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Home My WebLink AboutWPO202000051 Calculations 2021-02-05BOYS AND GIRLS CLUB - DRIVER'S EDUCATION SITE COUNTY OF ALBEMARLE, VIRGINIA DESIGN CALCULATIONS & NARRATIVE REF. WP0202000051 NOVEMBER 4, 2020 REV. FEBRUARY 5, 2021 • TIMMONS GROUP YOUR VISION ACHIEVED THROUGH OURS. Prepared by: Craig Kotarski, PE Timmons Group 608 Preston Ave, Suite 200 Charlottesville, VA 22903 434.327.1688 Uc. No. 0402048507 Table of Contents Section Title Project Narrative 2 LD 229 — Storm Sewer Design Computations LD 204 — Storm Inlet Design Computations (I = 4 in. & I = 6 in.) 4 LD 347 — Hydraulic Grade Line Computations Virginia Runoff Reduction Method Worksheet Summary 6 Pre -Developed HyrdoCAD Calculations 7 Post -Developed HydroCAD Calculations 8 Riprap Calculations Proiect Narrative: This project includes demolition of the existing driver's education course and the construction of a Boys and Girls Club community center, surface parking lot, and associated landscaping, utilities, and drainage facilities. The limits of disturbance due to clearing and grading totals 5.10 acres. Stormwater Management: Water Quality In the pre -developed condition, the site is an existing driver's education course with 1.97 acres of impervious cover, 2.28 acres of managed turf, and 0.85 acres of forest. In the proposed condition, there will be 2.23 acres of impervious cover and 2.87 acres of managed turf. Per the Virginia Runoff Reduction Spreadsheet, this development will require that 1.61 lbs. of phosphorus be removed per year. Nutrient credits will be purchased to meet stormwater quality requirements. Water Quantity In existing condition, the entire site ultimately drains towards a stream south of the site. The western portion of the site is first conveyed through a series of pipes to an existing manufactured wetland facility, before it is discharged into the stream. The eastern portion of the site is conveyed through a series of pipes to a concrete channel, before it is discharged into the stream. In the proposed condition, the existing drainage patterns will be maintained to the nearest extent practical. Two underground detention systems will be installed to meet stormwater quantity requirements. SWMI is 65 linear feet of 48" CMP while SWM2 is 180 linear feet of 96" CMP. STMI is located on the western portion of the site and outfalls into an existing pipe, which will convey this flow into the existing manufactured wetland facility and ultimately to the southern stream. STM2 is located on the eastern portion of the site and outfalls into a series of proposed pipes that eventually outfall into the southern stream. Together, these pipes reduce the 1-year, 24-hour storm to meet the requirements of the energy balance equation. Additionally, the 10-year, 24-hour storm is being detained to less than the pre -developed 10-year, 24-hour storm to meet flood protection requirements. Due to the dual detention system design, this site maintains existing drainage patterns while also meeting energy balance at its final outfall location. STORM SEWER DESIGN COMPUTATIONS STORM FREQUENCY 10 PROJECT: Boys and Girls Club LOCATION: COUNTY: Albemade Designed by: Checked by: UNITS ENGLISX PIPE NO FROM P(oJ TOPOWT DRAW, AREA RUNOFF COEFF. C. (4) CA TOTAL WLEF TIME Minces (]) RAW FALL INHr (8) RUNOFF Q US (9) INVERT ELEVATIONS LENGTH of Pipe FL (12) SLOPE FUFI (13) SIZE (Dia. Or Spa A'.) In. (Id) SHAPE Capaziry US (15) Friction SIope FUFI VEL V. FPS. (16) FLOW TIME M. (17) REMARK S (18) INCRE- MENT (5) ADDTL CA ACCUM- ULATED (6) UPPER END (10) LOWER END (11) REFERENCE (I) STA. REFERENCE (2) STA_ "A' Acre (3) 111 112 Ho 0.000 (FOW 0000 1.764 1764 6000 6230 10990 549000 54]580 23668 0060 24000 Circular WON 0002 14.578 0027 Oflall eom STRMA 109 Ho 108 0.000 0000 0No 0000 1764 6027 6222 109/6 543810 562000 M208 0050 24000 Cicular 547% 0002 13652 0N4 10 108 106 0000 0000 0000 0m 1764 601 6209 10953 534931 533709 24.428 0050 24000 Circular 547% 0002 13643 0030 125C 126 125B (FE0 (F410 0019 0No 0049 6No 6230 0.307 534635 534440 390/3 0005 15000 Circular 4947 0000 22" 0290 125A 125B 106 0050 039) 0020 0No 0069 6290 6.146 0422 534338 534.190 29 W6 0005 15000 Circular 4947 0.000 206 02N 105C 1% 105B (030 (3]0 0011 0No 1.844 6W0 6230 114887 5327% 531500 25791 0050 24000 Circular 547% 0002 138281 0031 127 128 105B 0010 (400 0004 0No 0004 0m 8901 0036 532515 532220 9.823 0030 12000 Circular 6.693 0.000 2261 0072 105A 10511 IN 0No 0No 0No 0No L848 6031 6221 11495 530010 529250 37989 0020 24000 Circular 34655 0002 9930 0064 117 118 116 0090 0350 0032 0m 0032 6W0 6230 0.1% 542%2 5W.806 50.263 0062 15000 Circular 144n 0000 4151 0202 115 116 114 0080 0420 0034 0m 0065 6202 6.171 002 541023 534240 108380 0063 15000 Circular 17.503 0000 5900 0306 113 114 IN 0270 030 007 0M 0.162 6.508 6084 0.988 534J 39 530.854 93.851 0035 15000 Circular 13099 0000 6292 0249 121 in 120 0130 0350 0016 0M 0046 6W0 6230 0283 533]01 53L113 SO.955 0050 15000 Circular 15644 0000 4910 0173 119 120 IN 0110 0750 0083 0M 0.128 6.173 6.180 0W1 531.050 52930 171023 0010 15000 Clmular 6.9% 0000 3786 0753 103 IN 102 0120 070 0089 0M 2227 6.W6 5970 132% 527.041 SZ0.370 76311 0087 30.000 Circular 131.373 0001 1720 0074 101 102 100 0000 0000 0m 0m 2227 7No 5951 13252 516032 512670 9900 0034 30.000 Circular 81361 0001 122M 0134 214E 214C 214A 0020 0No 0018 0m 0018 0No 11901 0.160 556751 556050 140.129 0005 12000 Circular 2729 0000 1903 1227 213 214A 212 0270 0610 0.165 0.304 0487 1n7 8.151 3.