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HomeMy WebLinkAboutWPO202000007 Calculations 2021-05-21HARK VINEYARDS ALBEMARLE COUNTY, VIRGINIA WHITE HALL DISTRICT DESIGN CALCULATIONS & NARRATIVE WPO 2020-00007 FEBRUARY 5, 2021 REVISED: MAY 21, 2021 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 44 ATH:1\' X SHOULTER y I .Ic. No. 0402057151 05/21 /202 1 No.- r1.VAl ��. 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 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 The existing site is a grass area that sheet flows downhill to the southwest. The proposed development will return the majority of the disturbed area (Area 2) to sheet flow without a significant change in CN or sheet flow volume fulfilling the requirements of section 9VAC25-970-66 Section D. Area 1 of the site that will have a significant increase in impervious area and the flow will be concentrated in the post developed condition. Therefore this flow will be detained in accordance with section 9VAC-970-66 Section B and C for Channel and Flood Protection. FORM LD' STOBMWATEH INLET COMPUTATIONS SHEET OF PROJECT HARK VINEYARD DESIGNER: A.MABEE DATE SWMI CHECKED: J. SHOWALTER UNITS 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: WIVZU1 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: J. SHOWALTER UNITS ENGLISN DRALY, RUNOFF CA TOTAL RAW RUNOFF IN TELEVATIONS LENGTH MOM SIZE SHAPE Nami- Capai Fmdan NORMAL FLOW FLOW IN R ACCGM- Ue od T.WQ UPPER LOWER Depl6al A aal Hm V. Pn PWE FROMPOM TO POI MP AREA COEFF. WLET FALL ofR,, (Du. O` ofmi Slope TRrIE REFERENCE STA. REFERENCH STA. NO, "A' "C" MENT ULATED TL END END Span/Rice) Flow,& Flow, Aa REMARKS Acre M1Gnures WHr CFS CFS FL FlI , la CFS PIn Ft SqF[ Ft Fd ec Ft Sec. 1 2 3 (0 (5 6 (9 8 (9 (10 11 12 13 (16 IS (16 19) 18) 101 102 100 O.W 0.00 no 5.12 5%5 0.01 15] 61970 599.52 239.05 OM" 15 Gmalm 1 20.40 0.01050 020 DA6 Ol0 9.84 170 NA2 r=^aom wiN 2Y-Flow 103 STORAGE 102 O.W 0.01 005 SW 566 001 15] 63]50 6M.M 83.15 0.1050115 Ci-I.1 26.65 0010500.21 DA3 DA3 11.89 240 7.00 ro `aoae wpm 2 Y-Flow r= &-wiN 101 102 100 O.W 0.01 005 509 586 001 4A3 620.89 599.52 237.05 O.ONCO 15 Ci-I. 1 20.W 0.01350 0.3] 0.31 0.21 13.2➢ 308 IT9 JOY -Flow ro �aoae wim 103 STORAGE 102 0.00 0.01 005 SW 5.66 001 4A3 63750 6M.M 83.15 0.1050115 Ci-I.1 26.65 0013500.33 0.26 DA9 15.66 0.10 1,31 IO Year Flow 111 112 STORAGE 0.06 085 0.05 0,19 SW 5]0 0.00 1.10 66356 612.M I25 009959 12 Ci w. 1 12,18 O.OW90 020 0,11 0.12 %63 160 127 113 116 in 0.06 DO 0.03 0,16 5% 5]8 0.00 081 6U,61 613]5 4292 0@ 12 Ci . 1 5A6 0.01050 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 79N 0.01936 12 Ci w. 1 5A5 &00030 024 0,16 0.16 6.69 058 1689 121 122 STORAGE DAI 063 0.26 OW 533 5]9 &00 291 63961 632.80 163.66 0.OI0M IS Ci w. 1 701 0.00180 056 056 0.29 5A5 102 3005 123 IN in 0.29 007 0.10 0,16 501 589 &00 080 640.06 639.29 nllM 0.01937 12 Ci w. 1 3.85 &00040 031 021 0.18 3.88 O50 19W 131 132 in 0.12 089 0.11 0,11 501 589 0.00 063 641,07 639.60 73.48 D.%IDI 12 Ci . 1 5A6 &00030 023 0,16 0.16 6.60 056 1S84 11-34] HYDRAULIC GRADE LINE ANALYSIS INCIDENCE PROBABILITY 10 Year PROJECT: HARK VINEYARDS DESIGNED BY: Checked: A. MABEE J. SHOWALTER IMET OR JUNCTION STA. INVERT EL. OUTFLOW PIPE DEPTH OFFLOW OUTFLOW PIPE OUTLET WATER SURFACE Et V. DW PIPE Do INmm DESIGN DISCH, Co CFMMS LENGTH PIPE Lo FUN FRICTION SLOPE, Sb (FMFT) FRICTION LOSS Hf FW JUNCTION LOSS SURFACE ELMHt JFWYM OS FVM FINAL H RRA Inkl Water SMace Emeubun Tcpd MH Tcp of Inlet EIN. APPROk A4umnam Vo Cmtr. Ho RUN) V. V.] g Hi(apn) O.35' . V' SKEW Angle K BUM H F Sum HL F 1 2 3 d 5 6 8 9 10 11 12 13 16 15 16 1] 18 1910D 600.T10102 599.520 1.25 600.M 15 1.5]0 23].45 0.00053 0.125 9.843 0.3]6 11.886 2.194 0.768 0.0 0.00 0.000 1.144 0.000 0.5]2 0.69] 619.935 628.950 O.K. STORAGE 625.440 1.25 626A40 15 1.5]0 83.15 0.00053 0.044 11.886 0.548 5.446 0.461 0.161 0.0 0.00 0.000 0.710 0.000 0.355 0.399 637.706 643.500 O.K. 122 637.800 125 638.800 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 0250 1.496 0.325 YES 0.163 0.459 640.002 643.500 O.K. 124 639.290 1.00 640.090 12 0.800 ]].25 0.00045 0.035 3.875 0.058 0.0D0 GOOD 0.000 0.0 0.00 0.000 0.058 0.800 0.076 YES 0.038 0.073 640.369 643.610 O.K. 112 642.340 1.00 643.140 12 1.102 12.25 0.00085 0.010 9.634 0.360 0.0D0 