19.00 0.11 4 396.18 0.11 19.50 0.11 4 396.18 0.11 20.00 0.11 4 396.18 0.11 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Summary for Pond 15P: Bioretention 2 Ponding Printed 5/28/2021 Inflow Area = 0.880 ac, 76.14% Impervious, Inflow Depth > 7.24" for 100 YR event Inflow = 10.90 cfs @ 11.96 hrs, Volume= 0.531 of Outflow = 8.52 cfs @ 12.01 hrs, Volume= 0.522 af, Atten= 22%, Lag= 3.0 min Primary = 8.28 cfs @ 12.01 hrs, Volume= 0.320 of Secondary = 0.24 cfs @ 12.01 hrs, Volume= 0.203 of Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Peak Elev= 400.45' @ 12.01 hrs Surf.Area= 2,579 sf Storage= 3,020 cf Plug -Flow detention time= 23.7 min calculated for 0.522 of (98% of inflow) Center -of -Mass det. time= 16.4 min ( 746.8 - 730.4 ) Volume Invert Avail.Storage Storage Description #1 399.00' 4,550 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 399.00 1,596 0 0 401.00 2,954 4,550 4,550 Device Routing Invert Outlet Devices #1 Secondary 399.00' 4.000 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 1.00' #2 Primary 399.50' 18.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=8.27 cfs @ 12.01 hrs HW=400.45' (Free Discharge) L2=Orif ice/G rate (Orifice Controls 8.27 cfs @ 4.68 fps) $econdary OutFlow Max=0.24 cfs @ 12.01 hrs HW=400.45' (Free Discharge) 1=Exfiltration ( Controls 0.24 cfs) Storm Caics-update 5-21-2021 Prepared by Timmons Grow Type 11 24-hr 100 YR Rainfall=8.62" Printed 5/28/2021 Pond 15P: Bioretention 2 Ponding Hydrograph I I I I I I I I I I 12 I I I I I I I I I I __L--L--L--1--1--1--1--1--�--�- 19.9 11 -Fleakl Elev=400;4 it 10 Stdra a=3' 020 cf 852cN L__L__ __1__ __1__1. 828 cf5 9 I I I I I I a I I I I I I I , 7 I I I I I I I r -T -T -T -T -T -7 O_I___I I__I__I__I__I I I u• 5 - I I--i I I I I 4 L__L__1__1__1__.II , I I I I I I 3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Time (hours) Storm Caics-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Hydrograph for Pond 15P: Bioretention 2 Ponding Time Inflow Storage Elevation Outflow Primary Secondary (hours) (cfs) (cubic -feet) (feet) (cfs) (cfs) (cfs) 0.00 0.00 0 399.00 0.00 0.00 0.00 0.50 0.00 0 399.00 0.00 0.00 0.00 1.00 0.00 0 399.00 0.00 0.00 0.00 1.50 0.00 0 399.00 0.00 0.00 0.00 2.00 0.00 0 399.00 0.00 0.00 0.00 2.50 0.01 2 399.00 0.01 0.00 0.01 3.00 0.02 4 399.00 0.02 0.00 0.02 3.50 0.03 6 399.00 0.03 0.00 0.03 4.00 0.04 8 399.01 0.04 0.00 0.04 4.50 0.05 10 399.01 0.05 0.00 0.05 5.00 0.06 13 399.01 0.06 0.00 0.06 5.50 0.07 15 399.01 0.07 0.00 0.07 6.00 0.08 17 399.01 0.08 0.00 0.08 6.50 0.09 20 399.01 0.09 0.00 0.09 7.00 0.10 22 399.01 0.10 0.00 0.10 7.50 0.11 24 399.02 0.11 0.00 0.11 8.00 0.12 26 399.02 0.12 0.00 0.12 8.50 0.15 32 399.02 0.15 0.00 0.15 9.00 0.19 74 399.05 0.15 0.00 0.15 9.50 0.20 157 399.10 0.15 0.00 0.15 10.00 0.25 278 399.17 0.16 0.00 0.16 10.50 0.33 510 399.30 0.17 0.00 0.17 11.00 0.47 914 399.52 0.22 0.03 0.18 11.50 0.79 1,097 399.61 0.74 0.55 0.19 