%7 555%9 555320 125.922 0005 15000 Circular 4947 0003 4491 0.0] ROofdminarea BLDG2 209 212 208 01% 06W 0.125 0No 0612 1695 7902 4.837 555220 553 M1 ]3.826 0020 15000 Circular 9.968 0005 8080 0152 20 208 206 02% 0330 0212 0No 0.824 1.847 7.825 6446 552 W9 551.842 193293 0005 21000 Circular 12.136 0001 5133 0US 205 206 304 0320 (F970 020 0000 1070 2474 7524 8052 551742 551403 67786 0005 24000 Circular 17.327 0001 5426 0208 215C 216 215B 000 OAW 0020 0No 0020 0No 11901 0.174 556 M2 555335 102 WO 0010 12000 Circular 3.859 0000 24% 0687 215A 215B 204 0010 0.900 0No 0No 0029 0687 8462 0242 554070 553.838 11613 0020 12000 Circular 5457 0000 3.501 0055 203 304 202 0000 0000 0000 0.352 1450 2683 7430 10 W6 551 ME 550336 193 SM 0005 24000 Circular 17.327 0002 5.826 0554 OEn. wmer from EX3 217 218 202 0000 0SW 0No ITs) 1250 0m 11901 1L126 554020 553415 120.912 0005 24000 Circular 17.327 0002 5.MS 0363 OBsnre wacer from EX1 201 202 200 0460 07330 0.321 0M6 3668 3236 7.193 26380 55020 550041 9M7 0020 30.000 Circular 63.SM 0004 12.373 0013 ORsire wacer from EX2 301 I I 300 I 1 0.000 1 0.000 1 0000 1 0.323 1 0323 1 6000 6230 1 2012 1 546-000 1 541.881 1 41.192 1 0IW 1 15M Circular22.12A 1 0001 11236 0061 1OuM'a1l From STRMB 403 404 02 0.180 0.800 0.1" 0000 0.1" 6000 6230 0.897 553" 550956 304.435 1 0010 1 ISM Circular 6.9% 1 0.000 13927 1 0868 un 02 400 0.300 070 0n2 0No 0366 6.868 5986 2.191 550" 547990 73665 1 0030 1 ISM 10mularl 121181 0.001 7.508 0164 503 504 502 0.560 0360 0202 0000 0202 6000 4056 0.818 547_121 50.170 190.189 OW5 ISM Circular 4.947 1 0000 i 2987 i 1061 Son 502 500 0380 0370 0.141 0WO 0342 7061 3.853 1.319 546-069 50.000 13.805 0005 15000 I Circular 1 4.94] 1 0000 13 418 10 067 FORM L0201 STORMWATER INLET COMPUTATIONS SHEET 1 OF ROUTE PROJECT Boys B GHa Club Dd�s Ed DESIGNER: JLF DATE W/ 021 CHECKED: UNITSAGUSH mmm�mmmmomommmmmmmmmmmmmmmmmmmmm��m mmm�mmm0000mmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmm®mmmmmmmm®mm®mmmm�mtm� mmm�m®mmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmomommmmmmmmmmmmmmmmmmmmm��m mmm�mmm0000mmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmm®mmmmmmmm®mmmmmmm�mtm� ®mm�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmomommmmmmmmmmmmmmmmmmmmm��m mmm�mmm0000mmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmm®mmmmmmmm®mmmmmmm�mm� mmm�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmomommmmmmmmmmmmmmmmmmmmm��m mmm�mmm0000mmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmm�mmm®mmmmmmmm®mmmmmmm�mtm� mmm�m®mmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmomommmmmmmmmmmmmmmmmmmmm��m mmm�mmm0000mmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmm®mmmmmmmm®mmmmmmm�mtm� mmm�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmomommmmmmmmmmmmmmmmmmmmm��m mmm�mmm0000mmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmm®mmmmmmmmmmmm®mmmmmmm�mtm� ®mm�m®mmmmmmmmmmmmmmmmmmmmmmmmmm��m� mmm�mmmmomommmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmomommmmmmmmmmmmmmmmmmmmm��m mmm�mmm0000mmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmm®mmmmmmmm®mmmmmmm�mtm� mmm�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmomommmmmmmmmmmmmmmmmmmmm��m mmm�mmm0000mmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmm�mmm®mmmmmmmm®mmmmmmm�mtm� mmm�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmomommmmmmmmmmmmmmmmmmmmm��m mmm�mmm0000mmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmm®mmmmmmmmommmmmmm�®mom m�m�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m INLETSOFT RY ENSOFTEC DATE: W/ l FORM L0201 STORMWATER INLET COMPUTATIONS SHEET 2 OF ROU PROJECT Boys B GHa Club Dd�s Ed DESIGNER: JLF DATE W/ 021 CHECKED: UNITSAGUSH INLETSOFT RY ENSOFTEC DATE: W/ l FORM L0201 STORMWATER INLET COMPUTATIONS SHEET 3 OF ROU PROJECT Boys B GHa Club Dd�s Ed DESIGNER: JLF DATE W/ 021 CHECKED: UNITSAGUSH INLETSOFT RY ENSOFTEC DATE: W/ l FORM L0201 STORMWATER INLET COMPUTATIONS SHEET 1 OF ROUTE PROJECT Boys B GHa Club Dd�s Ed DESIGNER: JLF DATE W/ 021 CHECKED: UNITSAGUSH INLETSOFT RY ENSOFTEC DATE: W/ l FORM L0201 STORMWATER INLET COMPUTATIONS SHEET 2 OF ROU PROJECT Boys B GHa Club Dd�s Ed DESIGNER: JLF DATE W/ 021 CHECKED: UNITSAGUSH INLETSOFT RY ENSOFTEC DATE: W/ l FORM L0201 STORMWATER INLET COMPUTATIONS SHEET 3 OF ROU PROJECT Boys B GHa Club Dd�s Ed DESIGNER: JLF DATE W/ 021 CHECKED: UNITSAGUSH INLETSOFT RY ENSOFTEC DATE: W/ l PROJECT: Boys and! Girls Club DESIGNED BY: HYDRAULIC GRADE LINE ANALYSIS Checked: INCIDENCE PROBABILITY 10 Year INLET OR JUNCTION INLET STATION OUTLET WATER SURFACE EIEV. DIA PIPE Do (In) DESIGN DISCH. Go (CFS) LENGTH PIPE LO (Ft) FRICTION SLOPE, St (FT/M FRICTION LOSS Hf (Ft) JUNCTION LOSS FINAL H (Fb Ioet Waled Sutl Elevatlm RM Ek Coom V. No (Ft) OI N OM N4r4 HI Angle HA HI IS M OE M 102 516.88 30 13.25 99.04 0.0009 0.09 12.28 0.59 13.30 11.21 228.]] 4.60 1.61 0.00 0.00 2.19 0 TRUE 1.19 518.07 526.42 OK -8.36 1D4 522.37 30 13.30 76.31 0.0009 0.07 11.21 1.15 11.50 9.93 114.14 1.53 0.54 0.00 D.00 1.69 0 TRUE 0.91 523.28 536.80 OK -13.52 105B 530.85 24 11.50 37.99 0.0022 0.08 9.93 0.38 11.49 13.83 158.85 2.97 1.04 0.00 0.00 1.42 0 TRUE 0.79 531.64 536.98 OK -5.33 106 533.10 24 11.49 25.79 0.0022 0.06 13.83 0.74 10.95 13.64 149.44 2.89 1.01 0.00 0.00 1.75 0 TRUE 0.93 534.03 538.90 OK 4.87 108 535.31 24 10.95 24.43 0.0020 0.05 13.64 0.72 10.98 13.65 149.84 2.89 1.01 0.00 0.00 1.74 0 TRUE 0.92 536.23 549.39 OK -13.16 110 543.60 24 10.98 36.21 0.0020 0.07 13.65 0.72 10.99 14.58 160.21 3.30 1.15 92.69 2.31 4.19 0 TRUE 2.17 545.]] 560.62 OK -14.86 112 549.18 24 10.99 23.67 0.0020 0.05 14.58 0.82 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.82 0 TRUE 0.45 WJM 560.76 OK -11.12 114 1 1 531.85 15 1 0.99 193.85 1 0.0002 0.02 1 6.29 1 0.15 0.40 1 5.90 1 2.37 1 0.54 0.19 1 1.50 1 0.00 0.34 10.4457 1 TRUE 1 0.24 532.101 538.55 1 OK -6.46 116 1 1 535.24 1 15 1 0.40 1108.381 0.0000 1 0.00 1 5.90 1 0.14 1 0.20 1 4.15 1 0.81 1 0.27 1 0.09 1 92.68 1 0.19 1 0.42 10.540891 TRUE 1 0.27 1 535.51 1 546.37 1 OK -10.85 118 1 1 541.81 1 15 1 0.20 1 50.26 1 0.0000 1 0.00 1 4.15 1 0.07 1 0.00 1 0.00 1 0.00 1 0.00 1 0.00 1 0.00 1 0.00 1 0.07 10.086961 TRUE I 0.D4 I 541.85 I 548.74 I OK -0So 120 1 530.34 1 15 1 0.79 1171.021 0.0001 1 0.02 1 3.79 1 0.06 1 0.28 1 4.91 1 1.39 1 0.37 1 0.13 1 8.92 1 0.05 1 0.24 10.305951 TRUE 1 0.17 1 530.51 1 535.89 1 OK -5.37 122 532.15 15 0.28 50.96 0.0000 0.00 4.91 0.09 0.00 0.00 0.00 0.00 0.00 0.00 1 0.00 1 0.09 10.121671 TRUE 1 0.06 1 532.21 1 541.43 1 OK -9.21 128 533.02 12 0.04 9.82 0.0000 0.00 2.26 0.02 0.00 0.00 0.00 0.00 0.00 0.00 1 0.00 1 0.02 10.0258 1 TRUE 1 0.03 1533.05 1 536.65 1OK -3.s 125B 535.19 15 0.42 29.61 0.0000 0.00 2.47 0.02 0.31 2.24 0.69 0.08 0.03 0.79 1 0.00 1 0.05 10.066251 TRUE 1 0.03 1 535.22 1 538.99 1 OK -3.]] 