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Home My WebLink AboutWPO202000007 Calculations 2021-04-06 (2)HARK VINEYARDS ALBEMARLE COUNTY, VIRGINIA WHITE HALL DISTRICT DESIGN CALCULATIONS & NARRATIVE WPO 2020-00007 FEBRUARY 5, 2021 REVISED: APRIL 6, 2021 s s • 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 ITfb-IN K SHOULTER v I.Ic. No. 0402057151 04/06/202 I �ss�r).% A I I�. 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 2.4 LD269 Culvert Report 3 Pre and Post Developed HydroCAD Calculations 4 Virginia Runoff Reduction Method Worksheet Summary Project Narrative: This project included a new tasting room for Hark Vineyards, a parking lot, septic field, and associated site work. The limits of disturbance is 4.88 acres. Water Ouality The current site is a vacant parcel that is mostly and open mowed field sloping southwest with some wooded low areas. 4.88 acres of disturbed area was analyzed for water quality. The site will require 1.59 lb./year to be treated. The required 1.591b./ year will be satisfied through the purchase of nutrient credits from a DEQ approved credit bank. Water Ouantity In the developed condition a portion of the runoff from the disturbed area will flow off of the site as sheet flow as it does in the existing condition. The remaining portion of the site will be routed to a 72" CMP storage system being proposed to detain the increase in flow. The CMP storage system detains the post developed 1-year storm to meet the energy balance equation and reduces the post -developed 10-year 24-hour storm to be less than the pre -developed 10-year 24-hour storm. FORM LD' STOBMWATEH INLET COMYNTATIONS SHEET OF LID IDC PROJECT HARK VINEYARD DESIGNER: A.MABEE DATE MfiY CHECKED: DNDS ENGLISH mmm�mmmomommmmmmmmmmmmmmmmmmmmmm�m mmm�mmm0000mmmmmmmmmmmmmmmmmmmmmm�m mmm�mmmmmmm®®mmmmmmmmmmmommmmmmmm�m� ®�m�mm�mmmmmmmmmmmmmmmmmmmmmmmmmm�m mmm�mmmomommmmmmmmmmmmmmmmmmmmmm�m mmm�mmm0000mmmmmmmmmmmmmmmmmmmmmm�m mmm�mmmmmmm®®mmmmmmmmmmmomm®mmmmm®mom m�®�mmmmmmmmmmmmmmmmmmmmmmmmmmmmm�m� mmmmm®omommmmmmmmmmmmmmmmmmmmmm�m� mmmmmmmmmommmmmmmmmmmmmmmmmmmmmmmmm■mom mmmm■mmmmmmmm®mm®mmmmmmmmmmm®mmmmm®mom ®mmm■mmmmmmmmmmmmmmmmmmmmmmmmmmmmmm■mom mmm�mmmo®mmmmmmmmmmmmmmmmmmmmmmmm■m mmmmmmmmmommmmmmmmmmmmmmmmmmmmmmmmm■mom mmmmmmmmmmmm®®mmmmmmmmmmmmmm®mmmmmm■m� ®�®m■mmmmmmmmmmmmmmmmmmmmmmmmmmmmmm■mom mmm�mmmommmmmmmmmmmmmmmmmmmmmmmmm■mom mmmmmmmmmommmmmmmmmmmmmmmmmmmmmmmmm■mom mmmm■mmmmmmm®®mm®mmmmmmmm®mm®mmmmm®mom ®�mm■mmmmmmmmmmmmmmmmmmmmmmmmmmmmmm■mm� mmm�mmmommm®mmmmmmmm®m®mmmmmmmmmm■mm� INLETSOFT BY ENSOFTEC DATE: MG l LD-229 STORM SEWER DESIGN COMPUTATIONS STORM FREQUENCY 10 PROJECT: HARK VINEYARDS LOCATION: EARLVSVILLE COUNTY: Free Union NOAA STATION: Designed by: A. MABEE Checked by: UNITS ENGLISN PWE NO, FROMMM TO POIMP DRALY, AREA "A' Acre (3 RUNOFF COEFF. "C" (0 CA TOTAL WLFT TL M1Gnures ('1 RAW FALL WHr 8 RUNOFF INVERT ELEVATIONS LENGTH ofRlp FL 12 MOM FlI . 13 SIZE (Dia.0 Spao/Riee) la 16 SHAPE Nmi- ofmi Capai CFS IS Fmdan Slope P/R. NORMAL FLOW FLOW TRAE Sec. tl REMARKS 18 INCRE-ACCGM- MENT (5 ULATED 6 Ue od CFS TowQ CFS (9 UPPER END (10 LOWER END 11 Depl6al Flow,& Ft A aal Flow, Aa SqF[ Hm Ft Vn Fd ec (16 Pn Ft REFERENCE 1 STA. REFERENCH 2 STA. 101 102 100 0.01 0.00 005 509 5.86 0.00 003 620.89 593.52 237.05 ). A IS Ci . 1 2099 0.00350 0.37 0.31 0.21 13.20 308 IT" 103 STORAGE 102 0.01 0.00 005 501 566 0.00 OD3 637,50 625." 83.15 0.16501 IS Ci . I 26.65 0.00350 0.33 0.26 0.19 1566 0.14 531 111 112 STORAGE 0.06 0m 0.05 0,19 SW 5]0 0.00 LIO 66356 62.M IL25 0.09959 12 Ci . 1 12,18 &00090 0.20 0.11 0.12 %63 160 127 113 116 122 0.06 Do 0.03 0,16 5% 5]8 0.00 081 6U,61 613.75 41W O.2 12 Ci . 1 5A6 0.00150 026 0.16 0.15 6.99 065 860 115 116 IIJ 0.26 003 0.11 0,11 501 589 0.00 066 W'n 6 .71 79.2A 0.01936 12 Ci . 1 5A5 &00030 024 0,16 0.16 6.69 058 16.89 121 122 STORAGE DAI 063 026 OW 533 5]9 0.00 291 63961 63].80 163.66 O.OIW2 IS Ci - 1 701 0.00180 056 056 0.29 5.65 102 30.05 123 126 122 0.29 00] 0.10 0.16 501 589 0.00 O80 6f0.06 639.29 T1.25 0.0193] 12 Cirtuly 1 3.85 O.ONfO 031 021 0.18 3.88 0.50 19.96 131 132 122 0.12 089 0.11 0,11 501 589 0.00 063 661ID 639.60 10.020011 12 1 Ci - I 1 1 5A6 &000301 023 1 0,16 0.16 6.60 0.56 15.86 LD-347 PROJECT: HARK VINEYARDS DESIGNED BY: A. MABEE HYDRAULIC GRADE LINE ANALYSIS Checked: INCIDENCE PROBABILITY 10 Yam INLET OR JUNCTION STA. INVERT EL. OUTFLOW PIPE DEPTH OF FLOW OUTFLOW PIPE OUTLET WATER SURFACE EtEV.(IN-) DIA PIPE W DESIGN DISCH. Co CFMW(AVM) LENGTH PIPE Lo FRICTION SLOPE, Sk (FUFT) MM1 FRICTION LOSS 4 FV JUNCTION LOSS SURFACE FLOW Rd. HI 1.3 M Inlet Inlet TIOMH Shm,,? 0.5 FINAL Water TWNINut AQu W? M H Surta u FIW✓ YM FYM FUTA Elevmim APPROX. Vo Cum. Hu Vi M'2Qg Hi(ExM) 0.35'MAX. Y SKEW AWIV K Pend H Sum HL FM 1 2 3 4 5 6 T 8 9 10 11 12 13 16 15 16 16 1 18 19 STORAGE 643.030 122 637.800 1.25 643.030 15 2.913 163.64 0.00181 0.296 5.446 0.115 4.988 0.386 0.135 0.0 0.00 0.000 0.250 1.494 0.325 YES 0.163 0.459 643.489 643.500 O.K. 124 639.290 1.00 643.489 12 0.800 77.25 0.00045 0.035 3.875 0.058 0.000 0.000 0.000 0.0 0.00 0.000 0.058 0.800 0.076 YES 0.038 0.073 643.562 643.610 O.K. 112 642.340 1.00 643.140 12 1.102 12.25 0.00085 0.010 9.634 0.360 0.000 0.000 0.000 0.0 0.00 0.000 0.360 0.293 0.468 NO 0.468 0.479 643.763 649.500 O.K. 114 643.750 1.00 644.550 12 0.809 42.92 0.00046 0.020 4.988 0.097 4.693 0.342 0.120 0.0 0.00 1 0.000 0.216 0.150 0.216 YES 0.108 0.128 644.870 650.500 O.K. 116 644.710 1.00 645.510 12 0.659 79.24 0.00030 0.024 4.693 0.085 0.000 0.000 0.000 0.0 0.00 0.000 0.085 0.659 0.111 YES 0.056 0.080 646.525 649.830 O.K. 132 639.600 1.00 643.489 12 0.630 73.48 0.00028 0.020 4.639 0.084 0.000 0.000 0.000 0.0 0.00 0.000 0.084 0.630 0.109 NO 0.109 0.129 643.618 645.110 O.K. 102 599.520 1.25 600.900 15 4.030 23T.d5 0.003d] 0.823 13.201 0.677 15.658 3.807 1.332 0.0 0.00 0.000 2.009 0.000 2.009 YES 1.004 1.828 621.261 628.950 O.K. STORAGE 625."0 1.25 626."0 15 4.030 83.15 1 0.00347 0.288 15.658 0.952 5.446 0.461 0.161 0.0 1 0.00 0.000 1.113 0.000 1.113 YES 0.556 0.845 637.828 643.500 O.K. PROJECT HARE VINEYARD SHEET UNITS OF ENGLISH CULVERT DESIGNER: REVIEWER: DESIGN AMABEF iHOWALT FORM LD-269 DATE: DATE: 2/32021 ROAD COUNTY AWemarle(Zone 1) CULVERT 201 VA NOAA Station Free Union HYDROLOGICAL DATA Method: RATIONAL Drainage Area: 0.2 Acres Timeof Concentration 5 Minutes DESIGN FLOWS ShIdr. EFF EH= 1- S= SKEW = Ekv. U.= ELHWd= 644.19 0.00 fl 643.71 R 52.99 R 4.34% an Roadway Width 12 ft ROADWAY ELEVATION ft R �-------- 7 __________________________________________________ J Hwi ----- DEPRESSION 0 m. sus Rod 0.013 M,i.59 ft __________ _________________________ E,_ Road Ungh 53 Freeboard= SNdr. Ekv. RL= __. H TWDEPTH TW TW VEL Cbaanel lnv.EL. 641.42 N Sntam Type #VALUE! 