12.00 9.02 3,015 400.44 8.51 8.27 0.24 12.50 0.79 1,138 399.63 0.90 0.71 0.19 13.00 0.49 1,037 399.58 0.52 0.34 0.18 13.50 0.37 994 399.56 0.39 0.21 0.18 14.00 0.29 962 399.54 0.31 0.13 0.18 14.50 0.26 941 399.53 0.26 0.08 0.18 15.00 0.23 928 399.52 0.24 0.06 0.18 15.50 0.20 914 399.52 0.22 0.03 0.18 16.00 0.18 892 399.50 0.19 0.01 0.18 16.50 0.17 873 399.49 0.18 0.00 0.18 17.00 0.16 842 399.48 0.18 0.00 0.18 17.50 0.15 796 399.45 0.18 0.00 0.18 18.00 0.14 736 399.42 0.17 0.00 0.17 18.50 0.13 664 399.38 0.17 0.00 0.17 19.00 0.12 579 399.34 0.17 0.00 0.17 19.50 0.11 483 399.29 0.17 0.00 0.17 20.00 0.10 376 399.22 0.16 0.00 0.16 Printed 5/28/2021 Storm Caics-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Summary for Pond 16P: Bioretention 2 Media Printed 5/28/2021 Inflow = 0.24 cfs @ 12.01 hrs, Volume= 0.203 of Outflow = 0.23 cfs @ 12.06 hrs, Volume= 0.180 af, Atten= 4%, Lag= 3.1 min Primary = 0.23 cfs @ 12.06 hrs, Volume= 0.180 of Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Peak Elev= 395.43' @ 12.06 hrs Surf.Area= 1,500 sf Storage= 1,008 cf Plug -Flow detention time=103.5 min calculated for 0.180 of (89% of inflow) Center -of -Mass det. time= 56.1 min ( 830.0 - 773.8 ) Volume Invert Avail.Storage Storage Description #1 393.75' 2,419 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic -feet) (cubic -feet) 393.75 1,500 0.0 0 0 395.75 1,500 40.0 1,200 1,200 399.00 1,500 25.0 1,219 2,419 Device Routing Invert Outlet Devices #1 Primary 395.24' 4.0" Vert. Orifice/Grate X 3.00 C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.23 cfs @ 12.06 hrs HW=395.43' (Free Discharge) L1 =Orif ice/G rate (Orifice Controls 0.23 cfs @ 1.49 fps) Storm Caics-update 5-21-2021 Prepared by Timmons Grow Type 11 24-hr 100 YR Rainfall=8.62" Printed 5/28/2021 Pond 1612: Bioretention 2 Media Hydrograph I I I I I I I I I I I I I I I I I ■ Inflow , I I I 0.28r_________r__■Prima ry 'w�, C 431 I I I I I I - , �i-ICYTa7l 0.24 fi I.- ---L- 1--J---1---L--1--J-- - --I -- 022 ro 0.2 IIIIIIIIII 0.18--T--,---r--r-Y--,---r--r--Y-- - - 1I I I I I I I I I �U o'--'--'----L--1--L---'- - '----------------L--1--L--.I `-' .1a --I 3 LL 01 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 0.08 r�_r __r__ __�'___r__r__�___�__r__�___I___r__r__�___i I I I I I I I I I I I I I I I I I I i i I I I I I I --I I I I I I I I I I I I I I 0.04 I I I I I I I I I I I I I I I I I I 0.02 4 5 6 7 8 9 10 11 Time (hours) Storm Caics-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Hydrograph for Pond 16P: Bioretention 2 Media Time Inflow Storage Elevation Primary (hours) (cfs) (cubic -feet) (feet) (cfs) 0.00 0.00 0 393.75 0.00 0.50 0.00 0 393.75 0.00 1.00 0.00 0 393.75 0.00 1.50 0.00 0 393.75 0.00 2.00 0.00 0 393.75 0.00 2.50 0.01 10 393.77 0.00 3.00 0.02 38 393.81 0.00 3.50 0.03 84 393.89 0.00 4.00 0.04 146 393.99 0.00 4.50 0.05 225 394.12 0.00 5.00 0.06 322 394.29 0.00 5.50 0.07 438 394.48 0.00 6.00 0.08 