GOOD 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 0.12 00.0 0.00 0.000 0216 0.150 0.216 YES 0.108 0.128 644.8]0 650.500 O.K. 116 646.710 1.00 645.510 12 0.659 79.24 0.00030 0.024 4.693 0.085 0.0D0 GOOD 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 1.00 640.400 12 0.630 73.48 0.00028 0.020 4.639 0.064 0.OD0 0.000 0.000 0.0 0.00 0.000 0.084 0.630 0.109 NO 0.109 0.129 641.299 645.110 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 2S 8P 5L 1OS Post -Developed Area 1 Storage Pipes Modified Outfall Pre -Developed Area 1 Routed Design 3" Minimum Orifice 8S -0 gP 11 L Post -Developed Area 1 Storage Pipes Original Outfall Routed Design 2.5' Orifice to Meet Energy Balance 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 5/20/2021 FHydroCADO10.00-20 stn 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 (I OS) 1.500 65 Grass, HSG B (2S, 8S) 1.380 98 Paved parking, HSG B (2S, 8S, 12S, 14S) 6.910 65 Woods, HSG B (I 2S, 14S) 11.140 69 TOTAL AREA Printed 5/20/2021 Hark SWM-2 Prepared by Timmons Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 11.140 HSG B 2S, 8S, 10S, 12S, 14S 0.000 HSG C 0.000 HSG D 0.000 Other 11.140 TOTAL AREA Printed 5/20/2021 Hark SWM-2 Prepared by Timmons Ground Covers (all nodes) Printed 5/20/2021 HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 1.500 0.000 0.000 0.000 1.500 Grass 2S, 8S 0.000 1.350 0.000 0.000 0.000 1.350 Grass cover 10S 0.000 1.380 0.000 0.000 0.000 1.380 Paved parking 2S, 8S, 12S, 14S 0.000 6.910 0.000 0.000 0.000 6.910 Woods 12S, 14S 0.000 11.140 0.000 0.000 0.000 11.140 TOTAL AREA Hark SWM-2 Prepared by Timmons G Type 11 24-hr 1 Year Rainfall=3.02" Printed 5/20/2021 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 8S: 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 10S: 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 8P: Storage Pipes Modified Design 3" Peak EIev=640.20' Storage=0.052 of Inflow=2.98 cfs 0.130 of Outflow=0.38 cfs 0.129 of Pond 913: Storage Pipes Original Design 2.5" Peak EIev=640.42' Storage=0.058 of Inflow=2.98 cfs 0.130 of Outflow=0.28 cfs 0.129 of Link 5L: Outfall Link 11 L: Outfall Inflow=0.38 cfs 0.129 of Primary=0.38 cfs 0.129 of Inflow=0.28 cfs 0.129 of Primary=0.28 cfs 0.129 of Total Runoff Area = 11.140 ac Runoff Volume = 0.586 of Average Runoff Depth = 0.63" 87.61 % Pervious = 9.760 ac 12.39% Impervious =1.380 ac Hark SWM-2 Prepared by Timmons Type/1 24-hr 1 Year Rainfall=3.02" Printed 5/20/2021 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 5/20/2021 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 Type/1 24-hr 1 Year Rainfall=3.02" Printed 5/20/2021 Summary for Subcatchment 8S: 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 8S: 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 5/20/2021 Hydrograph for Subcatchment 8S: 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 5/20/2021 Summary for Subcatchment 10S: 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 10S: 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 10S: 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 5/20/2021 Hark SWM-2 Prepared by Timmons Type/1 24-hr 1 Year Rainfall=3.02" Printed 5/20/2021 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 5/20/2021 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 Type/1 24-hr 1 Year Rainfall=3.02" Printed 5/20/2021 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/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 Hydrogreph C 2 I N ' 'I 'I _o LL I 10 11 12 13 Time (hours) ' ' ' ' 'I 'I 'I ■Runoff Type 11 24,1hr 1 Year Rainfa11�3.02" ]Runoff Are6=3.560-'ac Runoff'I Vol'lume_0:11144''I of Runoff Depth-0.48" FloW Lehgth-475' +-- Tc=8,9 Mm- tN=66 Hark SWM-2 Prepared by Timmons Type/1 24-hr 1 Year Rainfall=3.02" Printed 5/20/2021 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 5/20/2021 Summary for Pond 8P: Storage Pipes Modified Design 3" Minimum Orifice 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 = 0.38 cfs @ 12.34 hrs, Volume= 0.129 af, Atten= 87%, Lag= 21.6 min Primary = 0.38 cfs @ 12.34 hrs, Volume= 0.129 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs / 2 Peak Elev= 640.20' @ 12.34 hrs Surf.Area= 0.025 ac Storage= 0.052 of Plug -Flow detention time= 61.1 min calculated for 0.129 of (99% of inflow) Center -of -Mass det. time= 58.4 min ( 855.4 - 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' 3.0" Vert. Orifice/Grate C= 0.600 #2 Primary 640.25' 12.