0.39 2A2 641A2 PAVED ft ft N fps ft R.I. (years) FLOW (efs) 10 Design 0.75 2 Check 0.63 10 Max. 0.75 CULVERT DESCRIPTION: TYPE: Single/Multiple Confammng Inlet Edge Description: Square edge w/headwall TOTAL FLOW Q cfs FLOWPER ll R QM cfs HEADWATER CALCULATIONS CONTROL HEADWATER ELEV R OUTLET VEL fps MINIMUM SHOULDER PI FV, N COMMENTS INUPI CONTROL OUTLET CONTROL Sinak, / Multoik, C.0canuin,/ Broken Back Culverts HWM HWi R FALL H ELHWi H TW ft do R (dc+DM R In ft 4e H ft ELHWo N MATERIAL SHAPE Size (in) N Mannings Concrete Ckcukr 12 1 0.01 0.95 0.8 0.48 0.48 0.00 644.19 0.39 0.36 0.68 0.68 0.50 0.04 642.15 644.19 6.05 0.63 0.6 0.44 0.44 0.00 644.15 0.37 0.33 0.67 0.67 0.50 0.03 642.12 644.15 5.76 075 0.8 0.48 0.48 0.00 644.19 0.39 0.36 0.68 0.68 0.50 0.04 M2.15 644.19 6.05 Broken Back Culver[ T'AD,WATER DATA: AILWATERRESULTS: ROADWAY DATA: ROADWAY OVERTOPPING: LENGTH Ek, SKEW Shape Triangular = 0.035 Discharge cfs Elevation ft Fbw depth It V.-" fps Shure a PSF oadway Wwffi,ft 12 Dischargr Overtopping Discharge CIS Overtopping Ele-tan ft M. Width,N Side Slopa LC (H:1 V) Side Slops RL(HAV) Channel SlWe. lVlt 0.00 "d-Type PAVED 2.00 641.81 0.39 2.42 RAI Top 0 Road Elevation R 048.59 Desi 0 0.00 2.00 ck 641]9 0.37 2.32 0.76 Lengto 0 Road, It 53 cIsak 0 0.00 0.0330 Mill 0.39 2.42 0.81 0 0.00 tetra kvation TECHNICAL FOOTNOTES: (1) USE Q/NB FOR BOX CULVERTS (4) ELhi=HWiIELi(INVERT OF INLET CONTROL SECTION) (6)ho= TW or I&. D2)(WHICHEVER IS GREATER) (2)HWi/D= HW/D OR HWVD FROM DESIGN CHARTS (5) TW BASED ON DOWNSTREAM CONTROL OR FLOW (7)H=[1+lee+(29nsLFR"`)i,22g (3) FAIL =HWI-(ELHWd-ELsO; FALL IS ZERO FOR CULVERTS ON GRADE DEPTHINCHANNEL SUBSCRIPT DEFINITIONS: CONEU12M / DISCUSSION: CULVERT BARREL SELECTED HWd DESIGN HEADWATER r INLET SIZE: n. DWI HW IN INLET CONTROL 0 OUTLET SHAPE: MATERIAL: HWo HW IN OUTLET CONTROL sf Streambed CE: 0 culvert face CULVERTSOFT by ENSOFTEC, INC. PROJECT HARK VINEYARD CULVERT DESIGN FORM L 269 ROAD COUNTY Alt, m.k (Zone 1) SHEET OF DESIGNER: A MABEF DATE: 2/3nWI CULVERT 201 VA UNITS ENGLISd REVIEWER: iHOWALT DATE: NOAA SIadoa Fa Vmon H.W. ELEV V/S DISCHARGE OUTLET VELOCITY V/S DISCHARGE 644.2 6.1 644.2 6.1 644.2 6.0 644.2 �W644.2 C 6.0 y44.2 > 5.9 3fi442 w 5.9 s644.2 F 644 2 O 5.8 644.2 5.8 644.1 5.7 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 DISCHARGE DISCHARGE TW DEPTH V/S DISCHARGE 0.4 0.4 - Z 0.4 rL 0.4 0.4 0.4 0.4 1 1 1 1 1 1 1 1 DISCHARGE CULVERTSOFT by ENSOFTEC, INC. TW VELOCITY V/S DISCHARGE 2.4 2.4 2.4 H 2.4 J > 2.4 F 2.3 2.3 2.3 1 1 1 1 1 1 1 1 DISCHARGE 11S 2S —�/8P\ —� 5L Post -Developed Area 1 Storage Pipes Outfall Pre -Developed Area 1 Routed 12S 14S Pre -Developed Area 2 Post -Developed Area 2 to Sheet Flow to Sheet Flow Subcat Reach On Link Routing Diagram for Hark SWM-2 Prepared by Timmons Group, Printed 4/6/2021 FHydroCADO10.00-20 sfn 06538 0 2017 HydroCAD Software Solutions LLC Hark SWM-2 Prepared by Timmons Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 1.350 65 Grass cover, HSG B (11S) 0.750 65 Grass, HSG B (2S) 0.780 98 Paved parking, HSG B (2S, 12S, 14S) 6.910 65 Woods, HSG B (I 2S, 14S) 9.790 68 TOTAL AREA Printed 4/6/2021 Hark SWM-2 Prepared by Timmons Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 9.790 HSG B 2S, 11S, 12S, 14S 0.000 HSG C 0.000 HSG D 0.000 Other 9.790 TOTAL AREA Printed 4/6/2021 Hark SWM-2 Prepared by Timmons Ground Covers (all nodes) Printed 4/6/2021 HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 0.750 0.000 0.000 0.000 0.750 Grass 2S 0.000 1.350 0.000 0.000 0.000 1.350 Grass cover 11S 0.000 0.780 0.000 0.000 0.000 0.780 Paved parking 2S, 12S, 14S 0.000 6.910 0.000 0.000 0.000 6.910 Woods 12S, 14S 0.000 9.790 0.000 0.000 0.000 9.790 TOTAL AREA Hark SWM-2 Prepared by Timmons G Type 11 24-hr 1 Year Rainfall=3.02" Printed 4/6/2021 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 2S: Post -Developed Areal Runoff Area=1.350 ac 44.44% Impervious Runoff Depth>1.16" Tc=6.0 min CN=80 Runoff=2.98 cfs 0.130 of Subcatchment 11S: Pre -Developed Area 1 Runoff Area=1.350 ac 0.00% Impervious Runoff Depth>0.45" Flow Length=475' Tc=8.9 min CN=65 Runoff=0.91 cfs 0.050 of Subcatchment 12S: Pre -Developed Area 2 to Runoff Area=3.530 ac 1.42% Impervious Runoff Depth>0.45" Flow Length=475' Tc=8.9 min CN=65 Runoff=2.37 cfs 0.132 of Subcatchment 14S: Post -Developed Area 2 Runoff Area=3.560 ac 3.65% Impervious Runoff Depth>0.48" Flow Length=475' Tc=8.9 min CN=66 Runoff=2.66 cfs 0.144 of Pond 813: Storage Pipes Peak Elev=640.42' Storage=0.058 of Inflow=2.98 cfs 0.130 of Outflow=0.28 cfs 0.129 of Link 5L: Outfall Inflow=0.28 cfs 0.129 of Primary=0.28 cfs 0.129 of Total Runoff Area = 9.790 ac Runoff Volume = 0.456 of Average Runoff Depth = 0.56" 92.03% Pervious = 9.010 ac 7.97% Impervious = 0.780 ac Hark SWM-2 Prepared by Timmons Type/1 24-hr 1 Year Rainfall=3.02" Printed 4/6/2021 Summary for Subcatchment 2S: Post -Developed Area 1 Routed Runoff = 2.98 cfs @ 11.98 hrs, Volume= 0.130 af, Depth> 1.16" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1 Year Rainfall=3.02" Area (ac) CN DescriDtion 0.750 65 Grass, HSG B 0.600 98 Paved parking, HSG B 1.350 80 Weighted Average 0.750 55.56% Pervious Area 0.600 44.44% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/f0 (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 2S: Post -Developed Area 1 Routed 3 I I I I I I I I I I I I I I I I I I I I I I I 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 a I I I I I I I I I I I I I I I I I 3 I I I I I I 0 I I I I I LL 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 ■ Runoff Type 11 24yhr 1 Year Rainfalit3.02" Runoff Are6=1.350 lac Ruhoff'IVofurn- 113DLaf Runoff Depth.1.116" Tic=610 niin I �_ + -I - F 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Hark SWM-2 Prepared by Timmons Type/1 24-hr 1 Year Rainfall=3.02" Printed 4/6/2021 Hydrograph for Subcatchment 2S: Post -Developed Area 1 Routed Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.28 0.00 0.00 7.00 0.30 0.00 0.00 7.25 0.31 0.00 0.00 7.50 0.33 0.00 0.00 7.75 0.35 0.00 0.00 8.00 0.36 0.00 0.00 8.25 0.38 0.00 0.00 8.50 0.40 0.00 0.00 8.75 0.42 0.00 0.00 9.00 0.44 0.00 0.00 9.25 0.47 0.00 0.00 9.50 0.49 0.00 0.00 9.75 0.52 0.00 0.00 10.00 0.55 0.00 0.00 10.25 0.58 0.00 0.01 10.50 0.62 0.01 0.02 10.75 0.66 0.01 0.03 11.00 0.71 0.02 0.04 11.25 0.77 0.03 0.06 11.50 0.85 0.04 0.10 11.75 1.17 0.14 0.64 12.00 2.00 0.56 2.86 12.25 2.13 0.64 0.43 12.50 2.22 0.70 0.29 12.75 2.28 0.74 0.21 13.00 2.33 0.77 0.18 13.25 2.37 0.80 0.16 13.50 2.41 0.83 0.14 13.75 2.45 0.85 0.12 14.00 2.48 0.87 0.11 14.25 2.50 0.89 0.10 14.50 2.53 0.91 0.10 14.75 2.55 0.93 0.09 15.00 2.58 0.94 0.09 15.25 2.60 0.96 0.08 15.50 2.62 0.97 0.08 15.75 2.64 0.99 0.07 16.00 2.66 1.00 0.07 16.25 2.67 1.01 0.07 16.50 2.69 1.02 0.06 16.75 2.71 1.04 0.06 17.00 2.72 1.05 0.06 17.25 2.74 1.06 0.06 17.50 2.75 1.07 0.06 17.75 2.77 1.08 0.06 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 2.78 1.09 0.05 18.25 2.79 1.10 0.05 18.50 2.81 1.11 0.05 18.75 2.82 1.12 0.05 19.00 2.83 1.13 0.05 