573 394.71 0.00 6.50 0.09 728 394.96 0.00 7.00 0.10 901 395.25 0.00 7.50 0.11 968 395.36 0.11 8.00 0.12 973 395.37 0.12 8.50 0.15 981 395.39 0.14 9.00 0.15 983 395.39 0.15 9.50 0.15 984 395.39 0.15 10.00 0.16 986 395.39 0.16 10.50 0.17 988 395.40 0.17 11.00 0.18 992 395.40 0.18 11.50 0.19 994 395.41 0.19 12.00 0.24 1,006 395.43 0.22 12.50 0.19 996 395.41 0.19 13.00 0.18 994 395.41 0.18 13.50 0.18 994 395.41 0.18 14.00 0.18 993 395.41 0.18 14.50 0.18 993 395.41 0.18 15.00 0.18 993 395.40 0.18 15.50 0.18 993 395.40 0.18 16.00 0.18 993 395.40 0.18 16.50 0.18 992 395.40 0.18 17.00 0.18 992 395.40 0.18 17.50 0.18 992 395.40 0.18 18.00 0.17 991 395.40 0.17 18.50 0.17 990 395.40 0.17 19.00 0.17 989 395.40 0.17 19.50 0.17 988 395.40 0.17 20.00 0.16 987 395.40 0.16 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Summary for Pond 18P: Modified SWM Facility [441 Hint: Outlet device #2 is below defined storage Printed 5/28/2021 Inflow Area = 4.150 ac, 57.83% Impervious, Inflow Depth > 6.57" for 100 YR event Inflow = 35.06 cfs @ 12.01 hrs, Volume= 2.271 of Outflow = 28.67 cfs @ 12.08 hrs, Volume= 2.254 af, Atten= 18%, Lag= 4.5 min Primary = 28.67 cfs @ 12.08 hrs, Volume= 2.254 of Routing by Stor-Ind method, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs / 3 Peak Elev= 394.78' @ 12.08 hrs Surf.Area= 4,632 sf Storage= 16,334 cf Plug -Flow detention time= 23.4 min calculated for 2.254 of (99% of inflow) Center -of -Mass det. time= 20.2 min ( 776.2 - 756.0 ) Volume Invert Avail.Storage Storage Description #1 390.20' 17,357 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 390.20 2,498 0 0 395.00 4,734 17,357 17,357 Device Routing Invert Outlet Devices #1 Primary 390.19' 24.0" Round Culvert L= 52.0' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 390.19' / 389.65' S= 0.0104 '/' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean, Flow Area= 3.14 sf #2 Device 1 389.20' 7.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 392.40' 24.0" W x 18.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 393.90' 24.0" x 24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=28.67 cfs @ 12.08 hrs HW=394.78' (Free Discharge) t1=Culvert (Inlet Controls 28.67 cfs @ 9.12 fps) 2=Orifice/Grate (Passes < 3.01 cfs potential flow) 3=Orifice/Grate (Passes < 18.28 cfs potential flow) =Orifice/Grate (Passes < 18.08 cfs potential flow) Storm Calcs-update 5-21-2021 Prepared by Timmons Grow Type 11 24-hr 100 YR Rainfall=8.62" Pond 1812: Modified SWM Facility Hydrograph I I 38 _ / n{'A`-,, /�� Ate__ _ 36 - nfj" -Area=4L _- 34 32 -Re l = 4:78' -II 1----I- 1-- - L--L--J L__Li- 28-Stgrage�a-,334-C#- , 26 .