126 535.44 15 0.31 39.07 0.0000 0.00 2.24 0.02 0.00 0.00 0.00 0.00 0.00 0.00 1 0.00 1 0.02 1 0.0254 1 TRUE 1 0.01 1 535.451 538.99 1 OK -3.54 202 555.98 30 26.38 9.73 0.0035 0.03 12.37 0.59 11.13 5.87 65.29 0.53 0.19 92.92 0.37 1.16 0 TRUE 0.61 556.59 560.06 OK -3.47 204 555.59 24 10.78 193.56 0.0019 0.37 5.83 0.13 8.05 5.43 43.69 0.45 0.16 15.36 0.09 0.38 0 TRUE 0.56 557.16 559.88 OK -2.]2 206 557.16 24 8.05 6].]9 0.0011 0.07 5.43 0.11 6.45 5.13 33.09 0.41 0.14 41.71 0.18 0.43 0.56337 TRUE 0.35 557.51 558.50 OK -0.99 208 557.51 21 6.45 193.29 0.0014 0.27 5.13 0.10 4.84 8.08 39.08 1.01 0.35 84.99 0.67 1.13 1.46387 TRUE 1.00 558.52 558.71 OK -0.2 212 558.52 15 4.84 73.83 0.0048 0.35 8.08 0.25 3.97 4.49 17.82 0.31 0.11 6.05 0.02 0.38 0.4964 TRUE 0.60 559.12 560.10 OK -0.98 214A 559.12 15 3.97 125.92 0.0032 0.40 4.49 0.08 0.16 1.90 0.30 0.06 0.02 89.85 0.D4 0.14 0.17857 TRUE 0.49 559.61 560.44 OK -0.83 214C 559.61 12 0.16 140.13 0.0000 0.00 1.90 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01828 TRUE 0.01 559.62 560.82 OK -1.2 218 1 1 556.59 1 24 1 11.13 1120.911 0.0021 1 0.25 1 5.87 1 0.13 1 0.00 1 0.00 1 0.00 1 0.00 1 0.00 1 0.00 1 0.00 1 0.13 1 0 1 TRUE 1 0.32 1556.91 1 551.26 1 OK 4.35 215B 557.16 1 12 1 0.24 1 11.61 1 0.0000 1 0.00 1 3.50 1 0.05 1 0.17 1 2.49 1 0.43 1 0.10 1 0.03 1 23.06 1 0.03 1 0.11 10.143211 TRUE 1 0.07 1 557.23 1 559.14 1 OK -1.92 216 557.23 1 12 1 0.17 1102.701 0.0000 1 0.00 1 2.49 1 0.02 1 0.00 1 0.00 1 0.00 1 0.00 1 0.00 1 0.00 1 0.00 1 0.02 10.031291 TRUE 1 0.03 1 557.26 1 560.50 1 OK -3.24 302 542.88 1 15 1 2.01 141.19 1 0.0008 1 0.03 1 11.24 1 0.49 1 0.00 1 0.00 1 0.00 1 0.00 1 0.00 1 0.00 1 0.00 1 0.49 1 0 1 TRUE 1 0.52 1 543.41 1 552.19 1 OK 402 1 549.52 1 15 1 2.19 1 ]3.6] 1 0.0010 1 0.07 1 7.51 1 0.22 1 0.90 1 3.93 1 3.52 1 0.24 1 0.08 1 89.44 1 0.17 1 0.47 10.611391 TRUE 1 0.38 1 549.90 1 556.94 1 OK -7.04 404 1 551.96 1 15 1 0.90 1204.431 0.0002 1 0.03 1 3.93 1 0.06 1 0.00 1 0.00 1 0.00 1 0.00 1 0.00 1 0.00 1 0.00 1 0.06 1 0.0T84 I TRUE 1 0.07 1 552.03 1 557.68 1 OK -5.65 502 549.52 15 1.32 1 13.81 1 0.0004 1 0.00 1 3.42 1 0.05 1 0.82 1 2.99 1 2.44 1 0.14 1 0.05 1 89.95 1 0.10 1 0.19 10.248141 TRUE 1 0.13 1 549.65 1 551.85 1 OK -2.2 504 549.65 15 0.82 1190.191 0.0001 1 0.03 1 2.99 1 0.03 1 0.00 1 0.00 1 0.00 1 0.00 1 0.00 1 0.00 1 0.00 1 0.03 10.134504 1 TRUE 1 0.07 1 549.72 1 551.00 1 OK -1.28 000��o�©v�oo. Mal ■-■■_,ME 0 Site ulta(Water Quality Compliance) Area LM1x amlay w nlay nMe or uyyMe or aMa TwaMwitt VMumalR°I aYs RunoR MJuaim Volume and TP By P'aWRe Area mlx'I wmO ne l�xMl u%u l�xMl TotalP Ihlns mao0Yn1 am ONnI reenOYnl- eml�xMt Total MWogan lau lrl rm4un Purymeel maolVvrl tno l�xMl mm OaMl Virginia Ruiner Reduction Method Woftheet DEC, Virginia Runoff Reduction Method Re -Development Compliance Spreadsheet - Version 3.0 LIMP Design Specifications List: 2013 Draft Stds & Specs Site Summary Project Title: Boys & Girls Club Drivers Ed Date: 44130 Total Rainfall (in): 43 Total Disturbed Acreage: 5.10 Site Land Cover Summary Pre-ReDevelopment Land Cover (acres) A soils BSolis CSOIIs DSoils Totals %of Total Forest/Open (acres) 0.48 0.00 0.00 0.37 0.85 17 Managed Turf(acres) 1.01 1.00 0.00 0.27 2.28 45 Impervious Cover (acres) 0.91 0.84 0.00 0.22 1.97 39 5.10 100 Post-ReDevelopment Land Cover (acres) A soils BSoils CSOIIs DSolls Totals %of Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0 Managed Turri8or ) 1.26 1.39 0.00 0.22 2.87 56 Impervious Cover (acres) 1.14 0.45 0.00 0.64 2.23 44 5.10 100 Site Tv and Land Cover Nutrient Loads Final Port -Development Post- Post Adjusted Pre- (Post-ReDevelopment ReDevelopment Development ReDevelopment Impervious) &New lm pe ) (New Impervious) Site Rv 0.52 0.49 0.95 0.49 Treatment Volume(ft) 9,585 8,688 897 8,570 TP Load(lb/yr) 6.02 5.46 0.56 5.38 Total TP Load Reduction Required (lb/yr) 1.61 1.15 0.46 Final Post-Developmem Load (Post-ReDevelopment & New Impervious) Pre- ReDevelopment TN Load (Ib/yr) 43.08 37.83 Pre- ReDevelopment Final Post -Development Post-ReDevelopment TP TP Load per acre TP Load per acre Load per acre (lb/acre/yr) (lb/acre/yr) (lb/acre/yr) 1.11 1.18 1.13 Summary Print Virginia Runoff Reduction Method] Woftheet Site Compliance Summary Maximum% Reduction Required Below 20% Pre-ReDevelopment Load] Total Runoff Volume Reduction (k') 0 Total TP Load Reduction Achieved (lb/yr) 0.00 Total TN Load Reduction Achieved (lb/yr) 0.00 Remaining Post Development TP Load 6.02 (lb/yr) Remaining TP Load Reduction (lb/yr) 1.61 Required Summary Print Virginia Runoff Retlucfion Method Woftheet Drainage Area Summary D.A. A D.A. B D.A. C D.A. D D.A. E Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0.00 Managed Turf(acros) 0.00 0.00 0.00 0.00 0.00 0.00 Impervious Corer(acres) 0.00 0.00 0.00 0.00 0.00 0.00 Total Area (acres) 0.00 0.00 0.00 0.00 0.00 0.00 Drainage Area Compliance Summary DA. A D.A. B DA. C D.A. D D.A. E Total TP Load Reduced (lb/yr) 1 0.00 0.00 1 0.00 1 0.00 0.00 0.00 TN Load Reduced (lb/yr) 1 0.00 0.00 1 0.00 1 0.00 0.00 0.00 Summary Print Virginia Runoff Reduction Method Worksheet ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Runoff Volume and CN Calculations 1-year storm 2-year storm 10-year storm Target Rainfall Event (in) 1 3.04 3.68 5.57 Drainage Areas RV & CN Drainage Area A Drainage Area R Drainage Area C Drainage Area D Drainage Area E CN 0 0 0 0 0 RR (fta) 0 0 0 0 0 I -year return period RV wa RR(wzin) 0.00 0.00 0.00 0.00 0.00 RV w RR(wiAn) 0.00 0.00 0.00 0.00 0.00 CN ad(urted 0 0 0 0 0 2-year return period RVwo RR (wzin) 0.00 0.00 0.00 0.00 0.00 RV w RR (wzin) 0.00 0.00 0.00 0.00 0.00 CN adjusted 0 0 0 0 0 10-year return period RV wo RR(Zin) 0.00 0.00 0.00 0.00 0.00 RV w RR(wzin) 0.00 0.00 0.00 0.00 0.00 CN adjusted 0 0 0 0 0 Summary Print 5S 2S Pre-3 to POA1 7$ 6S Pre-6 to Offsite Pre-2 to POA1 Pre-4 to POA1 17 4L 1 S O POA1 $S Pre -1 to POA1 Pre -5 to POA1 5L POA1 (Onsite) Subcat Reach Aon Llnk Pre Prepared by Timmons Group Printed 2/4/2021 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 1.870 39 >75% Grass cover, Good, HSG A (1S, 2S, 5S, 6S, 7S, 8S) 1.820 61 >75% Grass cover, Good, HSG B (1S, 2S, 5S, 8S) 1.070 80 >75% Grass cover, Good, HSG D (1S, 6S, 7S, 8S) 0.240 96 Gravel surface, HSG D (6S) 4.750 98 Paved parking (1S, 2S, 5S, 6S, 7S, 8S) 2.820 30 Woods, Good, HSG A (1S, 6S) 0.440 77 Woods, Good, HSG D (1 S, 6S, 7S) 13.010 67 TOTAL AREA Pre Prepared by Timmons Group Printed 2/4/2021 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 4.690 HSG A 1 S, 2S, 5S, 6S, 7S, 8S 1.820 HSG B 1S, 2S, 5S, 8S 0.000 HSG C 1.750 HSG D 1S, 6S, 7S, 8S 4.750 Other 1S, 2S, 5S, 6S, 7S, 8S 13.010 TOTAL AREA Pre Prepared by Timmons Group Printed 2/4/2021 Ground Covers (all nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 1.870 1.820 0.000 1.070 0.000 4.760 >75% Grass cover, Good 1S, 2S, 5S, 6S, 7S, 8S 0.000 0.000 0.000 0.240 0.000 0.240 Gravel surface 6S 0.000 0.000 0.000 0.000 4.750 4.750 Paved parking 1S, 2S, 5S, 6S, 7S, 8S 2.820 0.000 0.000 0.440 0.000 3.260 Woods, Good 1S, 6S, 7S 4.690 1.820 