19.25 2.84 1.13 0.05 19.50 2.85 1.14 0.04 19.75 2.86 1.15 0.04 20.00 2.88 1.16 0.04 Hark SWM-2 Prepared by Timmons G Type 11 24-hr 1 Year Rainfall=3.02" Printed 4/6/2021 Summary for Subcatchment 11 S: Pre -Developed Area 1 Runoff = 0.91 cfs @ 12.03 hrs, Volume= 0.050 af, Depth> 0.45" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1 Year Rainfall=3.02" Area (ac) CN Description 1.350 65 Grass cover, HSG B 1.350 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.4 100 0.0500 0.26 Sheet Flow, Grass: Short n= 0.150 P2= 3.65 2.5 375 0.1300 2.52 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fos 8.9 475 Total Subcatchment 11S: Pre -Developed Area 1 Hydrograph ❑ Runotf Type II 24-hr 1 Year Rainfall=3.02" Runoff Area=1.350 ac Runoff Volume=0.050 of Runoff Depth>0.45" Flow Length=475' Tc=8.9 min r_3M.v 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Hark SWM-2 Prepared by Timmons Type/1 24-hr 1 Year Rainfall=3.02" Hydrograph for Subcatchment 11S: Pre -Developed Area 1 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.28 0.00 0.00 7.00 0.30 0.00 0.00 7.25 0.31 0.00 0.00 7.50 0.33 0.00 0.00 7.75 0.35 0.00 0.00 8.00 0.36 0.00 0.00 8.25 0.38 0.00 0.00 8.50 0.40 0.00 0.00 8.75 0.42 0.00 0.00 9.00 0.44 0.00 0.00 9.25 0.47 0.00 0.00 9.50 0.49 0.00 0.00 9.75 0.52 0.00 0.00 10.00 0.55 0.00 0.00 10.25 0.58 0.00 0.00 10.50 0.62 0.00 0.00 10.75 0.66 0.00 0.00 11.00 0.71 0.00 0.00 11.25 0.77 0.00 0.00 11.50 0.85 0.00 0.00 11.75 1.17 0.00 0.00 12.00 2.00 0.14 0.87 12.25 2.13 0.17 0.24 12.50 2.22 0.20 0.15 12.75 2.28 0.22 0.11 13.00 2.33 0.24 0.09 13.25 2.37 0.25 0.08 13.50 2.41 0.27 0.07 13.75 2.45 0.28 0.07 14.00 2.48 0.29 0.06 14.25 2.50 0.30 0.06 14.50 2.53 0.31 0.05 14.75 2.55 0.32 0.05 15.00 2.58 0.33 0.05 15.25 2.60 0.34 0.05 15.50 2.62 0.34 0.04 15.75 2.64 0.35 0.04 16.00 2.66 0.36 0.04 16.25 2.67 0.37 0.04 16.50 2.69 0.37 0.04 16.75 2.71 0.38 0.04 17.00 2.72 0.39 0.04 17.25 2.74 0.39 0.03 17.50 2.75 0.40 0.03 17.75 2.77 0.40 0.03 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 2.78 0.41 0.03 18.25 2.79 0.42 0.03 18.50 2.81 0.42 0.03 18.75 2.82 0.43 0.03 19.00 2.83 0.43 0.03 19.25 2.84 0.44 0.03 19.50 2.85 0.44 0.03 19.75 2.86 0.45 0.03 20.00 2.88 0.45 0.02 Printed 4/6/2021 Hark SWM-2 Prepared by Timmons Type/1 24-hr 1 Year Rainfall=3.02" Printed 4/6/2021 Summary for Subcatchment 12S: Pre -Developed Area 2 to Sheet Flow Runoff = 2.37 cfs @ 12.03 hrs, Volume= 0.132 af, Depth> 0.45" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1 Year Rainfall=3.02" Area (ac) CN Description 3.480 65 Woods, HSG B 0.050 98 Paved parking, HSG B 3.530 65 Weighted Average 3.480 98.58% Pervious Area 0.050 1.42% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/f0 (ft/sec) (cfs) 6.4 100 0.0500 0.26 Sheet Flow, Grass: Short n= 0.150 P2= 3.65' 2.5 375 0.1300 2.52 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fos 8.9 475 Total Subcatchment 12S: Pre -Developed Area 2 to Sheet Flow Hydrogreph C 2 I N ' I o I ' ' ' ' 'I 'I 'I ■Runoff Type 11 24,1hr JI 1- Year RainfaM 3.02"- Runoff Areal=3.530'ac Runoff'I Vol'lume=0.'11l32''I of Runoff Depth-0.45' FloW Lehath=475' Tc=&9 rain dN=65 10 11 12 13 Time (hours) Hark SWM-2 Prepared by Timmons Type/1 24-hr 1 Year Rainfall=3.02" Printed 4/6/2021 Hydrograph for Subcatchment 12S: Pre -Developed Area 2 to Sheet Flow Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.28 0.00 0.00 7.00 0.30 0.00 0.00 7.25 0.31 0.00 0.00 7.50 0.33 0.00 0.00 7.75 0.35 0.00 0.00 8.00 0.36 0.00 0.00 8.25 0.38 0.00 0.00 8.50 0.40 0.00 0.00 8.75 0.42 0.00 0.00 9.00 0.44 0.00 0.00 9.25 0.47 0.00 0.00 9.50 0.49 0.00 0.00 9.75 0.52 0.00 0.00 10.00 0.55 0.00 0.00 10.25 0.58 0.00 0.00 10.50 0.62 0.00 0.00 10.75 0.66 0.00 0.00 11.00 0.71 0.00 0.00 11.25 0.77 0.00 0.00 11.50 0.85 0.00 0.00 11.75 1.17 0.00 0.00 12.00 2.00 0.14 2.27 12.25 2.13 0.17 0.63 12.50 2.22 0.20 0.39 12.75 2.28 0.22 0.29 13.00 2.33 0.24 0.25 13.25 2.37 0.25 0.22 13.50 2.41 0.27 0.19 13.75 2.45 0.28 0.17 14.00 2.48 0.29 0.16 14.25 2.50 0.30 0.15 14.50 2.53 0.31 0.14 14.75 2.55 0.32 0.13 15.00 2.58 0.33 0.13 15.25 2.60 0.34 0.12 15.50 2.62 0.34 0.12 15.75 2.64 0.35 0.11 16.00 2.66 0.36 0.10 16.25 2.67 0.37 0.10 16.50 2.69 0.37 0.10 16.75 2.71 0.38 0.09 17.00 2.72 0.39 0.09 17.25 2.74 0.39 0.09 17.50 2.75 0.40 0.09 17.75 2.77 0.40 0.09 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 2.78 0.41 0.08 18.25 2.79 0.42 0.08 18.50 2.81 0.42 0.08 18.75 2.82 0.43 0.08 19.00 2.83 0.43 0.07 19.25 2.84 0.44 0.07 19.50 2.85 0.44 0.07 19.75 2.86 0.45 0.07 20.00 2.88 0.45 0.06 Hark SWM-2 Prepared by Timmons G Type 11 24-hr 1 Year Rainfall=3.02" Printed 4/6/2021 Summary for Subcatchment 14S: Post -Developed Area 2 to Sheet Flow Runoff = 2.66 cfs @ 12.02 hrs, Volume= 0.144 af, Depth> 0.48" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 1 Year Rainfall=3.02" Area (ac) CN Description 3.430 65 Woods, HSG B 0.130 98 Paved parking, HSG B 3.560 66 Weighted Average 3.430 96.35% Pervious Area 0.130 3.65% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.4 100 0.0500 0.26 Sheet Flow, Grass: Short n= 0.150 P2= 3.65' 2.5 375 0.1300 2.52 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps M 2 F 475 Total Subcatchment 14S: Post -Developed Area 2 to Sheet Flow Hydrograph Type II 24-hr 1 Year Rainfall=3.02" Runoff Area=3.560 ac Runoff Volume=0.144 of Runoff Depth>0.48" Flow Length=475' Tc=8.9 min CN=66 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runotf Hark SWM-2 Prepared by Timmons Type/1 24-hr 1 Year Rainfall=3.02" Printed 4/6/2021 Hydrograph for Subcatchment 14S: Post -Developed Area 2 to Sheet Flow Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.22 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.26 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.28 0.00 0.00 7.00 0.30 0.00 0.00 7.25 0.31 0.00 0.00 7.50 0.33 0.00 0.00 7.75 0.35 0.00 0.00 8.00 0.36 0.00 0.00 8.25 0.38 0.00 0.00 8.50 0.40 0.00 0.00 8.75 0.42 0.00 0.00 9.00 0.44 0.00 0.00 9.25 0.47 0.00 0.00 9.50 0.49 0.00 0.00 9.75 0.52 0.00 0.00 10.00 0.55 0.00 0.00 10.25 0.58 0.00 0.00 10.50 0.62 0.00 0.00 10.75 0.66 0.00 0.00 11.00 0.71 0.00 0.00 11.25 0.77 0.00 0.00 11.50 0.85 0.00 0.00 11.75 1.17 0.00 0.01 12.00 2.00 0.15 2.56 12.25 2.13 0.19 0.69 12.50 2.22 0.22 0.42 12.75 2.28 0.24 0.31 13.00 2.33 0.26 0.26 13.25 2.37 0.28 0.23 13.50 2.41 0.29 0.21 13.75 2.45 0.31 0.19 14.00 2.48 0.32 0.17 14.25 2.50 0.33 0.15 14.50 2.53 0.34 0.15 14.75 2.55 0.35 0.14 15.00 2.58 0.36 0.14 15.25 2.60 0.37 0.13 15.50 2.62 0.37 0.12 15.75 2.64 0.38 0.12 16.00 2.66 0.39 0.11 16.25 2.67 0.40 0.10 16.50 2.69 0.41 0.10 16.75 2.71 0.41 0.10 17.00 2.72 0.42 0.10 17.25 2.74 0.43 0.10 17.50 2.75 0.43 0.09 17.75 2.77 0.44 0.09 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 2.78 0.44 0.09 18.25 2.79 0.45 0.09 18.50 2.81 0.46 0.08 18.75 2.82 0.46 0.08 19.00 2.83 0.47 0.08 19.25 2.84 0.47 0.07 19.50 2.85 0.48 0.07 19.75 2.86 0.48 0.07 20.00 2.88 0.49 0.07 Hark SWM-2 Prepared by Timmons G Type 11 24-hr 1 Year Rainfall=3.02" Printed 4/6/2021 Summary for Pond 8P: Storage Pipes Inflow Area = 1.350 ac, 44.44% Impervious, Inflow Depth > 1.16" for 1 Year event Inflow = 2.98 cfs @ 11.98 hrs, Volume= 0.130 of Outflow = 0.28 cfs @ 12.52 hrs, Volume= 0.129 af, Atten= 91 %, Lag= 32.6 min Primary = 0.28 cfs @ 12.52 hrs, Volume= 0.129 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs / 2 Peak Elev= 640.42' @ 12.52 hrs Surf.Area= 0.025 ac Storage= 0.058 of Plug -Flow detention time= 101.2 min calculated for 0.128 of (99% of inflow) Center -of -Mass det. time= 97.4 min ( 894.4 - 797.0) Volume Invert Avail.Storage Storage Description #1 637.50' 0.120 of 72.0" Round Pipe Storage L= 185.0' Device Routing Invert Outlet Devices #1 Primary 637.50' 2.5" Vert. Orifice/Grate C= 0.600 #2 Primary 640.50' 12.