@ 24 22 20 0 18 16 14 / I 12 L__L__ 6 6 I I �I I� Time (hours) Printed 5/28/2021 ■ Inflow L=morl _r__-___i___r__-___i___r__ I I I I I I I I I I --I -- I---I---I--- I L--J--- I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I L__J___IL__ L-J I Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Hydrograph for Pond 18P: Modified SWM Facility Time Inflow Storage Elevation Primary (hours) (cfs) (cubic -feet) (feet) (cfs) 0.00 0.00 0 390.20 0.00 0.50 0.00 0 390.20 0.00 1.00 0.00 0 390.20 0.00 1.50 0.00 0 390.20 0.00 2.00 0.00 0 390.20 0.00 2.50 0.00 0 390.20 0.00 3.00 0.02 12 390.20 0.00 3.50 0.04 51 390.22 0.01 4.00 0.06 108 390.24 0.02 4.50 0.08 172 390.27 0.04 5.00 0.11 234 390.29 0.07 5.50 0.14 297 390.32 0.11 6.00 0.17 354 390.34 0.14 6.50 0.21 405 390.36 0.18 7.00 0.25 450 390.38 0.22 7.50 0.39 564 390.42 0.33 8.00 0.44 636 390.45 0.41 8.50 0.51 684 390.47 0.48 9.00 0.60 751 390.49 0.56 9.50 0.66 804 390.51 0.64 10.00 0.74 845 390.53 0.70 10.50 0.93 949 390.57 0.83 11.00 1.57 1,531 390.78 1.08 11.50 2.99 3,274 391.38 1.53 12.00 34.96 15,138 394.52 27.60 12.50 5.29 9,890 393.28 7.74 13.00 2.50 7,577 392.67 3.09 13.50 1.84 6,804 392.45 2.19 14.00 1.43 5,997 392.22 2.00 14.50 1.22 4,898 391.89 1.83 15.00 1.10 3,854 391.57 1.65 15.50 0.98 2,932 391.27 1.46 16.00 0.86 2,145 391.00 1.26 16.50 0.79 1,518 390.78 1.08 17.00 0.76 1,114 390.63 0.93 17.50 0.72 904 390.55 0.77 18.00 0.69 849 390.53 0.70 18.50 0.65 821 390.52 0.66 19.00 0.61 796 390.51 0.63 19.50 0.57 770 390.50 0.59 20.00 0.54 744 390.49 0.55 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Printed 5/28/2021 Summary for Link 4L: Pre Analysis Point 1 Inflow Area = 4.250 ac, 37.18% Impervious, Inflow Depth > 6.09" for 100 YR event Inflow = 26.66 cfs @ 12.19 hrs, Volume= 2.158 of Primary = 26.66 cfs @ 12.19 hrs, Volume= 2.158 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Link 4L: Pre Analysis Point 1 Hydrograph --,---_----*- -- - -- ----"---*--*--'---'---`--,-- '---+--+---'---*-- ■hd—o— I ,' I I I I i i i I I I zs ss cfs i i i I I I I ■Pnmary 26 ,'; _lnflp�eicAre�=_.2�q_aic _! _zsssd=------------I''---I'�-- 26 I I I I I I I I I I I 24 ,- I I I I I I I ----------------------------------- I I I I I I I I I I --------------------- I I I I 22 I I I I I I I I I I I I I 20 _I___ I I I I I I I I I I I I I I I I I I I ,' 18 I I I I I I I I I I I I I I I __-- �r--li __------r--r------r--r-- -r--------r------r--I -_ 16 I I I I I I I I I I I I 3 o 14 LL IIi___i II_ 12 II_i I I I II__I I I I I I I I I I I I I I I I I I 6 I Time (hours) Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Hydrograph for Link 4L: Pre Analysis Point 1 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 0.20 0.00 0.00 0.00 0.40 0.00 0.00 0.00 0.60 0.00 0.00 0.00 0.80 0.00 0.00 0.00 1.00 0.00 0.00 0.00 1.20 0.00 0.00 0.00 1.40 0.00 0.00 0.00 1.60 0.00 0.00 0.00 1.80 0.00 0.00 0.00 2.00 0.00 0.00 0.00 2.20 0.00 0.00 0.00 2.40 0.00 0.00 0.00 2.60 0.00 0.00 0.00 2.80 0.00 0.00 0.00 3.00 0.00 0.00 0.00 3.20 0.00 0.00 0.00 3.40 0.00 0.00 0.00 3.60 0.00 0.00 0.00 3.80 0.00 0.00 0.00 4.00 0.00 0.00 0.00 4.20 0.00 0.00 0.00 4.40 0.00 0.00 0.00 4.60 0.01 0.00 0.01 4.80 0.02 0.00 0.02 5.00 0.04 0.00 0.04 5.20 0.05 0.00 