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 #3 Primary 642.75' 4.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=0.38 cfs @ 12.34 hrs HW=640.20' (Free Discharge) �1=Orifice/Grate (Orifice Controls 0.38 cfs @ 7.72 fps) 2=Orifice/Grate ( Controls 0.00 cfs) 3=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) N u Pond 8P: Storage Pipes Modified Design 3" Minimum Orifice Hydrograph Time (hours) ❑ Inflow -11 ❑ Primary Hark SWM-2 Prepared by Timmons 641 c m 640 w 639 638 I a 0 m d W Type/1 24-hr 1 Year Rainfall=3.02" Printed 5/20/2021 Pond 8P: Storage Pipes Modified Design 3" Minimum Orifice Stage -Discharge it 1---- !--- - _J_ Orifice Orifice/Grate , Discharge (cfs) )ctangular Weir i _L____ 1____!____J____ Pond 8P: Storage Pipes Modified Design 3" Minimum Orifice Stage -Area -Storage i --jPipe Storage . . 1050.010.0150.020.0250.030.0350.040.0450.050.0550.060.0650.070.0750.080.0850.090.095 0.1 0.1050.110.1150.1 £ Storage (acre-feet) ■ Primary ■ Storage Hark SWM-2 Prepared by Timmons Type/1 24-hr 1 Year Rainfall=3.02" Printed 5/20/2021 Hydrograph for Pond 8P: Storage Pipes Modified Design 3" Minimum Orifice 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 0.001 637.62 0.03 11.50 0.10 0.001 637.71 0.07 12.00 2.86 0.037 639.58 0.33 12.50 0.29 0.052 640.17 0.38 13.00 0.18 0.045 639.93 0.36 13.50 0.14 0.038 639.61 0.33 14.00 0.11 0.030 639.27 0.30 14.50 0.10 0.022 638.93 0.27 15.00 0.09 0.015 638.61 0.24 15.50 0.08 0.010 638.32 0.20 16.00 0.07 0.006 638.06 0.16 16.50 0.06 0.003 637.85 0.11 17.00 0.06 0.002 637.73 0.08 17.50 0.06 0.001 637.70 0.06 18.00 0.05 0.001 637.68 0.06 18.50 0.05 0.001 637.68 0.05 19.00 0.05 0.001 637.67 0.05 19.50 0.04 0.001 637.66 0.05 20.00 0.04 0.001 637.65 0.04 Hark SWM-2 Prepared by Timmons Type/1 24-hr 1 Year Rainfall=3.02" Printed 5/20/2021 Stage -Discharge for Pond 8P: Storage Pipes Modified Design 3" Minimum Orifice Elevation Primary (feet) (cfs) 637.50 0.00 637.54 0.00 637.58 0.01 637.62 0.03 637.66 0.05 637.70 0.06 637.74 0.08 637.78 0.09 637.82 0.10 637.86 0.11 637.90 0.12 637.94 0.13 637.98 0.14 638.02 0.15 638.06 0.16 638.10 0.16 638.14 0.17 638.18 0.18 638.22 0.18 638.26 0.19 638.30 0.19 638.34 0.20 638.38 0.21 638.42 0.21 638.46 0.22 638.50 0.22 638.54 0.23 638.58 0.23 638.62 0.24 638.66 0.24 638.70 0.25 638.74 0.25 638.78 0.25 638.82 0.26 638.86 0.26 638.90 0.27 638.94 0.27 638.98 0.28 639.02 0.28 639.06 0.28 639.10 0.29 639.14 0.29 639.18 0.29 639.22 0.30 639.26 0.30 639.30 0.31 639.34 0.31 639.38 0.31 639.42 0.32 639.46 0.32 639.50 0.32 639.54 0.33 Elevation Primary (feet) (cfs) 639.58 0.33 639.62 0.33 639.66 0.34 639.70 0.34 639.74 0.34 639.78 0.35 639.82 0.35 639.86 0.35 639.90 0.36 639.94 0.36 639.98 0.36 640.02 0.37 640.06 0.37 640.10 0.37 640.14 0.37 640.18 0.38 640.22 0.38 640.26 0.39 640.30 0.42 640.34 0.48 640.38 0.54 640.42 0.62 640.46 0.71 640.50 0.80 640.54 0.90 640.58 1.01 640.62 1.13 640.66 1.25 640.70 1.38 640.74 1.52 640.78 1.64 640.82 1.74 640.86 1.84 640.90 1.92 640.94 2.00 640.98 2.08 641.02 2.15 641.06 2.22 641.10 2.29 641.14 2.36 641.18 2.42 641.22 2.48 641.26 2.54 641.30 2.60 641.34 2.65 641.38 2.71 641.42 2.76 641.46 2.81 641.50 2.87 641.54 2.92 641.58 2.97 641.62 3.01 Elevation Primary (feet) (cfs) 641.66 3.06 641.70 3.11 641.74 3.16 641.78 3.20 641.82 3.25 641.86 3.29 641.90 3.33 641.94 3.38 641.98 3.42 642.02 3.46 642.06 3.50 642.10 3.54 642.14 3.58 642.18 3.62 642.22 3.66 642.26 3.70 642.30 3.74 642.34 3.78 642.38 3.81 642.42 3.85 642.46 3.89 642.50 3.92 642.54 3.96 642.58 4.00 642.62 4.03 642.66 4.07 642.70 4.10 642.74 4.14 642.78 4.24 642.82 4.45 642.86 4.71 642.90 5.02 642.94 5.38 642.98 5.76 643.02 6.18 643.06 6.62 643.10 7.09 643.14 7.59 643.18 8.11 643.22 8.64 643.26 9.20 643.30 9.78 643.34 10.37 643.38 10.99 643.42 11.61 643.46 12.26 643.50 12.92 Hark SWM-2 Prepared by Timmons Type/1 24-hr 1 Year Rainfall=3.02" Printed 5/20/2021 Stage -Area -Storage for Pond 8P: Storage Pipes Modified Design 3" Minimum Orifice 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 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 Hark SWM-2 Prepared by Timmons G Type 11 24-hr 1 Year