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 #3 Primary 643.00' 4.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=0.28 cfs @ 12.52 hrs HW=640.42' (Free Discharge) �1=Orifice/Grate (Orifice Controls 0.28 cfs @ 8.08 fps) 2=Orifice/Grate ( Controls 0.00 cfs) 3=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) N u Pond 8P: Storage Pipes Hydrograph Time (hours) ❑ Inflow -11 ❑ Primary Hark SWM-2 Type // 24-hr 1 Year Rainfall=3.02" Prepared by Timmons Group Printed 4/6/2021 Pond 8P: Storage Pipes Stage -Discharge Sharp -Crested Rectangular Weir 642 I I I I m 641 ., /� Grat_t' O _ 640 III� IIIII Wt _IIIIrIII yIIIIIIIII 70rifice/Grate 639 638 0 1 2 3 4 5 6 7 8 Discharge (cfs) Pond 8P: Storage Pipes Stage -Area -Storage I I I I I I I I I I I I I I I I I I I I I I 643 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 64Q I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 641 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I C I I I I I I I I I I I I I I I I I I I O I I I I I I I I I I I I I I I I I I I d 640 I I I I I I I I I I I I I I I I W I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I i i i I I I I I I I I I I I I I I I I I I I I I I I I I I i 639 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 638 I I I I I I I I I I I I I I I I I I I I I Pipe Storage 0 0.0050.010.0150.020.0250.030.0350.040.0450.050.0550.060.0650.070.0750.080.0850.090.0950.1 0.1050.110.1150.11 Storage (acre-feet) ■ Primary ■ Storage Hark SWM-2 Prepared by Timmons Type/1 24-hr 1 Year Rainfall=3.02" Printed 4/6/2021 Hydrograph for Pond 813: Storage Pipes Time Inflow Storage Elevation Primary (hours) (cfs) (acre-feet) (feet) (cfs) 5.00 0.00 0.000 637.50 0.00 5.50 0.00 0.000 637.50 0.00 6.00 0.00 0.000 637.50 0.00 6.50 0.00 0.000 637.50 0.00 7.00 0.00 0.000 637.50 0.00 7.50 0.00 0.000 637.50 0.00 8.00 0.00 0.000 637.50 0.00 8.50 0.00 0.000 637.50 0.00 9.00 0.00 0.000 637.50 0.00 9.50 0.00 0.000 637.50 0.00 10.00 0.00 0.000 637.51 0.00 10.50 0.02 0.000 637.57 0.01 11.00 0.04 0.001 637.63 0.03 11.50 0.10 0.002 637.73 0.06 12.00 2.86 0.039 639.66 0.24 12.50 0.29 0.058 640.42 0.28 13.00 0.18 0.056 640.33 0.27 13.50 0.14 0.051 640.15 0.26 14.00 0.11 0.046 639.93 0.25 14.50 0.10 0.040 639.70 0.24 15.00 0.09 0.034 639.46 0.22 15.50 0.08 0.029 639.23 0.21 16.00 0.07 0.023 638.99 0.19 16.50 0.06 0.018 638.77 0.18 17.00 0.06 0.014 638.55 0.16 17.50 0.06 0.010 638.35 0.14 18.00 0.05 0.007 638.16 0.12 18.50 0.05 0.005 638.00 0.10 19.00 0.05 0.003 637.86 0.08 19.50 0.04 0.002 637.76 0.06 20.00 0.04 0.001 637.70 0.05 Hark SWM-2 Prepared by Timmons Elevation Primary (feet) (cfs) 637.50 0.00 637.54 0.00 637.58 0.01 637.62 0.02 637.66 0.04 637.70 0.05 637.74 0.06 637.78 0.07 637.82 0.08 637.86 0.08 637.90 0.09 637.94 0.10 637.98 0.10 638.02 0.11 638.06 0.11 638.10 0.12 638.14 0.12 638.18 0.12 638.22 0.13 638.26 0.13 638.30 0.14 638.34 0.14 638.38 0.14 638.42 0.15 638.46 0.15 638.50 0.16 638.54 0.16 638.58 0.16 638.62 0.17 638.66 0.17 638.70 0.17 638.74 0.17 638.78 0.18 638.82 0.18 638.86 0.18 638.90 0.19 638.94 0.19 638.98 0.19 639.02 0.20 639.06 0.20 639.10 0.20 639.14 0.20 639.18 0.21 639.22 0.21 639.26 0.21 639.30 0.21 639.34 0.22 639.38 0.22 639.42 0.22 639.46 0.22 639.50 0.23 639.54 0.23 Type/1 24-hr 1 Year Rainfall=3.02" Stage -Discharge for Pond 8P: Storage Pipes Elevation Primary (feet) (cfs) 639.58 0.23 639.62 0.23 639.66 0.24 639.70 0.24 639.74 0.24 639.78 0.24 639.82 0.24 639.86 0.25 639.90 0.25 639.94 0.25 639.98 0.25 640.02 0.26 640.06 0.26 640.10 0.26 640.14 0.26 640.18 0.26 640.22 0.27 640.26 0.27 640.30 0.27 640.34 0.27 640.38 0.27 640.42 0.28 640.46 0.28 640.50 0.28 640.54 0.31 640.58 0.36 640.62 0.42 640.66 0.49 640.70 0.58 640.74 0.67 640.78 0.77 640.82 0.88 640.86 0.99 640.90 1.11 640.94 1.24 640.98 1.37 641.02 1.50 641.06 1.60 641.10 1.70 641.14 1.78 641.18 1.87 641.22 1.94 641.26 2.02 641.30 2.08 641.34 2.15 641.38 2.22 641.42 2.28 641.46 2.34 641.50 2.40 641.54 2.46 641.58 2.51 641.62 2.57 Elevation Primary (feet) (cfs) 641.66 2.62 641.70 2.67 641.74 2.72 641.78 2.77 641.82 2.82 641.86 2.87 641.90 2.92 641.94 2.96 641.98 3.01 642.02 3.05 642.06 3.10 642.10 3.14 642.14 3.18 642.18 3.23 642.22 3.27 642.26 3.31 642.30 3.35 642.34 3.39 642.38 3.43 642.42 3.47 642.46 3.51 642.50 3.55 642.54 3.58 642.58 3.62 642.62 3.66 642.66 3.69 642.70 3.73 642.74 3.77 642.78 3.80 642.82 3.84 642.86 3.87 642.90 3.91 642.94 3.94 642.98 3.97 643.02 4.04 643.06 4.23 643.10 4.49 643.14 4.79 643.18 5.13 643.22 5.51 643.26 5.91 643.30 6.35 643.34 6.82 643.38 7.30 643.42 7.81 643.46 8.35 643.50 8.90 Printed 4/6/2021 Hark SWM-2 Prepared by Timmons Elevation Storage (feet) (acre-feet) 637.50 0.000 637.54 0.000 637.58 0.000 637.62 0.001 637.66 0.001 637.70 0.001 637.74 0.002 637.78 0.002 637.82 0.002 637.86 0.003 637.90 0.003 637.94 0.004 637.98 0.005 638.02 0.005 638.06 0.006 638.10 0.006 638.14 0.007 638.18 0.008 638.22 0.008 638.26 0.009 638.30 0.010 638.34 0.010 638.38 0.011 638.42 0.012 638.46 0.012 638.50 0.013 638.54 0.014 638.58 0.015 638.62 0.015 638.66 0.016 638.70 0.017 638.74 0.018 638.78 0.019 638.82 0.020 638.86 0.020 638.90 0.021 638.94 0.022 638.98 0.023 639.02 0.024 639.06 0.025 639.10 0.026 639.14 0.027 639.18 0.028 639.22 0.028 639.26 0.029 639.30 0.030 639.34 0.031 639.38 0.032 639.42 0.033 639.46 0.034 639.50 0.035 639.54 0.036 Type/1 24-hr 1 Year Rainfall=3.02" Stage -Area -Storage for Pond 8P: Storage Pipes Elevation Storage (feet) (acre-feet) 639.58 0.037 639.62 0.038 639.66 0.039 639.70 0.040 639.74 0.041 639.78 0.042 639.82 0.043 639.86 0.044 639.90 0.045 639.94 0.046 639.98 0.047 640.02 0.048 640.06 0.049 640.10 0.050 640.14 0.051 640.18 0.052 640.22 0.053 640.26 0.054 640.30 0.055 640.34 0.056 640.38 0.057 640.42 0.058 640.46 0.059 640.50 0.060 640.54 0.061 640.58 0.062 640.62 0.063 640.66 0.064 640.70 0.065 640.74 0.066 640.78 0.067 640.82 0.068 640.86 0.069 640.90 0.070 640.94 0.071 640.98 0.072 641.02 0.073 641.06 0.074 641.10 0.075 641.14 0.076 641.18 0.077 641.22 0.078 641.26 0.079 641.30 0.080 