0.05 5.40 0.06 0.00 0.06 5.60 0.08 0.00 0.08 5.80 0.09 0.00 0.09 6.00 0.11 0.00 0.11 6.20 0.12 0.00 0.12 6.40 0.13 0.00 0.13 6.60 0.15 0.00 0.15 6.80 0.17 0.00 0.17 7.00 0.18 0.00 0.18 7.20 0.20 0.00 0.20 7.40 0.22 0.00 0.22 7.60 0.24 0.00 0.24 7.80 0.26 0.00 0.26 8.00 0.28 0.00 0.28 8.20 0.30 0.00 0.30 8.40 0.33 0.00 0.33 8.60 0.36 0.00 0.36 8.80 0.41 0.00 0.41 9.00 0.45 0.00 0.45 9.20 0.51 0.00 0.51 9.40 0.56 0.00 0.56 9.60 0.59 0.00 0.59 9.80 0.63 0.00 0.63 10.00 0.68 0.00 0.68 10.20 0.75 0.00 0.75 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 10.40 0.85 0.00 0.85 10.60 0.97 0.00 0.97 10.80 1.12 0.00 1.12 11.00 1.31 0.00 1.31 11.20 1.53 0.00 1.53 11.40 1.86 0.00 1.86 11.60 2.31 0.00 2.31 11.80 3.54 0.00 3.54 12.00 15.91 0.00 15.91 12.20 26.63 0.00 26.63 12.40 13.04 0.00 13.04 12.60 6.67 0.00 6.67 12.80 5.23 0.00 5.23 13.00 4.53 0.00 4.53 13.20 3.70 0.00 3.70 13.40 2.88 0.00 2.88 13.60 2.24 0.00 2.24 13.80 1.84 0.00 1.84 14.00 1.62 0.00 1.62 14.20 1.46 0.00 1.46 14.40 1.34 0.00 1.34 14.60 1.26 0.00 1.26 14.80 1.21 0.00 1.21 15.00 1.16 0.00 1.16 15.20 1.11 0.00 1.11 15.40 1.06 0.00 1.06 15.60 1.01 0.00 1.01 15.80 0.96 0.00 0.96 16.00 0.91 0.00 0.91 16.20 0.87 0.00 0.87 16.40 0.83 0.00 0.83 16.60 0.80 0.00 0.80 16.80 0.78 0.00 0.78 17.00 0.76 0.00 0.76 17.20 0.74 0.00 0.74 17.40 0.73 0.00 0.73 17.60 0.71 0.00 0.71 17.80 0.69 0.00 0.69 18.00 0.67 0.00 0.67 18.20 0.66 0.00 0.66 18.40 0.64 0.00 0.64 18.60 0.62 0.00 0.62 18.80 0.60 0.00 0.60 19.00 0.59 0.00 0.59 19.20 0.57 0.00 0.57 19.40 0.55 0.00 0.55 19.60 0.54 0.00 0.54 19.80 0.52 0.00 0.52 20.00 0.50 0.00 0.50 Printed 5/28/2021 Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Printed 5/28/2021 Summary for Link 20L: Post Analysis Point 1 Inflow Area = 4.250 ac, 58.12% Impervious, Inflow Depth > 6.53" for 100 YR event Inflow = 29.50 cfs @ 12.08 hrs, Volume= 2.313 of Primary = 29.50 cfs @ 12.08 hrs, Volume= 2.313 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-20.00 hrs, dt= 0.01 hrs Link 20L: Post Analysis Point 1 Hydrograph I I I __r___I___r__r__�__ I I I ---------------- I I I I I r__r__r__ I I I I I I I I I r__r__r__ I I I I I I I I I I Time (hours) I I I I I I I I I I I I I I -I V _II Il ❑ Inflow ❑ Primary Storm Calcs-update 5-21-2021 Prepared by Timmons Group Type 11 24-hr 100 YR Rainfall=8.62" Hydrograph for Link 20L: Post Analysis Point 1 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 0.20 0.00 0.00 0.00 0.40 0.00 0.00 0.00 0.60 0.00 0.00 0.00 0.80 0.00 0.00 0.00 1.00 0.00 0.00 0.00 1.20 0.00 0.00 0.00 1.40 0.00 0.00 0.00 1.60 0.00 0.00 0.00 1.80 0.00 0.00 0.00 2.00 0.00 0.00 0.00 2.20 0.00 0.00 0.00 2.40 0.00 0.00 0.00 2.60 0.00 0.00 0.00 2.80 0.00 0.00 0.00 3.00 0.00 0.00 0.00 3.20 0.01 0.00 0.01 3.40 0.01 0.00 0.01 3.60 0.01 0.00 0.01 3.80 0.02 0.00 0.02 4.00 0.02 0.00 0.02 4.20 0.03 0.00 0.03 4.40 0.04 0.00 0.04 4.60 0.05 0.00 0.05 4.80 0.06 0.00 0.06 5.00 0.07 0.00 0.07 5.20 0.09 