0.000 1.750 4.750 13.010 TOTAL AREA Pre Prepared by Timmons Group Printed 2/4/2021 Pipe Listing (all nodes) Line# Node In -Invert Out -Invert Length Slope n Diam/Width Height Inside -Fill Number (feet) (feet) (feet) Wit) (inches) (inches) (inches) 1 is 0.00 0.00 22.0 0.1000 0.011 24.0 0.0 0.0 2 2S 0.00 0.00 89.0 0.1690 0.015 15.0 0.0 0.0 3 2S 0.00 0.00 382.0 0.0240 0.015 24.0 0.0 0.0 Pre Type 11 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Group Printed 2/4/2021 HydroCAD® 10.00-20 s/n 08663 ©2017 HydroCAD Software Solutions LLC Page 6 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment1S: Pre -1 to POA1 Runoff Area=3.480 ac 34.20% Impervious Runoff Depth>0.56" Flow Length=759' Tc=7.6 min CN=66 Runoff=2.85 cfs 0.163 of Subcatchment2S: Pre-2 to POA1 Runoff Area=1.350 ac 51.11 % Impervious Runoff Depth>1.22" Flow Length=756' Tc=8.8 min CN=79 Runoff=2.60 cfs 0.137 of Subcatchment5S: Pre-3 to POA1 Runoff Area=2.380 ac 36.13% Impervious Runoff Depth>0.65" Tc=6.0 min CN=68 Runoff=2.49 cfs 0.128 of Subcatchment6S: Pre-4 to POA1 Runoff Area=3.090 ac 1.62% Impervious Runoff Depth>0.01" Flow Length=503' Tc=8.9 min CN=42 Runoff=0.00 cfs 0.001 of Subcatchment7S: Pre-6 to Offsite Runoff Area=0.270 ac 33.33% Impervious Runoff Depth>1.34" Tc=6.0 min CN=81 Runoff=0.63 cfs 0.030 of Subcatchment8S: Pre -5 to POA1 Runoff Area=2.440 ac 76.64% Impervious Runoff Depth>2.29" Tc=6.0 min CN=93 Runoff=9.11 cfs 0.466 of Link 4L: POA1 Inflow=16.69 cfs 0.895 of Primary=16.69 cfs 0.895 of Link 5L: POA1 (Onsite) Primary=0.00 cfs 0.000 of Total Runoff Area = 13.010 ac Runoff Volume = 0.925 of Average Runoff Depth = 0.85" 63.49% Pervious = 8.260 ac 36.51% Impervious = 4.750 ac Pre Type 11 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 1S: Pre -1 to POM Runoff = 2.85 cfs @ 12.01 hrs, Volume= 0.163 af, Depth> 0.56" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1 YR Rainfall=3.04" Area (ac) CN Description 1.190 98 Paved parking 0.480 30 Woods, Good, HSG A 0.350 77 Woods, Good, HSG D 0.950 39 >75% Grass cover, Good, HSG A 0.140 80 >75% Grass cover, Good, HSG D 0.370 61 >75% Grass cover, Good, HSG B 3.480 66 Weighted Average 2.290 65.80% Pervious Area 1.190 34.20% Impervious Area Tc Length Slope Velocity Capacity Description 5.3 30 0.0070 0.09 Sheet Flow, Grass: Short n= 0.150 P2= 3.70" 1.9 437 0.0360 3.85 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.0 22 0.1000 26.91 84.55 Pipe Channel, 24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50' n= 0.011 Concrete pipe, straight & clean 0.4 270 0.1480 12.39 6.19 TrapNee/Rect Channel Flow, Bot.W=0.00' D=0.50' Z= 2.0'/' Top.W=2.00' n= 0.017 Concrete, unfinished 7.6 759 Total Pre Type/1 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Group Printed 2/4/2021 Subcatchment 1S: Pre -1 to POA7 Hydrograph ❑ Runoff type',II 24yhr, 1: YR kaiintall=3.04" Ruihoff Arda=3A80 66 2 Ruooff Vo,Mumo=0.163', of Ikunoff bepth>6.56'� Flout Le;not&759' ' 0, N=661 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Time (hours) Pre Type 11 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 2S: Pre-2 to POM Runoff = 2.60 cfs @ 12.01 hrs, Volume= 0.137 af, Depth> 1.22" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1 YR Rainfall=3.04" Area (ac) CN Description 0.690 98 Paved parking 0.030 39 >75% Grass cover, Good, HSG A 0.630 61 >75% Grass cover, Good, HSG B 1.350 79 Weighted Average 0.660 48.89% Pervious Area 0.690 51.11% Impervious Area Tc Length Slope Velocity Capacity Description 7.3 100 0.0350 0.23 Sheet Flow, Grass: Short n= 0.150 P2= 3.70" 0.7 185 0.0430 4.21 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.1 89 0.1690 18.75 23.02 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.015 Concrete sewer w/manholes & inlets 0.7 382 0.0240 9.67 30.37 Pipe Channel, 24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50' n= 0.015 Concrete sewer w/manholes & inlets 8.8 756 Total Pre Type/1 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Grow Printed 2/4/2021 Subcatchment 2S: Pre-2 to POA7 Hydrograph 210 ff type',II �4yhr, 1: YR kaintall=3A4" -REMOWAr6a".150 ad Ru"off Vol urnQ=0.1,3T11, of Ikunoff bepth>1.227 Flo%N Le;nOt&756' GN=79 4 5 6 7 8 9 10 11 12 13 Time (hours) 6 ■ Runoff Pre Type 11 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 5S: Pre-3 to POM Runoff = 2.49 cfs @ 11.99 hrs, Volume= 0.128 af, Depth> 0.65" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1 YR Rainfall=3.04" Area (ac) CN Description 0.860 98 Paved parking 0.710 39 >75% Grass cover, Good, HSG A 0.810 61 >75% Grass cover, Good, HSG B 2.380 68 Weighted Average 1.520 63.87% Pervious Area 0.860 36.13% Impervious Area Tc Length Capacity Description 6.0 Direct Entry, Subcatchment 5S: Pre-3 to POM Hydrograph ❑ Runoff Type II 24-hr 1 YR Rainfall=3.04" 21 1 II 1 Runoff Area=2.380 ac Runoff Volume=0.128 of Runoff Depth>0.65" LL Tc=6.0 min 'I I I1 A CN=68 9 1 2 3 4 5 6 7 8 9 19 11 12 13 14 15 16 17 18 19 29 21 22 23 24 Time (hours) Pre Type 11 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 6S: Pre-4 to POM Runoff = 0.00 cfs @ 24.00 hrs, Volume= 0.001 af, Depth> 0.01" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1 YR Rainfall=3.04" Area (ac) CN Description 0.050 98 Paved parking 0.240 96 Gravel surface, HSG D 2.340 30 Woods, Good, HSG A 0.070 77 Woods, Good, HSG D 0.130 39 >75% Grass cover, Good, HSG A 0.260 80 >75% Grass cover, Good, HSG D 3.090 42 Weighted Average 3.040 98.38% Pervious Area 0.050 1.62% Impervious Area Tc Length Slope Velocity Capacity Description 6.5 100 0.1200 0.26 Sheet Flow, Grass: Dense n= 0.240 P2= 3.70" 2.1 263 0.1800 2.12 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 0.3 140 0.0570 7.43 44.57 TrapNee/Rect Channel Flow, Bot.W=5.00' D=1.00' Z= 1.0'/' Top.W=7.00' n= 0.040 Windinq stream, pools & shoals 8.9 503 Total Pre Type/1 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Grow Printed 2/4/2021 Subcatchment 6S: Pre-4 to POA7 Hydrograph 0.004 ----1--1--r--r--i--r r--r - -:- :-- i-- r - -r- -:- :--7--r--r----1--1--r-- - �__ �__ __ __�__ �__ �__ __� ___ _1L____-_ �__ �__ �__ �__ 1__ __ ■Runoff 0.004 0.004 - b-r--r--r__,___,__y__r__r__,___,__.�__r__r__,__y__r__ _ ?B � 0.004 _________________ �_ __ ---- �r __ -r--r--r--,--i__r--Fii---i_ r 0.004 -� -9-TICtain�fall J�'�--;------}--------1_-1-----�-- -i-- 0.003 -'_________�__�__�__�___�__�__*__�__�__�_ 0.003 -Ruh off-Ar &�3 090,ad _ �__-__r__-__;__-__7__7__7_ �__ ' 0.003 - _1__1 __1__ �__1__I__I__'-- �__ 1__l__I __ �__�I__�__ __ �__ __II 0.003 -I.Ui Off VQJUQa 1.O0f a --i---_'__ '_-'--i--L---i--i-- 0.003 ._. 