641.34 0.081 641.38 0.082 641.42 0.083 641.46 0.084 641.50 0.085 641.54 0.086 641.58 0.087 641.62 0.088 Elevation Storage (feet) (acre-feet) 641.66 0.089 641.70 0.090 641.74 0.091 641.78 0.092 641.82 0.093 641.86 0.093 641.90 0.094 641.94 0.095 641.98 0.096 642.02 0.097 642.06 0.098 642.10 0.099 642.14 0.100 642.18 0.100 642.22 0.101 642.26 0.102 642.30 0.103 642.34 0.104 642.38 0.105 642.42 0.105 642.46 0.106 642.50 0.107 642.54 0.108 642.58 0.108 642.62 0.109 642.66 0.110 642.70 0.111 642.74 0.111 642.78 0.112 642.82 0.113 642.86 0.113 642.90 0.114 642.94 0.114 642.98 0.115 643.02 0.116 643.06 0.116 643.10 0.117 643.14 0.117 643.18 0.118 643.22 0.118 643.26 0.118 643.30 0.119 643.34 0.119 643.38 0.120 643.42 0.120 643.46 0.120 643.50 0.120 Printed 4/6/2021 Hark SWM-2 Prepared by Timmons Type/1 24-hr 1 Year Rainfall=3.02" Printed 4/6/2021 Summary for Link 5L: Outfall Inflow Area = 1.350 ac, 44.44% Impervious, Inflow Depth > 1.14" for 1 Year event Inflow = 0.28 cfs @ 12.52 hrs, Volume= 0.129 of Primary = 0.28 cfs @ 12.52 hrs, Volume= 0.129 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 5L: Outfall Hydrograph ■Inflow 0.3 ---L----1----L---J--------L-------L---'--------`---J----L___ I I I I I I I ■Primary / -inflow Ariea�tt._3190 I I I I I o.2s / I I 0.24 I I I I I I I I I I I I I I I I I I I I I 0.22 ---- I__ --- __ ____I ___ _L _J _I _I _L _ _1 _J _L ___ 0.2 / I I I I ^ 0.18 I -T -r - r -r -I I I 0.16 I I I I I I I I 0 0.14 r LL I I I I I I I I 0.12 I I I I I I I I I I I I 01 I I I I I 0.08 r____ 1____ r___1____I___ _�____1____ r___,____I____r___ I I I I I I I I _ , _L _J _I _J _ 0.06 I I I I I I I I I 0.04 -I r - 1 -I 1 -I 0.02 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Hark SWM-2 Prepared by Timmons Type/1 24-hr 1 Year Rainfall=3.02" Hydrograph for Link 5L: Ouffall Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 5.00 0.00 0.00 0.00 5.25 0.00 0.00 0.00 5.50 0.00 0.00 0.00 5.75 0.00 0.00 0.00 6.00 0.00 0.00 0.00 6.25 0.00 0.00 0.00 6.50 0.00 0.00 0.00 6.75 0.00 0.00 0.00 7.00 0.00 0.00 0.00 7.25 0.00 0.00 0.00 7.50 0.00 0.00 0.00 7.75 0.00 0.00 0.00 8.00 0.00 0.00 0.00 8.25 0.00 0.00 0.00 8.50 0.00 0.00 0.00 8.75 0.00 0.00 0.00 9.00 0.00 0.00 0.00 9.25 0.00 0.00 0.00 9.50 0.00 0.00 0.00 9.75 0.00 0.00 0.00 10.00 0.00 0.00 0.00 10.25 0.00 0.00 0.00 10.50 0.01 0.00 0.01 10.75 0.02 0.00 0.02 11.00 0.03 0.00 0.03 11.25 0.04 0.00 0.04 11.50 0.06 0.00 0.06 11.75 0.11 0.00 0.11 12.00 0.24 0.00 0.24 12.25 0.27 0.00 0.27 12.50 0.28 0.00 0.28 12.75 0.27 0.00 0.27 13.00 0.27 0.00 0.27 13.25 0.27 0.00 0.27 13.50 0.26 0.00 0.26 13.75 0.26 0.00 0.26 14.00 0.25 0.00 0.25 14.25 0.24 0.00 0.24 14.50 0.24 0.00 0.24 14.75 0.23 0.00 0.23 15.00 0.22 0.00 0.22 15.25 0.22 0.00 0.22 15.50 0.21 0.00 0.21 15.75 0.20 0.00 0.20 16.00 0.19 0.00 0.19 16.25 0.19 0.00 0.19 16.50 0.18 0.00 0.18 16.75 0.17 0.00 0.17 17.00 0.16 0.00 0.16 17.25 0.15 0.00 0.15 17.50 0.14 0.00 0.14 17.75 0.13 0.00 0.13 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 18.00 0.12 0.00 0.12 18.25 0.11 0.00 0.11 18.50 0.10 0.00 0.10 18.75 0.09 0.00 0.09 19.00 0.08 0.00 0.08 19.25 0.07 0.00 0.07 19.50 0.06 0.00 0.06 19.75 0.06 0.00 0.06 20.00 0.05 0.00 0.05 Printed 4/6/2021 Hark SWM-2 Prepared by Timmons G Type 11 24-hr 10 Year Rainfall=5.49" Printed 4/6/2021 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 2S: Post -Developed Area 1 Runoff Area=1.350 ac 44.44% Impervious Runoff Depth>3.09" Tc=6.0 min CN=80 Runoff=7.62 cfs 0.347 of Subcatchment 11S: Pre -Developed Area 1 Runoff Area=1.350 ac 0.00% Impervious Runoff Depth>1.80" Flow Length=475' Tc=8.9 min CN=65 Runoff=4.20 cfs 0.203 of Subcatchment 12S: Pre -Developed Area 2 to Runoff Area=3.530 ac 1.42% Impervious Runoff Depth>1.80" Flow Length=475' Tc=8.9 min CN=65 Runoff=10.98 cfs 0.530 of Subcatchment 14S: Post -Developed Area 2 Runoff Area=3.560 ac 3.65% Impervious Runoff Depth>1.88" Flow Length=475' Tc=8.9 min CN=66 Runoff=11.56 cfs 0.557 of Pond 813: Storage Pipes Peak Elev=643.03' Storage=0.116 of Inflow=7.62 cfs 0.347 of Outflow=4.03 cfs 0.331 of Link 5L: Outfall Inflow=4.03 cfs 0.331 of Primary=4.03 cfs 0.331 of Total Runoff Area = 9.790 ac Runoff Volume = 1.637 of Average Runoff Depth = 2.01" 92.03% Pervious = 9.010 ac 7.97% Impervious = 0.780 ac Hark SWM-2 Prepared by Timmons Type 1124-hr 10 Year Rainfall=5.49" Printed 4/6/2021 Summary for Subcatchment 2S: Post -Developed Area 1 Routed Runoff = 7.62 cfs @ 11.97 hrs, Volume= 0.347 af, Depth> 3.09" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 Year Rainfall=5.49" Area (ac) CN DescriDtion 0.750 65 Grass, HSG B 0.600 98 Paved parking, HSG B 1.350 80 Weighted Average 0.750 55.56% Pervious Area 0.600 44.44% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/f0 (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 2S: Post -Developed Area 1 Routed _- _____ ____�___ ■Runoff 8 zszcia -- T pell24,,hr- 10 Year IRainfalit5.49' 6. Runbff Area=1.350 'ac -------Rurro0Vo1um0-_O 347raf- 5 , ; Runoff Depth 3.09 LL 4 Tic=6.0 n1in - ------r----I---- t--------�------�---- 3 H_ 0 p 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Hark SWM-2 Prepared by Timmons Type/1 24-hr 10 Year Rainfall=5.49" Printed 4/6/2021 Hydrograph for Subcatchment 2S: Post -Developed Area 1 Routed Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.35 0.00 0.00 5.25 0.37 0.00 0.00 5.50 0.39 0.00 0.00 5.75 0.41 0.00 0.00 6.00 0.44 0.00 0.00 6.25 0.46 0.00 0.00 6.50 0.49 0.00 0.00 6.75 0.52 0.00 0.00 7.00 0.54 0.00 0.00 7.25 0.57 0.00 0.01 7.50 0.60 0.00 0.01 7.75 0.63 0.01 0.01 8.00 0.66 0.01 0.02 8.25 0.69 0.01 0.02 8.50 0.73 0.02 0.03 8.75 0.76 0.03 0.04 9.00 0.81 0.03 0.05 9.25 0.85 0.04 0.05 9.50 0.89 0.05 0.06 9.75 0.94 0.07 0.07 10.00 0.99 0.08 0.08 10.25 1.05 0.10 0.10 10.50 1.12 0.12 0.13 10.75 1.20 0.15 0.16 11.00 1.29 0.19 0.21 11.25 1.41 0.24 0.29 11.50 1.55 0.31 0.41 11.75 2.12 0.64 2.13 12.00 3.64 1.75 7.23 12.25 3.88 1.94 1.02 12.50 4.04 2.07 0.67 12.75 4.15 2.16 0.49 13.00 4.24 2.24 0.41 13.25 4.32 2.31 0.36 13.50 4.39 2.37 0.31 13.75 4.45 2.42 0.28 14.00 4.50 2.46 0.25 14.25 4.55 2.51 0.23 14.50 4.60 2.55 0.22 14.75 4.64 2.58 0.21 15.00 4.69 2.62 0.20 15.25 4.73 2.65 0.19 15.50 4.76 2.69 0.18 15.75 4.80 2.72 0.16 16.00 4.83 2.75 0.15 16.25 4.86 2.77 0.15 16.50 4.89 2.80 0.14 16.75 4.92 2.82 0.14 17.00 4.95 2.85 0.13 17.25 4.98 2.87 0.13 17.50 5.01 2.90 0.13 17.75 5.03 2.92 0.12 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 5.06 2.94 0.12 18.25 5.08 2.96 0.12 18.50 5.10 2.98 0.11 18.75 5.13 3.00 0.11 19.00 5.15 3.02 0.10 19.25 5.17 3.04 0.10 19.50 5.19 3.06 0.10 19.75 5.21 3.08 0.09 20.00 5.23 3.09 0.09 Hark SWM-2 Prepared by Timmons Type/1 24-hr 10 Year Rainfall=5.49" Summary for Subcatchment 11S: Pre -Developed Area 1 Runoff = 4.20 cfs @ 12.01 hrs, Volume= 0.203 af, Depth> 1.80" Printed 4/6/2021 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 Year Rainfall=5.49" Area (ac) CN 