0.00 0.09 5.40 0.11 0.00 0.11 5.60 0.12 0.00 0.12 5.80 0.14 0.00 0.14 6.00 0.15 0.00 0.15 6.20 0.17 0.00 0.17 6.40 0.18 0.00 0.18 6.60 0.20 0.00 0.20 6.80 0.22 0.00 0.22 7.00 0.23 0.00 0.23 7.20 0.26 0.00 0.26 7.40 0.32 0.00 0.32 7.60 0.37 0.00 0.37 7.80 0.40 0.00 0.40 8.00 0.43 0.00 0.43 8.20 0.45 0.00 0.45 8.40 0.47 0.00 0.47 8.60 0.51 0.00 0.51 8.80 0.54 0.00 0.54 9.00 0.58 0.00 0.58 9.20 0.62 0.00 0.62 9.40 0.65 0.00 0.65 9.60 0.67 0.00 0.67 9.80 0.69 0.00 0.69 10.00 0.72 0.00 0.72 10.20 0.77 0.00 0.77 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 10.40 0.83 0.00 0.83 10.60 0.93 0.00 0.93 10.80 1.02 0.00 1.02 11.00 1.13 0.00 1.13 11.20 1.28 0.00 1.28 11.40 1.49 0.00 1.49 11.60 1.73 0.00 1.73 11.80 4.00 0.00 4.00 12.00 28.27 0.00 28.27 12.20 23.42 0.00 23.42 12.40 10.56 0.00 10.56 12.60 6.10 0.00 6.10 12.80 4.08 0.00 4.08 13.00 3.16 0.00 3.16 13.20 2.66 0.00 2.66 13.40 2.35 0.00 2.35 13.60 2.15 0.00 2.15 13.80 2.09 0.00 2.09 14.00 2.04 0.00 2.04 14.20 1.97 0.00 1.97 14.40 1.90 0.00 1.90 14.60 1.83 0.00 1.83 14.80 1.75 0.00 1.75 15.00 1.68 0.00 1.68 15.20 1.60 0.00 1.60 15.40 1.52 0.00 1.52 15.60 1.44 0.00 1.44 15.80 1.36 0.00 1.36 16.00 1.28 0.00 1.28 16.20 1.21 0.00 1.21 16.40 1.13 0.00 1.13 16.60 1.06 0.00 1.06 16.80 1.00 0.00 1.00 17.00 0.95 0.00 0.95 17.20 0.90 0.00 0.90 17.40 0.82 0.00 0.82 17.60 0.77 0.00 0.77 17.80 0.74 0.00 0.74 18.00 0.72 0.00 0.72 18.20 0.70 0.00 0.70 18.40 0.69 0.00 0.69 18.60 0.67 0.00 0.67 18.80 0.66 0.00 0.66 19.00 0.64 0.00 0.64 19.20 0.62 0.00 0.62 19.40 0.61 0.00 0.61 19.60 0.59 0.00 0.59 19.80 0.58 0.00 0.58 20.00 0.56 0.00 0.56 Printed 5/28/2021 tlab inpntcells constant values calculation cells Project Name: Date: Scottsville Elementary School Addition 9/5/2019 Linear Development Project? No Site Information Post -Development Project (Treatment Volume and Loads) Enter Total Disturbed Area (acres) 3.04 Check: Eli Dest n S eci cationsist: L 2011 Stds & Specs a Pre-ReDevelopment Land Cover (acres) ®7 I Linear project? No Land cover areas entered correctly? Total disturbed area entered? A Soils BSoils CSoils DSells Totals Forest/Open Spare (acres) - undisturbed forest/open space 0.10 0.10 Managed Turt (acres)-tlisturbeQ graded far yards at other turf to be mowed/managed 2.47 2.47 Impervious Cater (acres) 0.47 0.47 3.04 Post -Development Land Cover (acres) A Soils BSoils CSoils DSoils Totals Forest/Open Spare (acres)-- undisturbed, protected ficarast/ii space or reforested land 0.07 0.07 Managed Turt (acres) disturbed, graded for ores or other turf to be mowed/manna ed Impervious Cover (acres) L 29 1.29 Area Check OK. OK. OR. OK. 3.04 'Forest/Open Spare areas must beprotectedin accordance with the Virginia RunoJJRetluction Methotl Constants Runoff Coefficients Rv Annual Rainfall (inches) 43 ASoils BSoils Csolls DSoils Target Rainfall Event (inches) 1.00 ForesVOpen Space 0.02 0.03 D.D4 0.05 Total Phosphorus [TP) EMC(mg/L) 