0.002 r__i __i__ 1__ r__ r- __i__1__1__r i__r__1__r__ -k unaff-bgptkl OL01'' 0.002 ___-_i---- c ----- } } LL 0.002 -FlOw'L6ngth.=503'-l--:- 0.002 -r-.r_ i--r--r--r__,__ -------- 0.002 -=i779 -7"IFtn m ----+--'i--r-----}--�i --�------ -------------- N=d2 --r--i--r--r--r-- Ooo _ r __r __r__i __i__ i__i __i __i ____ __r __________ 0.001 - '--J----`--`---J----`--'-- �__�__`--`-i-------i--i-- 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Time (hours) Pre Timmons Type 11 24-hr 1 YR Rainfall=3.04" Summary for Subcatchment 7S: Pre-6 to Offsite Runoff = 0.63 cfs @ 11.97 hrs, Volume= 0.030 af, Depth> 1.34" Printed 2/4/2021 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1 YR Rainfall=3.04" Area (ac) CN Description 0.020 77 Woods, Good, HSG D 0.130 80 >75% Grass cover, Good, HSG D 0.030 39 >75% Grass cover, Good, HSG A 0.090 98 Paved parking 0.270 81 Weighted Average 0.180 66.67% Pervious Area 0.090 33.33% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, 91 Subcatchment 7S: Pre-6 to Offsite Hydrograph I__ 00 h __J__1__-----J_ 1 IIIIIII I II ype nllz =r�r I I I I I I 1 YRI Rainfall=3.041' I I I I I I I I I Runb_ff-rAfe6=Q.270ra1�_ L RMnQff'V4P4MfftO=0.030-cjf L _ -Ikunoff-IlDe'pilr>11:34,'- I I I I I I I I I I I I I I I I I I I I I I -I- I � � - I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I Time (horns) ■ RunoR Pre Type 11 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 8S: Pre -5 to POM Runoff = 9.11 cfs @ 11.96 hrs, Volume= 0.466 af, Depth> 2.29" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1 YR Rainfall=3.04" Area (ac) CN Description 1.870 98 Paved parking 0.020 39 >75% Grass cover, Good, HSG A 0.010 61 >75% Grass cover, Good, HSG B 0.540 80 >75% Grass cover, Good, HSG D 2.440 93 Weighted Average 0.570 23.36% Pervious Area 1.870 76.64% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 8S: Pre -5 to POM Hydrograph I I I I 10 I I I I J- 9.11 cfa __J__L__L__L__I, I I I I I I I I I I I I I I 9 ' Type II 24-hr I I I I I I 1 1 1 1 I I I I I 8 1 YR Rainfall=3.04" I I I I I ---"--"--'--'--' Runoff Area=2.440 ac I I I I I -- Runoff Volume=0.466 of 5 Runoff Depth>2.29" 6 I I I I I I 3 I I I I I I I I I I I I I -_-------- I__1__L__L__I_____ T Tz=6.0 min LL I I I I I I I I I I I I 4 CN=93 I I I I I I 1 1 1 1 1 1 1 3 I 2 ' I I I I I I I I I I 11 12 13 Time (hours) ❑ Runoff Pre Type 11 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Group Printed 2/4/2021 Summary for Link 4L: POM Inflow Area = 12.740 ac, 36.58% Impervious, Inflow Depth > 0.84" for 1 YR event Inflow = 16.69 cfs @ 11.98 hrs, Volume= 0.895 of Primary = 16.69 cfs @ 11.98 hrs, Volume= 0.895 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 4L: POM Hydrograph ' I I I I I I I I I I 18.89 Cs I 11111 889�° -inflow Area=12.740 ac I I I I I I , ,q I � _L__I L _y + _ _I _+ _ I _ _I 12 , _ 8 , I g _F_ 5 �• __I__J__+__F__I___I__+__H__I__J_ q � , Time (hours) ❑ Inflow ❑ Primary Pre Type 11 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Group Printed 2/4/2021 Summary for Link 5L: POM (Onsite) Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 5L: POM (Onsite) Hydrograph ❑ Primary 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pre Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 2/4/2021 HydroCAD® 10.00-20 s/n 08663 ©2017 HydroCAD Software Solutions LLC Page 18 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment1S: Pre -1 to POA1 Runoff Area=3.480 ac 34.20% Impervious Runoff Depth>0.90" Flow Length=759' Tc=7.6 min CN=66 Runoff=4.91 cfs 0.260 of Subcatchment2S: Pre-2 to POA1 Runoff Area=1.350 ac 51.11 % Impervious Runoff Depth>1.70" Flow Length=756' Tc=8.8 min CN=79 Runoff=3.66 cfs 0.192 of Subcatchment5S: Pre-3 to POA1 Runoff Area=2.380 ac 36.13% Impervious Runoff Depth>1.01" Tc=6.0 min CN=68 Runoff=4.06 cfs 0.200 of Subcatchment6S: Pre-4 to POA1 Runoff Area=3.090 ac 1.62% Impervious Runoff Depth>0.06" Flow Length=503' Tc=8.9 min CN=42 Runoff=0.02 cfs 0.015 of Subcatchment7S: Pre-6 to Offsite Runoff Area=0.270 ac 33.33% Impervious Runoff Depth>1.85" Tc=6.0 min CN=81 Runoff=0.86 cfs 0.042 of Subcatchment8S: Pre -5 to POA1 Runoff Area=2.440 ac 76.64% Impervious Runoff Depth >2.91" Tc=6.0 min CN=93 Runoff=11.39 cfs 0.591 of Link4L: POA1 Inflow=23.61 cfs 1.257 of Primary=23.61 cfs 1.257 of Link 5L: POA1 (Onsite) Primary=0.00 cfs 0.000 of Total Runoff Area = 13.010 ac Runoff Volume = 1.299 of Average Runoff Depth = 1.20" 63.49% Pervious = 8.260 ac 36.51% Impervious = 4.750 ac Pre Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 1S: Pre -1 to POM Runoff = 4.91 cfs @ 12.00 hrs, Volume= 0.260 af, Depth> 0.90" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2 YR Rainfall=3.68" Area (ac) CN Description 1.190 98 Paved parking 0.480 30 Woods, Good, HSG A 0.350 77 Woods, Good, HSG D 0.950 39 >75% Grass cover, Good, HSG A 0.140 80 >75% Grass cover, Good, HSG D 0.370 61 >75% Grass cover, Good, HSG B 3.480 66 Weighted Average 2.290 65.80% Pervious Area 1.190 34.20% Impervious Area Tc Length Slope Velocity Capacity Description 5.3 30 0.0070 0.09 Sheet Flow, Grass: Short n= 0.150 P2= 3.70" 1.9 437 0.0360 3.85 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.0 22 0.1000 26.91 84.55 Pipe Channel, 24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50' n= 0.011 Concrete pipe, straight & clean 0.4 270 0.1480 12.39 6.19 TrapNee/Rect Channel Flow, Bot.W=0.00' D=0.50' Z= 2.0'/' Top.W=2.00' n= 0.017 Concrete, unfinished 7.6 759 Total Pre Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Grow Printed 2/4/2021 Subcatchment IS: Pre -1 to POA7 Hydrograph ❑ Runoff ------------- ',----------,-- 991 s type',II 24yhr, 2 YRJ3aintali=i68 - -- ku�off Arba=3'480 iac': Ru"Oft VOUMQ=0.260'1 of Fkunoff bepth>6.010 FloMr Le'noth,759' ______________ Tc=1.,6 M!" GN66'6 4 5 6 7 8 9 10 11 12 13 14 15 16 Time (hours) Pre Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 2S: Pre-2 to POM Runoff = 3.66 cfs @ 12.00 hrs, Volume= 0.192 af, Depth> 1.70" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2 YR Rainfall=3.68" Area (ac) CN Description 0.690 98 Paved parking 0.030 39 >75% Grass cover, Good, HSG A 0.630 61 >75% Grass cover, Good, HSG B 1.350 79 Weighted Average 0.660 48.89% Pervious Area 0.690 51.11% Impervious Area Tc Length Slope Velocity Capacity Description 7.3 100 0.0350 0.23 Sheet Flow, Grass: Short n= 0.150 P2= 3.70" 0.7 185 0.0430 4.21 