1.350 65 Grass cover, HSG B 1.350 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/f0 (ft/sec) (cfs) 6.4 100 0.0500 0.26 Sheet Flow, Grass: Short n= 0.150 P2= 3.65" 2.5 375 0.1300 2.52 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fos 8.9 475 Total Subcatchment 11S: Pre -Developed Area 1 Hydrograph 'I 'I 'I 'I O Runoff Type 1l -24,hr 10 Year Rainfalit5.49" Runbff Areal_1.350 'ac __ r____I____ r____I____3____ r___ Runoff'lI Voflumip=0:12011 of Runoff DepthA.80" --- FIoW-Lehgty_47T Tc=8,9 Min - - - --N=65 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Hark SWM-2 Prepared by Timmons Type/1 24-hr 10 Year Rainfall=5.49" Hydrograph for Subcatchment 11S: Pre -Developed Area 1 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.35 0.00 0.00 5.25 0.37 0.00 0.00 5.50 0.39 0.00 0.00 5.75 0.41 0.00 0.00 6.00 0.44 0.00 0.00 6.25 0.46 0.00 0.00 6.50 0.49 0.00 0.00 6.75 0.52 0.00 0.00 7.00 0.54 0.00 0.00 7.25 0.57 0.00 0.00 7.50 0.60 0.00 0.00 7.75 0.63 0.00 0.00 8.00 0.66 0.00 0.00 8.25 0.69 0.00 0.00 8.50 0.73 0.00 0.00 8.75 0.76 0.00 0.00 9.00 0.81 0.00 0.00 9.25 0.85 0.00 0.00 9.50 0.89 0.00 0.00 9.75 0.94 0.00 0.00 10.00 0.99 0.00 0.00 10.25 1.05 0.00 0.00 10.50 1.12 0.00 0.00 10.75 1.20 0.00 0.01 11.00 1.29 0.01 0.03 11.25 1.41 0.02 0.06 11.50 1.55 0.04 0.11 11.75 2.12 0.17 0.64 12.00 3.64 0.83 4.18 12.25 3.88 0.96 0.88 12.50 4.04 1.05 0.51 12.75 4.15 1.11 0.36 13.00 4.24 1.17 0.30 13.25 4.32 1.22 0.26 13.50 4.39 1.26 0.23 13.75 4.45 1.30 0.21 14.00 4.50 1.33 0.19 14.25 4.55 1.36 0.17 14.50 4.60 1.39 0.16 14.75 4.64 1.42 0.16 15.00 4.69 1.45 0.15 15.25 4.73 1.47 0.14 15.50 4.76 1.50 0.13 15.75 4.80 1.52 0.12 16.00 4.83 1.54 0.12 16.25 4.86 1.56 0.11 16.50 4.89 1.58 0.11 16.75 4.92 1.60 0.11 17.00 4.95 1.62 0.10 17.25 4.98 1.64 0.10 17.50 5.01 1.66 0.10 17.75 5.03 1.67 0.09 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 5.06 1.69 0.09 18.25 5.08 1.71 0.09 18.50 5.10 1.72 0.09 18.75 5.13 1.74 0.08 19.00 5.15 1.75 0.08 19.25 5.17 1.77 0.08 19.50 5.19 1.78 0.07 19.75 5.21 1.79 0.07 20.00 5.23 1.81 0.07 Printed 4/6/2021 Hark SWM-2 Prepared by Timmons Type 1124-hr 10 Year Rainfall=5.49" Printed 4/6/2021 Summary for Subcatchment 12S: Pre -Developed Area 2 to Sheet Flow Runoff = 10.98 cfs @ 12.01 hrs, Volume= 0.530 af, Depth> 1.80" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 Year Rainfall=5.49" Area (ac) CN Description 3.480 65 Woods, HSG B 0.050 98 Paved parking, HSG B 3.530 65 Weighted Average 3.480 98.58% Pervious Area 0.050 1.42% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/f0 (ft/sec) (cfs) 6.4 100 0.0500 0.26 Sheet Flow, Grass: Short n= 0.150 P2= 3.65' 2.5 375 0.1300 2.52 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fos 8.9 475 Total Subcatchment 12S: Pre -Developed Area 2 to Sheet Flow Hydrograph 12 , Y i y 1n 10 9 7 36 4- 3- 2 7 ■Runoff ----' - Type_I1_24�hr - _ _1A Year RainfalL"_5.49" _ _ _Runoff Ared--3.530 ,ac - ---- upoff',-Volume=01,530'-,at- ----! -Runoff Depfft�..80' ----1----Flow Le1g##t_475'--- ---------'------- T'C=$'.- Fql U- ---- ----' --- ------- tN=6J- 10 11 12 13 Time (hours) Hark SWM-2 Prepared by Timmons Type 1124-hr 10 Year Rainfall=5.49" Printed 4/6/2021 Hydrograph for Subcatchment 12S: Pre -Developed Area 2 to Sheet Flow Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.35 0.00 0.00 5.25 0.37 0.00 0.00 5.50 0.39 0.00 0.00 5.75 0.41 0.00 0.00 6.00 0.44 0.00 0.00 6.25 0.46 0.00 0.00 6.50 0.49 0.00 0.00 6.75 0.52 0.00 0.00 7.00 0.54 0.00 0.00 7.25 0.57 0.00 0.00 7.50 0.60 0.00 0.00 7.75 0.63 0.00 0.00 8.00 0.66 0.00 0.00 8.25 0.69 0.00 0.00 8.50 0.73 0.00 0.00 8.75 0.76 0.00 0.00 9.00 0.81 0.00 0.00 9.25 0.85 0.00 0.00 9.50 0.89 0.00 0.00 9.75 0.94 0.00 0.00 10.00 0.99 0.00 0.00 10.25 1.05 0.00 0.00 10.50 1.12 0.00 0.00 10.75 1.20 0.00 0.03 11.00 1.29 0.01 0.07 11.25 1.41 0.02 0.15 11.50 1.55 0.04 0.28 11.75 2.12 0.17 1.67 12.00 3.64 0.83 10.92 12.25 3.88 0.96 2.30 12.50 4.04 1.05 1.33 12.75 4.15 1.11 0.94 13.00 4.24 1.17 0.80 13.25 4.32 1.22 0.69 13.50 4.39 1.26 0.61 13.75 4.45 1.30 0.54 14.00 4.50 1.33 0.48 14.25 4.55 1.36 0.45 14.50 4.60 1.39 0.43 14.75 4.64 1.42 0.41 15.00 4.69 1.45 0.39 15.25 4.73 1.47 0.37 15.50 4.76 1.50 0.35 15.75 4.80 1.52 0.33 16.00 4.83 1.54 0.31 16.25 4.86 1.56 0.29 16.50 4.89 1.58 0.28 16.75 4.92 1.60 0.28 17.00 4.95 1.62 0.27 17.25 4.98 1.64 0.26 17.50 5.01 1.66 0.25 17.75 5.03 1.67 0.25 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 5.06 1.69 0.24 18.25 5.08 1.71 0.23 18.50 5.10 1.72 0.22 18.75 5.13 1.74 0.22 19.00 5.15 1.75 0.21 19.25 5.17 1.77 0.20 19.50 5.19 1.78 0.19 19.75 5.21 1.79 0.19 20.00 5.23 1.81 0.18 Hark SWM-2 Prepared by Timmons Type 1124-hr 10 Year Rainfall=5.49" Printed 4/6/2021 Summary for Subcatchment 14S: Post -Developed Area 2 to Sheet Flow Runoff = 11.56 cfs @ 12.01 hrs, Volume= 0.557 af, Depth> 1.88" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10 Year Rainfall=5.49" Area (ac) CN Description ` 3.430 65 Woods, HSG B 0.130 98 Paved parking, HSG B 3.560 66 Weighted Average 3.430 96.35% Pervious Area 0.130 3.65% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/f0 (ft/sec) (cfs) 6.4 100 0.0500 0.26 Sheet Flow, Grass: Short n= 0.150 P2= 3.65" 2.5 375 0.1300 2.52 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fos 8.9 475 Total Subcatchment 14S: Post -Developed Area 2 to Sheet Flow Hydrograph _ _ _ ■Runoff --- --- I,-Type-0-24�lhr- 1O-Tear RairtfalC 54i9`F- ----Runbff-Arec1=1566 '66 -- ---- ----'----------------+---- Rupoff, Vo�umlp-0,5571 of T-Runoft Depth�1.88" - --F---, - - -- I----i---- JFlow Lehgth_475' --- -- ---tN 66 I I I 10 11 12 13 Time (hours) Hark SWM-2 Prepared by Timmons Type 1124-hr 10 Year Rainfall=5.49" Printed 4/6/2021 Hydrograph for Subcatchment 14S: Post -Developed Area 2 to Sheet Flow Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.35 0.00 0.00 5.25 0.37 0.00 0.00 5.50 0.39 0.00 0.00 5.75 0.41 0.00 0.00 6.00 0.44 0.00 0.00 6.25 0.46 0.00 0.00 6.50 0.49 0.00 0.00 6.75 0.52 0.00 0.00 7.00 0.54 0.00 0.00 7.25 0.57 0.00 0.00 7.50 0.60 0.00 0.00 7.75 0.63 0.00 0.00 8.00 0.66 0.00 0.00 8.25 0.69 0.00 0.00 8.50 0.73 0.00 0.00 8.75 0.76 0.00 0.00 9.00 0.81 0.00 0.00 9.25 0.85 0.00 0.00 9.50 0.89 0.00 0.00 9.75 0.94 0.00 0.00 10.00 0.99 0.00 0.00 10.25 1.05 0.00 0.00 10.50 1.12 0.00 0.02 10.75 1.20 0.01 0.05 11.00 1.29 0.01 0.10 11.25 1.41 0.03 0.18 11.50 1.55 0.05 0.32 11.75 2.12 0.19 1.84 12.00 3.64 0.88 11.51 12.25 3.88 1.01 2.40 12.50 4.04 1.11 1.38 12.75 4.15 1.17 0.98 13.00 4.24 1.23 0.83 13.25 4.32 1.28 0.71 13.50 4.39 1.32 0.63 13.75 4.45 1.36 0.56 14.00 4.50 1.40 0.50 14.25 4.55 1.43 0.46 14.50 4.60 1.46 0.44 14.75 4.64 1.49 0.42 15.00 4.69 1.52 0.40 15.25 4.73 1.54 0.38 15.50 4.76 1.57 0.36 15.75 4.80 1.59 0.34 16.00 4.83 1.61 0.32 16.25 4.86 1.63 0.30 16.50 4.89 1.65 0.29 16.75 4.92 1.67 0.29 17.00 4.95 1.69 0.28 17.25 4.98 1.71 0.27 17.50 5.01 1.73 0.26 17.75 5.03 1.75 0.26 