Rainfall=3.02" Printed 5/20/2021 Summary for Pond 9P: Storage Pipes Original Design 2.5" Orifice to Meet Energy Balance 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) 2 N u Pond 9P: Storage Pipes Original Design 2.5" Orifice to Meet Energy Balance Hydrograph Time (hours) ❑ Inflow -11 ❑ Primary Hark SWM-2 Prepared by Timmons Type/1 24-hr 1 Year Rainfall=3.02" Printed 5/20/2021 Pond 9P: Storage Pipes Original Design 2.5" Orifice to Meet Energy Balance Stage -Discharge ■ Primary 4 5 Discharge (cfs) Pond 9P: Storage Pipes Original Design 2.5" Orifice to Meet Energy Balance Stage -Area -Storage i i i i i i i i i i i i i i i i i i i ■ Storage 641 i 639 Pipe Storage 0 0.0050.010.0150.020.0250.030.0350.040.0450.050.0550.060.0650.070.0750.080.0850.090.0950.1 0.1050.110.1150.12 Storage (acre-feet) Hark SWM-2 Prepared by Timmons Type/1 24-hr 1 Year Rainfall=3.02" Printed 5/20/2021 Hydrograph for Pond 9P: Storage Pipes Original Design 2.5" Orifice to Meet Energy Balance 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 Type/1 24-hr 1 Year Rainfall=3.02" Printed 5/20/2021 Stage -Discharge for Pond 913: Storage Pipes Original Design 2.5" Orifice to Meet Energy Balance 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 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 Hark SWM-2 Prepared by Timmons Type/1 24-hr 1 Year Rainfall=3.02" Printed 5/20/2021 Stage -Area -Storage for Pond 913: Storage Pipes Original Design 2.5" Orifice to Meet Energy Balance 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 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 Hark SWM-2 Prepared by Timmons Type/1 24-hr 1 Year Rainfall=3.02" Printed 5/20/2021 Summary for Link 5L: Outfall Inflow Area = 1.350 ac, 44.44% Impervious, Inflow Depth > 1.15' for 1 Year event Inflow = 0.38 cfs @ 12.34 hrs, Volume= 0.129 of Primary = 0.38 cfs @ 12.34 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 ---+--------r-----------r-----------*-----------+--- ----r--- ■Inflow 0.42 --- r-------- r------- ----r- aaa as r____1_ r____I_ 1- - ----- ------r--- Primary 0.4 ;��, ------;----�-------�---- amp, c= 0.38 .' --- ;-- - - ------- '--- - - ---� _f 0.34 ' ,' , ', 1 I ---}----------- +--------� ------------}-------�--- 0.3 1 1 1 I I 1 1 1 1 I I ---r----r---r---�----r---r __ ---r----r---r---�----r--- 0.32 ___-I----� 1--- i11 i____I__-- 0.28 ' 0.26 I____r___i____- ___ ____1___ 1 ___1____r___-____r___ 0.24 ,',� ---1___J____L___!___---__1 i1 1 11J____i__-- 1 ,' 1 1 1 1 E 016 ' 0.16 1 1 1 1 I I r 012 , -- 1 1 1 I 1 61 ' ' I 1 008 1 1 1 1 1 1 1 0.04 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 0.07 0.00 0.07 11.75 0.15 0.00 0.15 12.00 0.33 0.00 0.33 12.25 0.38 0.00 0.38 12.50 0.38 0.00 0.38 12.75 0.37 0.00 0.37 13.00 0.36 0.00 0.36 13.25 0.35 0.00 0.35 13.50 0.33 0.00 0.33 13.75 0.32 0.00 0.32 14.00 0.30 0.00 0.30 14.25 0.29 0.00 0.29 14.50 0.27 0.00 0.27 14.75 0.25 0.00 0.25 15.00 0.24 0.00 0.24 15.25 0.22 0.00 0.22 15.50 0.20 0.00 0.20 15.75 0.18 0.00 0.18 16.00 0.16 0.00 0.16 16.25 0.13 0.00 0.13 16.50 0.11 0.00 0.11 16.75 0.09 0.00 0.09 17.00 0.08 0.00 0.08 17.25 0.07 0.00 0.07 17.50 0.06 0.00 0.06 17.75 0.06 0.00 0.06 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 18.00 0.06 0.00 0.06 18.25 0.05 0.00 0.05 18.50 0.05 0.00 0.05 18.75 0.05 0.00 0.05 19.00 0.05 0.00 0.05 19.25 0.05 0.00 0.05 19.50 0.05 0.00 0.05 19.75 0.04 0.00 0.04 20.00 0.04 0.00 0.04 Printed 5/20/2021 Hark SWM-2 Prepared by Timmons Type 11 24-hr 1 Year Rainfall=3.02" Printed 5/20/2021 Summary for Link 11 L: 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 11 L: Outfall Hydrograph ---,----r---r---,-------r---,--------r---,--------r---,----r--- / I I I I I I I I I I I ■Inflow -- - L--------L---J--------L-- -'----L---'----'----`--- 0.3 I I I I o.zs crs I I I ■Primary e.