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.1 89 0.1690 18.75 23.02 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.015 Concrete sewer w/manholes & inlets 0.7 382 0.0240 9.67 30.37 Pipe Channel, 24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50' n= 0.015 Concrete sewer w/manholes & inlets 8.8 756 Total Pre i Timmons Type 11 24-hr 2 YR Rainfall=3.68" Subcatchment 2S: Pre-2 to POA7 Hydrograph L type ',Il 24yhr, 2 Yk-kaffitah=IAA'-- -- Ruiioff Artsa=1,350 iac' Ru"Off VoMumo=Q.192', of -4kurioff bept��.!0'l- 06v Le;noth-1756' 7c=8.,8 rain 4 5 Printed 2/4/2021 11 12 13 Time (hours) ❑ Runoff Pre Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 5S: Pre-3 to POM Runoff = 4.06 cfs @ 11.98 hrs, Volume= 0.200 af, Depth> 1.01" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2 YR Rainfall=3.68" Area (ac) CN Description 0.860 98 Paved parking 0.710 39 >75% Grass cover, Good, HSG A 0.810 61 >75% Grass cover, Good, HSG B 2.380 68 Weighted Average 1.520 63.87% Pervious Area 0.860 36.13% Impervious Area Tc Length Capacity Description t-f..x 6.0 Direct Entry, Subcatchment 5S: Pre-3 to POM Hydrograph I I I I I I I I I I I I I I I 4 66 c(s 4 Type II 24-hr I I 2 YR Rainfall=3.68" Runoff Area=2.380 ac 3 Runoff Volume=0.200 of Runoff Depth>1.01" F 2 Tc=6.0 min CN=68 9 1 2 3 4 5 6 7 8 9 19 11 12 13 14 15 16 17 18 19 29 21 22 23 24 Time (hours) ❑ Runoff Pre Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 6S: Pre-4 to POM Runoff = 0.02 cfs @ 15.38 hrs, Volume= 0.015 af, Depth> 0.06" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2 YR Rainfall=3.68" Area (ac) CN Description 0.050 98 Paved parking 0.240 96 Gravel surface, HSG D 2.340 30 Woods, Good, HSG A 0.070 77 Woods, Good, HSG D 0.130 39 >75% Grass cover, Good, HSG A 0.260 80 >75% Grass cover, Good, HSG D 3.090 42 Weighted Average 3.040 98.38% Pervious Area 0.050 1.62% Impervious Area Tc Length Slope Velocity Capacity Description 6.5 100 0.1200 0.26 Sheet Flow, Grass: Dense n= 0.240 P2= 3.70" 2.1 263 0.1800 2.12 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 0.3 140 0.0570 7.43 44.57 TrapNee/Rect Channel Flow, Bot.W=5.00' D=1.00' Z= 1.0'/' Top.W=7.00' n= 0.040 Windinq stream, pools & shoals 8.9 503 Total Pre Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Grow Printed 2/4/2021 Subcatchment 6S: Pre-4 to POA7 Hydrograph 0.02 --I----- I -- I --I--I---I-- I -- I ------- �-- I --I - �----- ---------- -- -------- --� --i ---- I -- I --I ------- ---------- --I---I-- I --- -- T ❑Runoff 0.019 0.018 0.017 - J i------�-----'--i- $' -------'-- I --- 0.0,6 -2YR,Rauafall= 0.015 " -RunoffArMPf3.-09Wad--;----- 0.014 ____. __r__r__,__y__T__ r__,___,__y__ _r__,___,__ y__ r__ r__,__ y__Y__r__ 0.013 " -�M jOff Vglu�np--0.01 ofr__ _r__- _--- _r__r_-IF _ r7_r__ 0.012 -----I----�7r--r- -r-_-_r -__- 'u0 tni# ep�h>006r I _0.0,1 II 0.01 I 1 ' -W'Linu I --__ I-_�'rI JrJI o.00s 1t - 0.008 i _im_.1�'1-----i--L--'---- ---------'--i--1L------i--i-- 0.007 _F _, _, _� _} _F _, _} _} _} 0.005 -+ -} r- I -� -+ -Y -I -I -r -I -I -+ -+ -r 0.004 -Y -Y r- i -y -+- Y r -r -I -I -+ -+ -r I -I -+ -+ -Y 0.003 0.002 4 5 6 7 8 9 10 11 12 13 Time (hours) Pre Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 7S: Pre-6 to Offsite Runoff = 0.86 cfs @ 11.97 hrs, Volume= 0.042 af, Depth> 1.85" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2 YR Rainfall=3.68" Area (ac) CN Description 0.020 77 Woods, Good, HSG D 0.130 80 >75% Grass cover, Good, HSG D 0.030 39 >75% Grass cover, Good, HSG A 0.090 98 Paved parking 0.270 81 Weighted Average 0.180 66.67% Pervious Area 0.090 33.33% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 7S: Pre-6 to Offsite I I I I I I 1 I I I I I I 0.85I i I I I I I I 0.75 0.65 I 0.6 0.55 __I_ 0.5 0 0.45 ' LL _. Hydrograph J__1__L__l__I__J__J__1__ L__I__ — I— I 086cfs __I__I__I__I __I___I___I__I__I__I __I__ 4 1__l__I u12 - _ I I I I I I I I �� I �lfR Rainfa11#3.68" Runoff Area=0.270 alp 0.3 _ _ I_ __ __ ____ 0.25 I__ I_ __ __ I I ______________________ I I 0.2 0.15 I 11 I I I I I I I I I 0.1 -#runoff Volame=D.QQ-cj#- Runoff-DeptFt>1.S5!"_ i Tc=6.0 min --I- CN=81- IIIIIII I I I I I ___________ __ _____________ I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I r--r--r- Time (horns) ■ RunoH Pre Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Grow Printed 2/4/2021 Summary for Subcatchment 8S: Pre -5 to POA1 Runoff = 11.39 cfs @ 11.96 hrs, Volume= 0.591 af, Depth> 2.91" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2 YR Rainfall=3.68" Area (ac) CN Descriotion " 1.870 98 Paved parking 0.020 39 >75% Grass cover, Good, HSG A 0.010 61 >75% Grass cover, Good, HSG B 0.540 80 >75% Grass cover, Good, HSG D 2.440 93 Weighted Average 0.570 23.36% Pervious Area 1.870 76.64% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 8S: Pre -5 to POA1 Hydrograph __�_ __ - __'__'_ �--�--�--�---'--�--i--'--�--�-- ■Runoff 12 n as cra - -- -- -- --}-- -- ---- ;-- --, -- -iTyp6 it 24-1 r - 11 I I I I I I I 10 2 YR Ral , Q[43.Wt 9 ' :Runoff Areti=2."O at; a _,R4nOff-_VQII m;e=0.$9�1 a-f Runoff Deph>2.91, r 6 TAC fi-tnih-- IPN==93- 3 2 11 12 13 Time (hours) Pre Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 2/4/2021 LJ.,.1.. AM4 n nn O/1 . 1, nOCCO /l Ol14LJ...1...!` G I'1 O..N..,..... O.J. d:...... !` Il--- 1. Summary for Link 4L: POM Inflow Area = 12.740 ac, 36.58% Impervious, Inflow Depth > 1.18" for 2 YR event Inflow = 23.61 cfs @ 11.98 hrs, Volume= 1.257 of Primary = 23.61 cfs @ 11.98 hrs, Volume= 1.257 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 4L: POM Hydrograph --I--1 ff-In 26 ----'--'__�__�_____'__�__�__--- 10 Primary 23.61 qe 2461 ------'-----------�--�- 3: s Inflow Area=92.740rac- �III��II 22 III. 20 1 1 1 _____ ____ i I I I i i I I i i I i I I I i i I I I II i I I I I I I I 16 I I I i i I I i i I i I I I i i I I I i I I i i I I i I i I I I i i I I I i 0 12 LL I I I I I I I I I I I I 10 _r__r__r__� i I I I i i I I i I i I I I i I I I i i Time (hours) Pre Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 2/4/2021 Summary for Link 5L: POM (Onsite) Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 5L: POM (Onsite) Hydrograph ❑ Primary 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pre Type II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 2/4/2021 HydroCAD® 10.00-20 s/n 08663 ©2017 HydroCAD Software Solutions LLC Page 30 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment1S: Pre -1 to POA1 Runoff Area=3.480 ac 34.20% Impervious Runoff Depth>2.12" Flow