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 5.06 1.77 0.25 18.25 5.08 1.78 0.24 18.50 5.10 1.80 0.23 18.75 5.13 1.81 0.22 19.00 5.15 1.83 0.22 19.25 5.17 1.84 0.21 19.50 5.19 1.86 0.20 19.75 5.21 1.87 0.19 20.00 5.23 1.88 0.18 Hark SWM-2 Prepared by Timmons G Type 11 24-hr 10 Year Rainfall=5.49" Summary for Pond 8P: Storage Pipes Printed 4/6/2021 Inflow Area = 1.350 ac, 44.44% Impervious, Inflow Depth > 3.09" for 10 Year event Inflow = 7.62 cfs @ 11.97 hrs, Volume= 0.347 of Outflow = 4.03 cfs @ 12.06 hrs, Volume= 0.331 af, Atten= 47%, Lag= 5.7 min Primary = 4.03 cfs @ 12.06 hrs, Volume= 0.331 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs / 2 Peak Elev= 643.03' @ 12.06 hrs Surf.Area= 0.014 ac Storage= 0.116 of Plug -Flow detention time= 70.9 min calculated for 0.331 of (95% of inflow) Center -of -Mass det. time= 53.1 min ( 829.0 - 775.9) Volume Invert Avail.Storage Storage Description #1 637.50' 0.120 of 72.0" Round Pipe Storage L= 185.0' Device Routing Invert Outlet Devices #1 Primary 637.50' 2.5" Vert. Orifice/Grate C= 0.600 #2 Primary 640.50' 12.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 #3 Primary 643.00' 4.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=3.96 cfs @ 12.06 hrs HW=642.96' (Free Discharge) �1=Orifice/Grate (Orifice Controls 0.38 cfs @ 11.15 fps) 2=Orifice/Grate (Orifice Controls 3.58 cfs @ 7.16 fps) 3=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) N u Pond 8P: Storage Pipes Hydrograph Time (hours) ❑ Inflow ❑ Primary Hark SWM-2 Type/1 24-hr 10 Year Rainfall=5.49" Prepared by Timmons Group Printed 4/6/2021 Pond 8P: Storage Pipes Stage -Discharge Sharp -Crested Rectangular Weir 642 I I I I m 641 ., /� Grat_tl O _ 640 III� IIIII Wt _IIIIrIII yIIIIIIIII 70rifice/Grate 639 638 0 1 2 3 4 5 6 7 8 Discharge (cfs) Pond 8P: Storage Pipes Stage -Area -Storage I I I I I I I I I I I I I I I I I I I I I I 643 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 64Q I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 641 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I C I I I I I I I I I I I I I I I I I I I O I I I I I I I I I I I I I I I I I I I d 640 I I I I I I I I I I I I I I I I W I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I i i i I I I I I I I I I I I I I I I I I I I I I I I I I I i 639 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 638 I I I I I I I I I I I I I I I I I I I I I Pipe Storage 0 0.0050.010.0150.020.0250.030.0350.040.0450.050.0550.060.0650.070.0750.080.0850.090.0950.1 0.1050.110.1150.11 Storage (acre-feet) ❑ Primary ■ Storage Hark SWM-2 Prepared by Timmons Type/1 24-hr 10 Year Rainfall=5.49" Printed 4/6/2021 Hydrograph for Pond 813: Storage Pipes Time Inflow Storage Elevation Primary (hours) (cfs) (acre-feet) (feet) (cfs) 5.00 0.00 0.000 637.50 0.00 5.50 0.00 0.000 637.50 0.00 6.00 0.00 0.000 637.50 0.00 6.50 0.00 0.000 637.50 0.00 7.00 0.00 0.000 637.51 0.00 7.50 0.01 0.000 637.56 0.01 8.00 0.02 0.000 637.58 0.01 8.50 0.03 0.001 637.62 0.02 9.00 0.05 0.001 637.66 0.04 9.50 0.06 0.001 637.70 0.05 10.00 0.08 0.002 637.76 0.06 10.50 0.13 0.003 637.87 0.08 11.00 0.21 0.006 638.08 0.11 11.50 0.41 0.013 638.47 0.15 12.00 7.23 0.107 642.49 3.53 12.50 0.67 0.070 640.88 1.06 13.00 0.41 0.064 640.65 0.47 13.50 0.31 0.062 640.57 0.35 14.00 0.25 0.060 640.51 0.29 14.50 0.22 0.058 640.43 0.28 15.00 0.20 0.056 640.33 0.27 15.50 0.18 0.052 640.19 0.26 16.00 0.15 0.048 640.04 0.26 16.50 0.14 0.044 639.86 0.25 17.00 0.13 0.040 639.69 0.24 17.50 0.13 0.035 639.52 0.23 18.00 0.12 0.031 639.35 0.22 18.50 0.11 0.027 639.18 0.21 19.00 0.10 0.024 639.01 0.19 19.50 0.10 0.020 638.84 0.18 20.00 0.09 0.016 638.67 0.17 Hark SWM-2 Prepared by Timmons Elevation Primary (feet) (cfs) 637.50 0.00 637.54 0.00 637.58 0.01 637.62 0.02 637.66 0.04 637.70 0.05 637.74 0.06 637.78 0.07 637.82 0.08 637.86 0.08 637.90 0.09 637.94 0.10 637.98 0.10 638.02 0.11 638.06 0.11 638.10 0.12 638.14 0.12 638.18 0.12 638.22 0.13 638.26 0.13 638.30 0.14 638.34 0.14 638.38 0.14 638.42 0.15 638.46 0.15 638.50 0.16 638.54 0.16 638.58 0.16 638.62 0.17 638.66 0.17 638.70 0.17 638.74 0.17 638.78 0.18 638.82 0.18 638.86 0.18 638.90 0.19 638.94 0.19 638.98 0.19 639.02 0.20 639.06 0.20 639.10 0.20 639.14 0.20 639.18 0.21 639.22 0.21 639.26 0.21 639.30 0.21 639.34 0.22 639.38 0.22 639.42 0.22 639.46 0.22 639.50 0.23 639.54 0.23 Type/1 24-hr 10 Year Rainfall=5.49" Stage -Discharge for Pond 8P: Storage Pipes Elevation Primary (feet) (cfs) 639.58 0.23 639.62 0.23 639.66 0.24 639.70 0.24 639.74 0.24 639.78 0.24 639.82 0.24 639.86 0.25 639.90 0.25 639.94 0.25 639.98 0.25 640.02 0.26 640.06 0.26 640.10 0.26 640.14 0.26 640.18 0.26 640.22 0.27 640.26 0.27 640.30 0.27 640.34 0.27 640.38 0.27 640.42 0.28 640.46 0.28 640.50 0.28 640.54 0.31 640.58 0.36 640.62 0.42 640.66 0.49 640.70 0.58 640.74 0.67 640.78 0.77 640.82 0.88 640.86 0.99 640.90 1.11 640.94 1.24 640.98 1.37 641.02 1.50 641.06 1.60 641.10 1.70 641.14 1.78 641.18 1.87 641.22 1.94 641.26 2.02 641.30 2.08 641.34 2.15 641.38 2.22 641.42 2.28 641.46 2.34 641.50 2.40 641.54 2.46 641.58 2.51 641.62 2.57 Elevation Primary (feet) (cfs) 641.66 2.62 641.70 2.67 641.74 2.72 641.78 2.77 641.82 2.82 641.86 2.87 641.90 2.92 641.94 2.96 641.98 3.01 642.02 3.05 642.06 3.10 642.10 3.14 642.14 3.18 642.18 3.23 642.22 3.27 642.26 3.31 642.30 3.35 642.34 3.39 642.38 3.43 642.42 3.47 642.46 3.51 642.50 3.55 642.54 3.58 642.58 3.62 642.62 3.66 642.66 3.69 642.70 3.73 642.74 3.77 642.78 3.80 642.82 3.84 642.86 3.87 642.90 3.91 642.94 3.94 642.98 3.97 643.02 4.04 643.06 4.23 643.10 4.49 643.14 4.79 643.18 5.13 643.22 5.51 643.26 5.91 643.30 6.35 643.34 6.82 643.38 7.30 643.42 7.81 643.46 8.35 643.50 8.90 Printed 4/6/2021 Hark SWM-2 Prepared by Timmons Elevation Storage (feet) (acre-feet) 637.50 0.000 637.54 0.000 637.58 0.000 637.62 0.001 637.66 0.001 637.70 0.001 637.74 0.002 637.78 0.002 637.82 0.002 637.86 0.003 637.90 0.003 637.94 0.004 637.98 0.005 638.02 0.005 638.06 0.006 638.10 0.006 638.14 0.007 638.18 0.008 638.22 0.008 638.26 0.009 638.30 0.010 638.34 0.010 638.38 0.011 638.42 0.012 638.46 0.012 638.50 0.013 638.54 0.014 638.58 0.015 638.62 0.015 638.66 0.016 638.70 0.017 638.74 0.018 638.78 0.019 638.82 0.020 638.86 0.020 638.90 0.021 638.94 0.022 638.98 0.023 639.02 0.024 639.06 0.025 639.10 0.026 639.14 0.027 639.18 0.028 639.22 0.028 639.26 0.029 639.30 0.030 639.34 0.031 639.38 0.032 639.42 0.033 639.46 0.034 639.50 0.035 639.54 0.036 Type/1 24-hr 10 Year Rainfall=5.49" Stage -Area -Storage for Pond 8P: Storage Pipes Elevation Storage (feet) (acre-feet) 639.58 0.037 639.62 0.038 639.66 0.039 639.70 0.040 639.74 0.041 639.78 0.042 639.82 0.043 639.86 0.044 639.90 0.045 639.94 0.046 639.98 0.047 640.02 0.048 640.06 0.049 640.10 0.050 640.14 0.051 640.18 0.052 640.22 0.053 640.26 0.054 640.30 0.055 640.34 0.056 640.38 0.057 640.42 0.058 640.46 0.059 640.50 0.060 640.54 0.061 640.58 0.062 640.62 0.063 