�� o.2e / inflow Ar+ea�t �50 I I 0.26 / 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 -1 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____ I____r___�____I___ I I I I I I I I I 0.00 / I I I I I I I I I 0'� -I r -1 -I -I -1 -I -T - -I 7 8 9 10 11 12 13 Time (hours) Hark SWM-2 Prepared by Timmons Type/1 24-hr 1 Year Rainfall=3.02" Hydrograph for Link 11 L: Outfall 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 5/20/2021 Hark SWM-2 Prepared by Timmons G Type 11 24-hr 2 Year Rainfall=3.65" Printed 5/20/2021 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>1.61" Tc=6.0 min CN=80 Runoff=4.09 cfs 0.182 of Subcatchment 8S: Post -Developed Areal Runoff Area=1.350 ac 44.44% Impervious Runoff Depth>1.61" Tc=6.0 min CN=80 Runoff=4.09 cfs 0.182 of Subcatchment 10S: Pre -Developed Area 1 Runoff Area=1.350 ac 0.00% Impervious Runoff Depth>0.74" Flow Length=475' Tc=8.9 min CN=65 Runoff=1.63 cfs 0.083 of Subcatchment 12S: Pre -Developed Area 2 to Runoff Area=3.530 ac 1.42% Impervious Runoff Depth>0.74" Flow Length=475' Tc=8.9 min CN=65 Runoff=4.25 cfs 0.217 of Subcatchment 14S: Post -Developed Area 2 Runoff Area=3.560 ac 3.65% Impervious Runoff Depth>0.78" Flow Length=475' Tc=8.9 min CN=66 Runoff=4.62 cfs 0.233 of Pond 8P: Storage Pipes Modified Design 3" Peak EIev=640.76' Storage=0.067 of Inflow=4.09 cfs 0.182 of Outflow=1.57 cfs 0.180 of Pond 913: Storage Pipes Original Design 2.5" Peak EIev=640.98' Storage=0.072 of Inflow=4.09 cfs 0.182 of Outflow=1.36 cfs 0.178 of Link 5L: Outfall Link 11 L: Outfall Inflow=1.57 cfs 0.180 of Primary=1.57 cfs 0.180 of Inflow=1.36 cfs 0.178 of Primary=1.36 cfs 0.178 of Total Runoff Area = 11.140 ac Runoff Volume = 0.895 of Average Runoff Depth = 0.96" 87.61 % Pervious = 9.760 ac 12.39% Impervious =1.380 ac Hark SWM-2 Prepared by Timmons Type/1 24-hr 2 Year Rainfall=3.65" Printed 5/20/2021 Summary for Subcatchment 2S: Post -Developed Area 1 Routed Runoff = 4.09 cfs @ 11.97 hrs, Volume= 0.182 af, Depth> 1.61" 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 2 Year Rainfall=3.65' 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 I I I I I I I I I C 4 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 3 II 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 3 --- ----i ---;---- i----i---- - LL 2 I I I I I I I I I I I 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'll I I I I I ■ Runoff Type 11 24yhr 2 YearRainfall�3.65" --I Are61=1.350'ac- Runoff i Vol'lume=0.'1182'II of Runoff DepthA.61" Tic=6,G trim CN=180 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Hark SWM-2 Prepared by Timmons Type/1 24-hr 2 Year Rainfall=3.65" Printed 5/20/2021 Hydrograph for Subcatchment 2S: Post -Developed Area 1 Routed Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.23 0.00 0.00 5.25 0.24 0.00 0.00 5.50 0.26 0.00 0.00 5.75 0.28 0.00 0.00 6.00 0.29 0.00 0.00 6.25 0.31 0.00 0.00 6.50 0.33 0.00 0.00 6.75 0.34 0.00 0.00 7.00 0.36 0.00 0.00 7.25 0.38 0.00 0.00 7.50 0.40 0.00 0.00 7.75 0.42 0.00 0.00 8.00 0.44 0.00 0.00 8.25 0.46 0.00 0.00 8.50 0.48 0.00 0.00 8.75 0.51 0.00 0.00 9.00 0.54 0.00 0.00 9.25 0.57 0.00 0.01 9.50 0.59 0.00 0.01 9.75 0.63 0.01 0.01 10.00 0.66 0.01 0.02 10.25 0.70 0.01 0.03 10.50 0.74 0.02 0.04 10.75 0.80 0.03 0.05 11.00 0.86 0.04 0.08 11.25 0.93 0.06 0.11 11.50 1.03 0.09 0.17 11.75 1.41 0.24 0.98 12.00 2.42 0.83 3.93 12.25 2.58 0.94 0.58 12.50 2.68 1.02 0.38 12.75 2.76 1.07 0.28 13.00 2.82 1.12 0.24 13.25 2.87 1.15 0.21 13.50 2.92 1.19 0.18 13.75 2.96 1.22 0.16 14.00 2.99 1.24 0.14 14.25 3.03 1.27 0.13 14.50 3.06 1.29 0.13 14.75 3.09 1.32 0.12 15.00 3.12 1.34 0.12 15.25 3.14 1.36 0.11 15.50 3.17 1.38 0.10 15.75 3.19 1.39 0.10 16.00 3.21 1.41 0.09 16.25 3.23 1.43 0.09 16.50 3.25 1.44 0.08 16.75 3.27 1.46 0.08 17.00 3.29 1.47 0.08 17.25 3.31 1.49 0.08 17.50 3.33 1.50 0.08 17.75 3.34 1.51 0.07 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 3.36 1.53 0.07 18.25 3.38 1.54 0.07 18.50 3.39 1.55 0.07 18.75 3.41 1.56 0.06 19.00 3.42 1.58 0.06 19.25 3.44 1.59 0.06 19.50 3.45 1.60 0.06 19.75 3.46 1.61 0.05 20.00 3.47 1.62 0.05 Hark SWM-2 Prepared by Timmons Type/1 24-hr 2 Year Rainfall=3.65" Printed 5/20/2021 Summary for Subcatchment 8S: Post -Developed Area 1 Routed Runoff = 4.09 cfs @ 11.97 hrs, Volume= 0.182 af, Depth> 1.61" 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 2 Year Rainfall=3.65' 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 8S: Post -Developed Area 1 Routed I I I I I I I I I C 4 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 3 II 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 3 --- ----i ---;---- i----i---- - LL 2 I I I I I I I I I I I 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'll I I I I I ■ Runoff Type 11 24yhr 2 YearRainfall�3.65" --I Are61=1.350'ac- Runoff i Vol'lume=0.'1182'II