0.26 Managed Turf 0.15 0.20 0.22 0.25 Total Nitrogen (TN) EMC(mg/L) 1.86 Impervious Cover 0.95 0.95 0.95 0.95 arget TP Load(lb/acre/yr) OAl Pj(unMess correction factor) 0.90 LAND COVER SUMMARY -- PRE-REDEVELOPMENTR COVER SUMMARY POST DEVELOPMENT LaMeoversummary-Pre Lard Coversummory-Post(Final) Land Cover Summary -Post Lardeover Summary -Post Pre-ReDetelopmend Dated Adjusted' Port ReDev. Is New Impervious Post-ReDevelapmem Paztorevelopmem New Impervious Forest/Open Space Cover (acres) 0.10 O.OJ Farest/Open Space Cover (acres) O.OJ Forest/Open Space Corner laterite) 01117 Weighted Rv(forest) 0.04 0.04 Weighted Rrdfimest) 0.04 Weighed Represent) 004 %Forest 3% 3% is Forest 2% %Forest 3% Managed Tuff Cover (acres) 2,47 1.68 Managed Turt Cover (acres) L68 Managerf Cover d Tu (acres) L68 Weighted Rv(turf) 0.22 0.22 Weighted Rv(turf) 0.22 Weighted RV mail 0.22 %Managetl Tuff 81% 76% its Managed Turf 55% %Managetl Turf 76% Impervious Cover(acoes) 0.47 0.47 Impervious Cover 1.29 ancientCot. Impervious m rvi us OA7 New Impervious Cover 0.82 Rv(impervious) 0.95 0.95 Rv(impervang) 0.95 "impervious) 0.95 Rv(imperviii 0.95 its Impervious 15% 21% %Impervious 42% % man rvious 21% Total Site Area (acres) 3.04 2.22 Final Site Area (acres) 3.04 Total Raney. Site Area (acres) 2 22 Site By o.33 0.37 Final Post Dear Site Be 0.53 ReDev Site go 037 Treatment Volume and Nutrient Load Treatment Volume and Nutrient Load Final Post- Pre-ReDevelopment Treatment Volume 0.0828 0.0682 Development 0.1332 (acre-ft) Treatment Volume (acre-R) FinalPast- Pre-ReDetelopment Treatment Volume 3,608 2,973 Development 5,800 (cubic feet) Treatment Volume (cubic feet) Pre-ReOevelopment TP Load Final Post- 2.27 1.87 Development TP Load 3.64 (Ib/yr) IIb/vrl PreNe�velopment TP Luatl per acre Final Paid Development TP (Ib/acre/yr) 0.75 08t Lord per arm 120 (elauefa) Baseline TP Load (lb/yr) (0A1lbs/acre/yr applied to pre- redevelopment area excluding pervious 0.91 land p spared fur new impervious cover) Port-Reoevelopmem Treatment Volume 01 (acri Port-Reoevelopmem Treatment Volume 2,973 (reNa read) Port-ReDevelopmem Load [TP) 1.87 (lb/yr)a Part-Relivievelopment TP Load per acre (lb/aue/yr) Max. Reduction wean uired (Below Pre- zM6 Roevelopment Load) Port4levelopment Treatment Volume 0 (acre-R) Post-Developmem Treatment Volume (cubic tent) Post-Develolmlem TP Lwtl pb/M 'Adjusted Land Cover Summary: Pre ReOeveloporeat land coverminus pervious land covn,j resi/open spore or Raged turf) acreage r acreage ropmeanew impervious rover. TP Load Reduction Required for Redeveloped Area (lb/yr) 0.37 TP Wad Reduction Required for New Impervious Area (Ib/yr) 1.4A Adjusted total acreage is consistent with PosaReDevelopment acreage humus aceage )new impervious cover). Column I shows mad reduction requriementf rnew impervious Cover (based on new development mad limit 0..41 Ihs/acr /year/. +ost-uevelopment Requirement for bite Are