640.66 0.064 640.70 0.065 640.74 0.066 640.78 0.067 640.82 0.068 640.86 0.069 640.90 0.070 640.94 0.071 640.98 0.072 641.02 0.073 641.06 0.074 641.10 0.075 641.14 0.076 641.18 0.077 641.22 0.078 641.26 0.079 641.30 0.080 641.34 0.081 641.38 0.082 641.42 0.083 641.46 0.084 641.50 0.085 641.54 0.086 641.58 0.087 641.62 0.088 Elevation Storage (feet) (acre-feet) 641.66 0.089 641.70 0.090 641.74 0.091 641.78 0.092 641.82 0.093 641.86 0.093 641.90 0.094 641.94 0.095 641.98 0.096 642.02 0.097 642.06 0.098 642.10 0.099 642.14 0.100 642.18 0.100 642.22 0.101 642.26 0.102 642.30 0.103 642.34 0.104 642.38 0.105 642.42 0.105 642.46 0.106 642.50 0.107 642.54 0.108 642.58 0.108 642.62 0.109 642.66 0.110 642.70 0.111 642.74 0.111 642.78 0.112 642.82 0.113 642.86 0.113 642.90 0.114 642.94 0.114 642.98 0.115 643.02 0.116 643.06 0.116 643.10 0.117 643.14 0.117 643.18 0.118 643.22 0.118 643.26 0.118 643.30 0.119 643.34 0.119 643.38 0.120 643.42 0.120 643.46 0.120 643.50 0.120 Printed 4/6/2021 Hark SWM-2 Prepared by Timmons Type/1 24-hr 10 Year Rainfall=5.49" Printed 4/6/2021 Summary for Link 5L: Outfall Inflow Area = 1.350 ac, 44.44% Impervious, Inflow Depth > 2.94" for 10 Year event Inflow = 4.03 cfs @ 12.06 hrs, Volume= 0.331 of Primary = 4.03 cfs @ 12.06 hrs, Volume= 0.331 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 5L: Outfall Hydrograph ■ Inflow ■ Primary Time (hours) Hark SWM-2 Prepared by Timmons Type/1 24-hr 10 Year Rainfall=5.49" Hydrograph for Link 5L: Ouffall Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 5.00 0.00 0.00 0.00 5.25 0.00 0.00 0.00 5.50 0.00 0.00 0.00 5.75 0.00 0.00 0.00 6.00 0.00 0.00 0.00 6.25 0.00 0.00 0.00 6.50 0.00 0.00 0.00 6.75 0.00 0.00 0.00 7.00 0.00 0.00 0.00 7.25 0.00 0.00 0.00 7.50 0.01 0.00 0.01 7.75 0.01 0.00 0.01 8.00 0.01 0.00 0.01 8.25 0.02 0.00 0.02 8.50 0.02 0.00 0.02 8.75 0.03 0.00 0.03 9.00 0.04 0.00 0.04 9.25 0.05 0.00 0.05 9.50 0.05 0.00 0.05 9.75 0.06 0.00 0.06 10.00 0.06 0.00 0.06 10.25 0.07 0.00 0.07 10.50 0.08 0.00 0.08 10.75 0.10 0.00 0.10 11.00 0.11 0.00 0.11 11.25 0.13 0.00 0.13 11.50 0.15 0.00 0.15 11.75 0.21 0.00 0.21 12.00 3.53 0.00 3.53 12.25 2.70 0.00 2.70 12.50 1.06 0.00 1.06 12.75 0.60 0.00 0.60 13.00 0.47 0.00 0.47 13.25 0.40 0.00 0.40 13.50 0.35 0.00 0.35 13.75 0.32 0.00 0.32 14.00 0.29 0.00 0.29 14.25 0.28 0.00 0.28 14.50 0.28 0.00 0.28 14.75 0.27 0.00 0.27 15.00 0.27 0.00 0.27 15.25 0.27 0.00 0.27 15.50 0.26 0.00 0.26 15.75 0.26 0.00 0.26 16.00 0.26 0.00 0.26 16.25 0.25 0.00 0.25 16.50 0.25 0.00 0.25 16.75 0.24 0.00 0.24 17.00 0.24 0.00 0.24 17.25 0.23 0.00 0.23 17.50 0.23 0.00 0.23 17.75 0.22 0.00 0.22 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 18.00 0.22 0.00 0.22 18.25 0.21 0.00 0.21 18.50 0.21 0.00 0.21 18.75 0.20 0.00 0.20 19.00 0.19 0.00 0.19 19.25 0.19 0.00 0.19 19.50 0.18 0.00 0.18 19.75 0.18 0.00 0.18 20.00 0.17 0.00 0.17 Printed 4/6/2021 DEQ Virginia Runoff Reduction Method Re-Developm 112011 BMP Standards and Specifications 02013 Draft BMP Standards and Specifications Project Name: Hark Vinyard Date: 2/2/2021 Linear Development Project? No Site Information Post -Development Project (Treatment Volume and Loads) Enter Total Disturbed Area (acres) eDevelopment land Cover (acres( data input cans constant values calcula0on cells Linearparr No Land cover areas entered correctly? Total disturbed area entered? A soils Bsoils Csoils DSoils Totals 'Open Space (acres)- undisturbed open space o.ao ad Turt (acres) -- restated, graded for r other turf to be mowed/managed 4.83 4.83 lops Cover (aces) 0.05 0.05 4.88 Development Land Cover (acres( A Soils BSoils Csoils DSoils Totals 'Open Spare (acres)-- undisturbed, 'ad forestlopen space orreforested lane 0.00 ad Tud (acres)-- retained, rtained, graded for r other turf to be moed/man ed w 4.08 9.08 lous eoaer (arras) 0.80 0.80 Area Check OK. OK. OK. OK. 4.88 :ants Runoff Coefficients Rv Rainfall (inches) 43 1 ASolls BSoils Csoils Dsoils Rainfall Event (inches) 1.00 ForesVOpen Space 0.02 0.03 0.D4 0.05 hosphorus[TP) EMC(mg/L) 0.26 Managed Turf 0.15 0.20 0.22 0.25 itrogen(TN) EMC(mg/L) 1.86 Impervious Cover 0.95 0.95 0.95 0.95 TP Load (lb/acre/,) OAl less correction favor) 0.90 iIND COVER SUMMARY -- PRE -REDEVELOPMENT LAND COVER SUMMARY POST DE Land Cover Summary -Pre Land Co., summary-Post(Final) Land Cover Summary-Posr Pre-ReDerelopment Upped Adjusted' Port Race, &New Imperious Post-ReDeMic,ament Forest/Open Space Cover(acres) 0.00 am Fmiat/Open Space Cover (acres) 000 Foreabi Space Cover(acres) 0.00 Weighted Rv(farest) 0.00 0.00 Weighted Rv(trest) 1 0.00 Weighted Bahama) OAO %Forest 0% 0% %Fares[ 1 0% %Forest 0% Managed Tuff Cover (acres) 4.83 4.08 Managed Tuff Cover 408 Managed Turt Cover 4.08 (acres) (acres) Weighted Rv(trt) 0.20 0.20 Weighted Rv(tui 0.20 Weighted Rx ani 0.20 Is Managed Tuff 99% 99% is Managed Turt 84% %Managed Tuff 99% Impervious Cover (acres) 0.05 0.05 Impervious Cover am Recent. Impervious OAS (acres) Cover (am.) Rv(impervious) 0.95 0.95 Rv(impervices) 0.95 "impervious) 0.95 %Impervious 1% 1% %Impervious 16% %Impervious 1% Total Site Area (acres) 4.88 4.13 Final Site Area (acres) 4.88 Site go 0.21 0.21 Final Post Dear Site Rv 0.32 Treatment Volume and Nutrient Load Final Posh Pre-ReDevelopment Treatment Volume 0.0895 O.OJ20 Development 0.1313 (acrai Treatment Volume (acre-ft) Final Posh Pre-ReDevelopment Treatment Volume 3,679 3,135 Development 5,721 (cubic feet) Treatment Volume (mbicfeet) Pre-ReOevelopment TP Load Final Poi 2.31 1.97 * Development TP Load 3.59 (lb/Tr) lib/yr) Pr"eDevelopment TP Loatl per acre Final Pml-Ilevelopment TP (lb/acre/Yr) 0.0] o.EB Load per arm 0.]4 (Ib/aue/Yr) Baseline TP Load abi el lba/auei applied to pre- redevelopment area excluding pervious 1.69 land proposed for new impervious cover) turned Land Cover Summary: Re,Develapment land cower minus pervious land cover pdre.Vdpen spare or raged turf) acreage propmedfor new impervious cover. useedtotal acreage is consistent with Past-ReDevelopment acreage (minus edge 7new impervious cover). con I shows mad reduction requdementf rnew impervious cover asused on new elopmentload limit 0.41 ms/acre/yexi Total ReDay. SKe Area 413 (acres) ReDev9 Rv 0.21 Treatment Volume and Nutrient Load TP Wad Reduction Required (lbi 1 1.59 a part-Reoevelapment TreatmentVolume OA720 (acre-h) Port -Re levelopmem Tmamen Volume 35 lNGehpt) Port-ReDevelop n Load nai 197 0b/Yr)• Part-Reaevelagnent TP Lord per acre (Ib/ave/w) Max. Reduction Required audow Pre- zo% ReDe¢elopment Load) To Load Reduction Required for Redeveloped Area 0'28 (Ib/Trl eduction below new development I mitnnonfmtrequired Land Cover summory-Post Past -Development New Impervious New Impervious Cover 0.75 (acres) Rv(impervious) 0.95 Port -Development TreatmentValume 010i (acnI Post -Development Treatment Volume (cubic feat) Port -Load gPmantlP 1b9 Load (Ib/yr) TP Load Reduction Required for New 1.32