of Runoff DepthA.61" Tic=6,G trim CN=180 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Hark SWM-2 Prepared by Timmons Type/1 24-hr 2 Year Rainfall=3.65" Printed 5/20/2021 Hydrograph for Subcatchment 8S: Post -Developed Area 1 Routed Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.23 0.00 0.00 5.25 0.24 0.00 0.00 5.50 0.26 0.00 0.00 5.75 0.28 0.00 0.00 6.00 0.29 0.00 0.00 6.25 0.31 0.00 0.00 6.50 0.33 0.00 0.00 6.75 0.34 0.00 0.00 7.00 0.36 0.00 0.00 7.25 0.38 0.00 0.00 7.50 0.40 0.00 0.00 7.75 0.42 0.00 0.00 8.00 0.44 0.00 0.00 8.25 0.46 0.00 0.00 8.50 0.48 0.00 0.00 8.75 0.51 0.00 0.00 9.00 0.54 0.00 0.00 9.25 0.57 0.00 0.01 9.50 0.59 0.00 0.01 9.75 0.63 0.01 0.01 10.00 0.66 0.01 0.02 10.25 0.70 0.01 0.03 10.50 0.74 0.02 0.04 10.75 0.80 0.03 0.05 11.00 0.86 0.04 0.08 11.25 0.93 0.06 0.11 11.50 1.03 0.09 0.17 11.75 1.41 0.24 0.98 12.00 2.42 0.83 3.93 12.25 2.58 0.94 0.58 12.50 2.68 1.02 0.38 12.75 2.76 1.07 0.28 13.00 2.82 1.12 0.24 13.25 2.87 1.15 0.21 13.50 2.92 1.19 0.18 13.75 2.96 1.22 0.16 14.00 2.99 1.24 0.14 14.25 3.03 1.27 0.13 14.50 3.06 1.29 0.13 14.75 3.09 1.32 0.12 15.00 3.12 1.34 0.12 15.25 3.14 1.36 0.11 15.50 3.17 1.38 0.10 15.75 3.19 1.39 0.10 16.00 3.21 1.41 0.09 16.25 3.23 1.43 0.09 16.50 3.25 1.44 0.08 16.75 3.27 1.46 0.08 17.00 3.29 1.47 0.08 17.25 3.31 1.49 0.08 17.50 3.33 1.50 0.08 17.75 3.34 1.51 0.07 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 3.36 1.53 0.07 18.25 3.38 1.54 0.07 18.50 3.39 1.55 0.07 18.75 3.41 1.56 0.06 19.00 3.42 1.58 0.06 19.25 3.44 1.59 0.06 19.50 3.45 1.60 0.06 19.75 3.46 1.61 0.05 20.00 3.47 1.62 0.05 Hark SWM-2 Prepared by Timmons G Type 11 24-hr 2 Year Rainfall=3.65" Printed 5/20/2021 Summary for Subcatchment 10S: Pre -Developed Area 1 Runoff = 1.63 cfs @ 12.02 hrs, Volume= 0.083 af, Depth> 0.74" 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 2 Year Rainfall=3.65" 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 LL 8.9 475 Total Subcatchment 10S: Pre -Developed Area 1 Hydrograph i t.at cls Type II 24-hr 2 Year Rainfall=3.65" Runoff Area=1.350 ac Runoff Volume=0.083 of Runoff Depth>0.74" Flow Length=475' Tc=8.9 min CN=65 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 2 Year Rainfall=3.65" Hydrograph for Subcatchment 10S: Pre -Developed Area 1 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.23 0.00 0.00 5.25 0.24 0.00 0.00 5.50 0.26 0.00 0.00 5.75 0.28 0.00 0.00 6.00 0.29 0.00 0.00 6.25 0.31 0.00 0.00 6.50 0.33 0.00 0.00 6.75 0.34 0.00 0.00 7.00 0.36 0.00 0.00 7.25 0.38 0.00 0.00 7.50 0.40 0.00 0.00 7.75 0.42 0.00 0.00 8.00 0.44 0.00 0.00 8.25 0.46 0.00 0.00 8.50 0.48 0.00 0.00 8.75 0.51 0.00 0.00 9.00 0.54 0.00 0.00 9.25 0.57 0.00 0.00 9.50 0.59 0.00 0.00 9.75 0.63 0.00 0.00 10.00 0.66 0.00 0.00 10.25 0.70 0.00 0.00 10.50 0.74 0.00 0.00 10.75 0.80 0.00 0.00 11.00 0.86 0.00 0.00 11.25 0.93 0.00 0.00 11.50 1.03 0.00 0.00 11.75 1.41 0.02 0.08 12.00 2.42 0.27 1.59 12.25 2.58 0.33 0.39 12.50 2.68 0.37 0.23 12.75 2.76 0.40 0.17 13.00 2.82 0.43 0.14 13.25 2.87 0.45 0.12 13.50 2.92 0.47 0.11 13.75 2.96 0.49 0.10 14.00 2.99 0.50 0.09 14.25 3.03 0.52 0.08 14.50 3.06 0.53 0.08 14.75 3.09 0.55 0.08 15.00 3.12 0.56 0.07 15.25 3.14 0.57 0.07 15.50 3.17 0.58 0.07 15.75 3.19 0.60 0.06 16.00 3.21 0.61 0.06 16.25 3.23 0.62 0.06 16.50 3.25 0.63 0.05 16.75 3.27 0.64 0.05 17.00 3.29 0.65 0.05 17.25 3.31 0.65 0.05 17.50 3.33 0.66 0.05 17.75 3.34 0.67 0.05 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 3.36 0.68 0.05 18.25 3.38 0.69 0.04 18.50 3.39 0.70 0.04 18.75 3.41 0.70 0.04 19.00 3.42 0.71 0.04 19.25 3.44 0.72 0.04 19.50 3.45 0.73 0.04 19.75 3.46 0.73 0.04 20.00 3.47 0.74 0.03 Printed 5/20/2021 Hark SWM-2 Prepared by Timmons Type/1 24-hr 2 Year Rainfall=3.65" Printed 5/20/2021 Summary for Subcatchment 12S: Pre -Developed Area 2 to Sheet Flow Runoff = 4.25 cfs @ 12.02 hrs, Volume= 0.217 af, Depth> 0.74" 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 2 Year Rainfall=3.65' 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 m] 475 Total Subcatchment 12S: Pre -Developed Area 2 to Sheet Flow Hydrogreph 10 11 12 13 Time (hours) ' ' ' ' 'i 'i 'i ■Runoff Type 11 24rh r 2 Year kainfall.3.65" Runoff Areal=3.530 ac Runoff', Vol',ume=0:¢1 T of Runoff DepthAJ4" --- Flotw-Lengt -_4753 Tc=8,9 rain dN-65 -------------- Hark