Length=759' Tc=7.6 min CN=66 Runoff=12.25 cfs 0.616 of Subcatchment2S: Pre-2 to POA1 Runoff Area=1.350 ac 51.11 % Impervious Runoff Depth>3.29" Flow Length=756' Tc=8.8 min CN=79 Runoff=7.01 cfs 0.370 of Subcatchment5S: Pre-3 to POA1 Runoff Area=2.380 ac 36.13% Impervious Runoff Depth>2.29" Tc=6.0 min CN=68 Runoff=9.52 cfs 0.455 of Subcatchment6S: Pre-4 to POA1 Runoff Area=3.090 ac 1.62% Impervious Runoff Depth>0.47" Flow Length=503' Tc=8.9 min CN=42 Runoff=1.13 cfs 0.122 of Subcatchment7S: Pre-6 to Offsite Runoff Area=0.270 ac 33.33% Impervious Runoff Depth>3.49" Tc=6.0 min CN=81 Runoff=1.59 cfs 0.079 of Subcatchment8S: Pre -5 to POA1 Runoff Area=2.440 ac 76.64% Impervious Runoff Depth>4.75" Tc=6.0 min CN=93 Runoff=18.04 cfs 0.967 of Link 4L: POA1 Inflow=46.84 cfs 2.529 of Primary=46.84 cfs 2.529 of Link 5L: POA1 (Onsite) Primary=0.00 cfs 0.000 of Total Runoff Area = 13.010 ac Runoff Volume = 2.607 of Average Runoff Depth = 2.41" 63.49% Pervious = 8.260 ac 36.51% Impervious = 4.750 ac Pre Type II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 1S: Pre -1 to POM Runoff = 12.25 cfs @ 12.00 hrs, Volume= 0.616 af, Depth> 2.12" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10 YR Rainfall=5.57" Area (ac) CN Description 1.190 98 Paved parking 0.480 30 Woods, Good, HSG A 0.350 77 Woods, Good, HSG D 0.950 39 >75% Grass cover, Good, HSG A 0.140 80 >75% Grass cover, Good, HSG D 0.370 61 >75% Grass cover, Good, HSG B 3.480 66 Weighted Average 2.290 65.80% Pervious Area 1.190 34.20% Impervious Area Tc Length Slope Velocity Capacity Description 5.3 30 0.0070 0.09 Sheet Flow, Grass: Short n= 0.150 P2= 3.70" 1.9 437 0.0360 3.85 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.0 22 0.1000 26.91 84.55 Pipe Channel, 24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50' n= 0.011 Concrete pipe, straight & clean 0.4 270 0.1480 12.39 6.19 TrapNee/Rect Channel Flow, Bot.W=0.00' D=0.50' Z= 2.0'/' Top.W=2.00' n= 0.017 Concrete, unfinished 7.6 759 Total Pre Type 11 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Grow Printed 2/4/2021 Subcatchment 1S: Pre -1 to POA7 Hydrograph __-__T__r__r__ Runoff __---r-;__;--7--r--rIr--Ir--Ir----r--r--r--r-;�;/__pp�__r__ _ r__ 12 - --li --I�--II--------yp_q__:2�"r- 1L I Q_YRRainfalL��.�7L'__ _L -� df#-ARR�1��1 Ial� runl 10 �--�--II--�--�--�--_--�--I+--II---II- -;-keh=$.48O- 9 1I I I I I I I I I I I I I - R4npffll��fpit =e:$4$-4f a 7 ---;--;--;--r---r--kunofFDipih>242w` 3 - ;--;--7-- r-- --b--I _r- r 6 1FIdw:Ldndth=7W LL I I I 5----J-- -- -- -- ----'---' —-L--L-------TC1%.16Ml"l I I I I I I I I I I I I I I I I 4 N6&_ 3 I I I I I 2 I I I I I I I I I I I I I 4 5 6 7 8 9 10 11 12 13 Time (hours) Pre Type II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 2S: Pre-2 to POM Runoff = 7.01 cfs @ 12.00 hrs, Volume= 0.370 af, Depth> 3.29" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10 YR Rainfall=5.57" Area (ac) CN Description 0.690 98 Paved parking 0.030 39 >75% Grass cover, Good, HSG A 0.630 61 >75% Grass cover, Good, HSG B 1.350 79 Weighted Average 0.660 48.89% Pervious Area 0.690 51.11% Impervious Area Tc Length Slope Velocity Capacity Description 7.3 100 0.0350 0.23 Sheet Flow, Grass: Short n= 0.150 P2= 3.70" 0.7 185 0.0430 4.21 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.1 89 0.1690 18.75 23.02 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.015 Concrete sewer w/manholes & inlets 0.7 382 0.0240 9.67 30.37 Pipe Channel, 24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50' n= 0.015 Concrete sewer w/manholes & inlets 8.8 756 Total Pre Timmons Type 11 24-hr 10 YR Rainfall=5.57" Subcatchment 2S: Pre-2 to POA7 Hydrograph C type',Il �4yhr, 10 YR RainfallT5.,57" Ruoff Arda=1,350 iad RuOoff VoM=4=Q.310', of -fkunofF beplt6>3 $9'l - FIgW Le'n-qW=756' U4.,8 mid 4 5 11 12 13 Time (hours) Printed 2/4/2021 ❑ Runoff Pre Type II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 5S: Pre-3 to POM Runoff = 9.52 cfs @ 11.98 hrs, Volume= 0.455 af, Depth> 2.29" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10 YR Rainfall=5.57" Area (ac) CN Description 0.860 98 Paved parking 0.710 39 >75% Grass cover, Good, HSG A 0.810 61 >75% Grass cover, Good, HSG B 2.380 68 Weighted Average 1.520 63.87% Pervious Area 0.860 36.13% Impervious Area Tc Length Capacity Description Direct Entry, Subcatchment 5S: Pre-3 to POM Hydrograph ❑ Runoff I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 1 I I I I 1 1 1 I 1 I I I I 1 1 1 I 1 I I I I 1 1 1 I I I I I I I I I I I I I I I I I I I 1 I I I I 1 1 I I i 1 I I I I 1 1 I I I 1 1 1 I I I I 1 1 I I I 1 I I I I 1 1 I I I 1 I I I I 1 1 I I 1 I I I I 1 1 I I 1 I I I I 1 1 I I I I I I I I I I I I I I I I I I I I I I Type II 24-hr 10 YR Rainfall=5.57rr Runoff Area=2.380 ac Runoff Volume=0.455 of --,--III--Runoff Depth>2.29" I I Tc=6.0 min I I I I I I I I I I I CN=68 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I--I--Y--4--�--h--h-- I I I I I I I I I I I I 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Time (hours) Pre Type II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 6S: Pre-4 to POM Runoff = 1.13 cfs @ 12.06 hrs, Volume= 0.122 af, Depth> 0.47" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10 YR Rainfall=5.57" Area (ac) CN Description 0.050 98 Paved parking 0.240 96 Gravel surface, HSG D 2.340 30 Woods, Good, HSG A 0.070 77 Woods, Good, HSG D 0.130 39 >75% Grass cover, Good, HSG A 0.260 80 >75% Grass cover, Good, HSG D 3.090 42 Weighted Average 3.040 98.38% Pervious Area 0.050 1.62% Impervious Area Tc Length Slope Velocity Capacity Description 6.5 100 0.1200 0.26 Sheet Flow, Grass: Dense n= 0.240 P2= 3.70" 2.1 263 0.1800 2.12 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 0.3 140 0.0570 7.43 44.57 TrapNee/Rect Channel Flow, Bot.W=5.00' D=1.00' Z= 1.0'/' Top.W=7.00' n= 0.040 Windinq stream, pools & shoals 8.9 503 Total Pre Timmons Type 11 24-hr 10 YR Rainfall=5.57" Subcatchment SS: Pre-4 to POA7 Hydrograph 1.1 crs type',II �4yhr, 1,0 YR RainfallT5:57" Ruoff Aroa=3:60 Ac' Runoff Vo,Mum4=0.1 �11 of Runoff bepth>6.474 Flout: Le;not&503' 7c=8.,0 rni" GN=42 4 5 11 12 13 Time (hours) Printed 2/4/2021 ■ Runoff Pre Type II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 7S: Pre-6 to Offsite Runoff = 1.59 cfs @ 11.97 hrs, Volume= 0.079 af, Depth> 3.49" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10 YR Rainfall=5.57" Area (ac) CN Description 0.020 77 Woods, Good, HSG D 0.130 80 >75% Grass cover, Good, HSG D 0.030 39 >75% Grass