SWM-2 Prepared by Timmons Type/1 24-hr 2 Year Rainfall=3.65" Printed 5/20/2021 Hydrograph for Subcatchment 12S: Pre -Developed Area 2 to Sheet Flow Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.23 0.00 0.00 5.25 0.24 0.00 0.00 5.50 0.26 0.00 0.00 5.75 0.28 0.00 0.00 6.00 0.29 0.00 0.00 6.25 0.31 0.00 0.00 6.50 0.33 0.00 0.00 6.75 0.34 0.00 0.00 7.00 0.36 0.00 0.00 7.25 0.38 0.00 0.00 7.50 0.40 0.00 0.00 7.75 0.42 0.00 0.00 8.00 0.44 0.00 0.00 8.25 0.46 0.00 0.00 8.50 0.48 0.00 0.00 8.75 0.51 0.00 0.00 9.00 0.54 0.00 0.00 9.25 0.57 0.00 0.00 9.50 0.59 0.00 0.00 9.75 0.63 0.00 0.00 10.00 0.66 0.00 0.00 10.25 0.70 0.00 0.00 10.50 0.74 0.00 0.00 10.75 0.80 0.00 0.00 11.00 0.86 0.00 0.00 11.25 0.93 0.00 0.00 11.50 1.03 0.00 0.00 11.75 1.41 0.02 0.20 12.00 2.42 0.27 4.16 12.25 2.58 0.33 1.01 12.50 2.68 0.37 0.61 12.75 2.76 0.40 0.44 13.00 2.82 0.43 0.37 13.25 2.87 0.45 0.33 13.50 2.92 0.47 0.29 13.75 2.96 0.49 0.26 14.00 2.99 0.50 0.23 14.25 3.03 0.52 0.22 14.50 3.06 0.53 0.21 14.75 3.09 0.55 0.20 15.00 3.12 0.56 0.19 15.25 3.14 0.57 0.18 15.50 3.17 0.58 0.17 15.75 3.19 0.60 0.16 16.00 3.21 0.61 0.15 16.25 3.23 0.62 0.14 16.50 3.25 0.63 0.14 16.75 3.27 0.64 0.14 17.00 3.29 0.65 0.13 17.25 3.31 0.65 0.13 17.50 3.33 0.66 0.13 17.75 3.34 0.67 0.12 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 3.36 0.68 0.12 18.25 3.38 0.69 0.12 18.50 3.39 0.70 0.11 18.75 3.41 0.70 0.11 19.00 3.42 0.71 0.11 19.25 3.44 0.72 0.10 19.50 3.45 0.73 0.10 19.75 3.46 0.73 0.09 20.00 3.47 0.74 0.09 Hark SWM-2 Prepared by Timmons G Type 11 24-hr 2 Year Rainfall=3.65" Printed 5/20/2021 Summary for Subcatchment 14S: Post -Developed Area 2 to Sheet Flow Runoff = 4.62 cfs @ 12.02 hrs, Volume= 0.233 af, Depth> 0.78" 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 2 Year Rainfall=3.65" 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 8.9 475 Total Subcatchment 14S: Post -Developed Area 2 to Sheet Flow Hydrograph ❑ Runotf Type II 24-hr 2 Year Rainfall=3.65" Runoff Area=3.560 ac Runoff Volume=0.233 of Runoff Depth>0.78" Flow Length=475' Tc=8.9 min 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 2 Year Rainfall=3.65" Printed 5/20/2021 Hydrograph for Subcatchment 14S: Post -Developed Area 2 to Sheet Flow Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.23 0.00 0.00 5.25 0.24 0.00 0.00 5.50 0.26 0.00 0.00 5.75 0.28 0.00 0.00 6.00 0.29 0.00 0.00 6.25 0.31 0.00 0.00 6.50 0.33 0.00 0.00 6.75 0.34 0.00 0.00 7.00 0.36 0.00 0.00 7.25 0.38 0.00 0.00 7.50 0.40 0.00 0.00 7.75 0.42 0.00 0.00 8.00 0.44 0.00 0.00 8.25 0.46 0.00 0.00 8.50 0.48 0.00 0.00 8.75 0.51 0.00 0.00 9.00 0.54 0.00 0.00 9.25 0.57 0.00 0.00 9.50 0.59 0.00 0.00 9.75 0.63 0.00 0.00 10.00 0.66 0.00 0.00 10.25 0.70 0.00 0.00 10.50 0.74 0.00 0.00 10.75 0.80 0.00 0.00 11.00 0.86 0.00 0.00 11.25 0.93 0.00 0.00 11.50 1.03 0.00 0.00 11.75 1.41 0.03 0.29 12.00 2.42 0.30 4.54 12.25 2.58 0.36 1.08 12.50 2.68 0.40 0.65 12.75 2.76 0.43 0.46 13.00 2.82 0.46 0.40 13.25 2.87 0.48 0.34 13.50 2.92 0.51 0.31 13.75 2.96 0.52 0.27 14.00 2.99 0.54 0.25 14.25 3.03 0.56 0.23 14.50 3.06 0.57 0.22 14.75 3.09 0.59 0.21 15.00 3.12 0.60 0.20 15.25 3.14 0.61 0.19 15.50 3.17 0.63 0.18 15.75 3.19 0.64 0.17 16.00 3.21 0.65 0.16 16.25 3.23 0.66 0.15 16.50 3.25 0.67 0.15 16.75 3.27 0.68 0.14 17.00 3.29 0.69 0.14 17.25 3.31 0.70 0.14 17.50 3.33 0.71 0.13 17.75 3.34 0.72 0.13 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 3.36 0.73 0.13 18.25 3.38 0.73 0.12 18.50 3.39 0.74 0.12 18.75 3.41 0.75 0.11 19.00 3.42 0.76 0.11 19.25 3.44 0.77 0.11 19.50 3.45 0.77 0.10 19.75 3.46 0.78 0.10 20.00 3.47 0.79 0.09 Hark SWM-2 Prepared by Timmons G Type 11 24-hr 2 Year Rainfall=3.65" Printed 5/20/2021 Summary for Pond 8P: Storage Pipes Modified Design 3" Minimum Orifice Inflow Area = 1.350 ac, 44.44% Impervious, Inflow Depth > 1.61" for 2 Year event Inflow = 4.09 cfs @ 11.97 hrs, Volume= 0.182 of Outflow = 1.57 cfs @ 12.10 hrs, Volume= 0.180 af, Atten= 62%, Lag= 7.6 min Primary = 1.57 cfs @ 12.10 hrs, Volume= 0.180 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs / 2 Peak Elev= 640.76' @ 12.10 hrs Surf.Area= 0.025 ac Storage= 0.067 of Plug -Flow detention time= 57.4 min calculated for 0.180 of (99% of inflow) Center -of -Mass det. time= 54.7 min ( 844.6 - 790.0) 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' 3.0" Vert. Orifice/Grate C= 0.600 #2 Primary 640.25' 12.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 #3 Primary 642.75' 4.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=1.57 cfs @ 12.10 hrs HW=640.76' (Free Discharge) �1=Orifice/Grate (Orifice Controls 0.42 cfs @ 8.52 fps) 2=Orifice/Grate (Orifice Controls 1.15 cfs @ 2.31 fps) 3=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) N u Pond 8P: Storage Pipes Modified Design 3" Minimum Orifice Hydrograph Time (hours) ❑ Inflow -11 ❑ Primary Hark SWM-2 Prepared by Timmons 641 c m 640 w 639 638 I a 0 m d W Type/1 24-hr 2 Year Rainfall=3.65" Printed 5/20/2021 Pond 8P: Storage Pipes Modified Design 3" Minimum Orifice Stage -Discharge it 1---- !--- - _J_ Orifice Orifice/Grate , Discharge (cfs) )ctangular Weir i _L____ 1____!____J____ Pond 8P: Storage Pipes Modified Design 3" Minimum Orifice Stage -Area -Storage i --jPipe Storage . . 1050.010.0150.020.0250.030.0350.040.0450.050.0550.060.0650.070.0750.080.0850.090.095 0.1 0.1050.110.1150.1 £ Storage (acre-feet) ■ Primary ■ Storage Hark SWM-2 Prepared by Timmons Type/1 24-hr 2 Year Rainfall=3.65" Printed 5/20/2021 Hydrograph for Pond 8P: Storage Pipes Modified Design 3" Minimum Orifice 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 0.000 637.51 0.00 9.50 0.01 0.000 637.55 0.01 10.00 0.02 0.000 637.58 0.02 10.50 0.04 0.001 637.63 0.03 11.00 0.08 0.001 637.69 0.06 11.50 0.17 0.003 637.83 0.11 12.00 3.93 0.055 640.32 0.44 12.50 0.38 0.057 640.37 0.53 13.00 0.24 0.052 640.17 0.38 13.50 0.18 0.045 639.90 0.36 14.00 0.14 0.037 639.60 0.33 14.50 0.13 0.030 639.28 0.30 15.00 0.12 0.023 638.97 0.27 15.50 0.10 0.017 638.68 0.24 16.00 0.09 0.011 638.41 0.21 16.50 0.08 0.007 638.16 0.17 17.00 0.08 0.004 637.95 0.14 17.50 0.08 0.002 637.82 0.10 18.00 0.07 0.002 637.75 0.08 18.50 0.07 0.001 637.72 0.07 19.00 0.06 0.001 637.70 0.06 19.50 0.06 0.001 637.69 0.06 20.00 0.05 0.001 637.68 0.05 Hark SWM-2 Prepared by Timmons Type/1 24-hr 2 Year Rainfall=3.65" Printed 5/20/2021 Stage -Discharge for Pond 8P: Storage Pipes Modified Design 3" Minimum Orifice Elevation Primary (feet) (cfs) 637.50 0.00 637.54 0.00 637.58 0.01 637.62 0.03 637.66 0.05 637.70 0.06 637.74 0.08 637.78 0.09 637.82 0.10 637.86 0.11 637.90 0.12 637.94 0.13 637.98 0.14 638.02 0.15 638.06 0.16 638.10 0.16 638.14 0.17 638.18 0.18 638.22 0.18 638.26 0.19 638.30 0.19 638.34 0.20 638.38 0.21 638.42 0.21 638.46 0.22 638.50 0.22 638.54 0.23 638.58 0.23 638.62 0.24 638.66 0.24 638.70 0.25 638.74 0.25 638.78 0.25 638.82 0.26 638.86 0.26 638.90 0.27 638.94 0.27 638.98 0.28 639.02 0.28 639.06 0.28 639.10 0.29 639.14 0.29 639.18 0.29 639.22 0.30 639.26 0.30 639.30 0.31 639.34 0.31 639.38 0.31 639.42 0.32 639.46 0.32 639.50 0.32 639.54 0.33 Elevation Primary (feet) (cfs) 639.58 0.33 639.62 0.33 639.66 0.34 639.70 0.34 639.74 0.34 639.78 0.35 639.82 0.35 639.86 0.35 639.90 0.36 639.94 0.36 639.98 0.36 640.02 0.37 640.06 0.37 640.10 0.37 640.14 0.37 640.18 0.38 640.22 0.38 640.26 0.39 640.30 0.42 640.34 0.48 640.38 0.54 640.42 0.62 640.46 0.71 640.50 0.80 640.54 0.90 640.58 1.01 640.62 1.13 640.66 1.25 640.70 1.38 640.74 1.52 640.78 1.64 640.82 1.74 640.86 1.84 640.90 1.92 640.94 2.00 640.98 2.08 641.02 2.15 641.06 2.22 641.10 2.29 641.14 2.36 641.18 2.42 641.22 2.48 641.26 2.54 641.30 2.60 641.34 2.65 641.38 2.71 641.42 2.76 641.46 2.81 641.50 2.87 641.54 2.92 641.58 2.97 641.62 3.01 Elevation Primary (feet) (cfs) 641.66 3.06 641.70 3.11 641.74 3.16 641.78 3.20 641.82 3.25 641.86 3.29 641.90 3.33 641.94 3.38 641.98 3.42 642.02 3.46 642.06 3.50 642.10 3.54 642.14 3.58 642.18 3.62 642.22 3.66 642.26 3.70 642.30 3.74 642.34 3.78 642.38 3.81 642.42 3.85 642.46 3.89 642.50 3.92 642.54 3.96 642.58 4.00 642.62 4.03 642.66 4.07 642.70 4.10 642.74 4.14 642.78 4.24 642.82 4.45 642.86 4.71 642.90 5.02 642.94 5.38 642.98 5.76 643.02 6.18 643.06 6.62 643.10 7.09 643.14 7.59 643.18 8.11 643.22 8.64 643.26 9.20 643.30 9.78 643.34 10.37 643.38 10.99 643.42 11.61 643.46 12.26 643.50 12.92 Hark SWM-2 Prepared by Timmons Type/1 24-hr 2 Year Rainfall=3.65" Printed 5/20/2021 Stage -Area -Storage for Pond 8P: Storage Pipes Modified Design 3" Minimum Orifice 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 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