cover, Good, HSG A 0.090 98 Paved parking 0.270 81 Weighted Average 0.180 66.67% Pervious Area 0.090 33.33% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 7S: Pre-6 to Offsite Hydrograph Type II 24-hr 10 YR Rainfall=5.57" Runoff Area=0.270 ac Runoff Volume=0.079 of Runoff Depth>3.49" LL h Tc=6.0 min CN=81 11 12 13 Time (horns) ❑ Runoff Pre Type II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 8S: Pre -5 to POM Runoff = 18.04 cfs @ 11.96 hrs, Volume= 0.967 af, Depth> 4.75" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10 YR Rainfall=5.57" Area (ac) CN Description 1.870 98 Paved parking 0.020 39 >75% Grass cover, Good, HSG A 0.010 61 >75% Grass cover, Good, HSG B 0.540 80 >75% Grass cover, Good, HSG D 2.440 93 Weighted Average 0.570 23.36% Pervious Area 1.870 76.64% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 8S: Pre -5 to POM Hydrograph ----- -- -- -- --,-----'I-----I--------- ------- 1 --1__y__4__. ❑Runoff 19 1 1 1 1 1 ___ 18 1 1 Type II 24-1 r- 17 ----16 aA YR Rainfall=5.57"'-- ---- - Ron ffAr"#2 44� ap 13 ____iioftoffFV�A 0.12 _________LJ�Y r•6,6. tiJ��l --- ��r-- _______________________J_`�-_`i__k�o#�Dipily 44 VI_1__I10 ___O IF Q % J _1 _♦ _� _11 1 1 1 1 1 1 1 1 1 1 i 2 - �r---- - - - -'. 11 12 13 Time (hours) Pre Type II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 2/4/2021 HydroCAD® 10.00-20 s/n 08663 @ 2017 HydroCAD Software Solutions LLC Page 40 Summary for Link 4L: POM Inflow Area = 12.740 ac, 36.58% Impervious, Inflow Depth > 2.38" for 10 YR event Inflow = 46.84 cfs @ 11.98 hrs, Volume= 2.529 of Primary = 46.84 cfs @ 11.98 hrs, Volume= 2.529 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 4L: POM Hydrograph I I ____ i__i--i __-____l__i__ _� __I� ____ ❑Inflow I , as sa cfs ❑Primary 4684 cfs Inflow Area=12.74UIIac 45 , I I I 3 l l l l l l l l l i l l l , _r__r__r__r __r_r__r__r _�_ __r__r _r__r__r__r_�__r__r__r__r_ I 30 J__L__,__J__J_ I__J__,__J__1__L_J__J__J__L__J_J__ I I I I I I I I ii2 - r_r_r__r_r __r_r__r__r ___ LL i' 20 i I I i i I I I i I I I i i I I I i Time (hours) Pre Type II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 2/4/2021 Summary for Link 5L: POM (Onsite) Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 5L: POM (Onsite) Hydrograph ❑ Primary 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) 5S Post-3 to PO A1 1S 7P Post -IA to POA1 SWM1 P 1 10S 5P RR Post -1B to POAl SWM2\ \ 8S 6S 9S Post -5 to POA1 Post -2 to POA1 Post4 to POA1 Subcat Reach Aon Llnk 7S Post-6 11S Post-1C to POA1 Post Prepared by Timmons Group Printed 2/4/2021 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 2.120 39 >75% Grass cover, Good, HSG A (5S, 7S, 8S, 9S, 10S, 11S) 2.210 61 >75% Grass cover, Good, HSG B (1S, 5S, 8S, 11S) 1.020 80 >75% Grass cover, Good, HSG D (6S, 7S, 8S, 9S, 10S, 11 S) 0.240 96 Gravel surface, HSG D (6S, 9S) 4.150 98 Paved parking (1S, 6S, 7S, 8S, 10S, 11S) 0.860 98 Paved parking, HSG A (5S) 2.340 30 Woods, Good, HSG A (9S) 0.070 77 Woods, Good, HSG D (9S) 13.010 68 TOTAL AREA Post Prepared by Timmons Group Printed 2/4/2021 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 5.320 HSG A 5S, 7S, 8S, 9S, 10S, 11 S 2.210 HSG B 1S, 5S, 8S, 11S 0.000 HSG C 1.330 HSG D 6S, 7S, 8S, 9S, 10S, 11 S 4.150 Other 1S, 6S, 7S, 8S, 10S, 11S 13.010 TOTAL AREA Post Prepared by Timmons Group Printed 2/4/2021 Ground Covers (all nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 2.120 2.210 0.000 1.020 0.000 5.350 >75% Grass cover, Good 1S, 5S, 6S, 7S, 8S, 9S, 10S, 11S 0.000 0.000 0.000 0.240 0.000 0.240 Gravel surface 6S, 9S 0.860 0.000 0.000 0.000 4.150 5.010 Paved parking 1S, 5S, 6S, 7S, 8S, 10S, 11S 2.340 0.000 0.000 0.070 0.000 2.410 Woods, Good 9S 5.320 2.210 0.000 1.330 4.150 13.010 TOTAL AREA Post Prepared by Timmons Group Printed 2/4/2021 Pipe Listing (all nodes) Line# Node In -Invert Out -Invert Length Slope n Diam/Width Height Inside -Fill Number (feet) (feet) (feet) (ft/ft) (inches) (inches) (inches) 1 5P 549.00 547.23 59.0 0.0300 0.013 24.0 0.0 0.0 2 7P 546.00 541.75 42.5 0.1000 0.013 15.0 0.0 0.0 Post Type 11 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Group Printed 2/4/2021 HydroCAD® 10.00-20 s/n 08663 ©2017 HydroCAD Software Solutions LLC Page 6 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchmentl$: Post -1Ato P0A1 Runoff Area=1.420 ac 23.24% Impervious Runoff Depth>0.74" Tc=6.0 min CN=70 Runoff=1.74 cfs 0.087 of Subcatchment5S: Post-3 to P0A1 Runoff Area=2.380 ac 36.13% Impervious Runoff Depth>0.65" Tc=6.0 min CN=68 Runoff=2.49 cfs 0.128 of Subcatchment6S: Post -2 to P0A1 Runoff Area=0.220 ac 22.73% Impervious Runoff Depth>1.85" Tc=6.0 min CN=88 Runoff=0.69 cfs 0.034 of Subcatchment7S: Post-6 Runoff Area=0.150 ac 46.67% Impervious Runoff Depth>1.48" Tc=6.0 min CN=83 Runoff=0.38 cfs 0.018 of Subcatchment8S: Post -5 to P0A1 Runoff Area=2.440 ac 76.64% Impervious Runoff Depth>2.29" Tc=6.0 min CN=93 Runoff=9.11 cfs 0.466 of Subcatchment9S: Post-4to P0A1 Runoff Area=2.870 ac 0.00% Impervious Runoff Depth=0.00" Flow Length=503' Tc=8.9 min CN=38 Runoff=0.00 cfs 0.000 of Subcatchmentl OS: Post -1 B to P0A1 Runoff Area=1.980 ac 82.83% Impervious Runoff Depth>2.02" Tc=6.0 min CN=90 Runoff=6.70 cfs 0.333 of Subcatchmentl 1 S: Post -1 C to P0A1 Runoff Area=1.550 ac 12.26% Impervious Runoff Depth>0.14" Tc=6.0 min CN=52 Runoff=0.05 cfs 0.018 of Pond 5P: SWM2 Peak EIev=553.07' Storage=0.106 of Inflow=16.50 cfs 0.833 of Outflow=10.97 cfs 0.832 of Pond 7P: SWM1 Peak EIev=547.73' Storage=0.008 of Inflow=1.74 cfs 0.087 of Outflow=1.35 cfs 0.087 of Link 4L: P0A1 Inflow=14.38 cfs 1.064 of Primary=14.38 cfs 1.064 of Total Runoff Area = 13.010 ac Runoff Volume = 1.084 of Average Runoff Depth = 1.00" 61.49% Pervious = 8.000 ac 38.51% Impervious = 5.010 ac Post Type 11 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 1S: Post AA to POA1 Runoff = 1.74 cfs @ 11.99 hrs, Volume= 0.087 af, Depth> 0.74" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1 YR Rainfall=3.04" Area (ac) CN Description 0.330 98 Paved parking 1.090 61 >75% Grass cover, Good, HSG B 1.420 70 Weighted Average 1.090 76.76% Pervious Area 0.330 23.24% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 1S: Post AA to POA1 Hydrograph ❑ Runoff Type II 24-hr 1 YR Rainfall=3.04" Runoff Area=1.420 ac Runoff Volume=0.087 of u Runoff Depth>0.74" LL I Tc=6.0 min I I ill CN=70 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Post Type 11 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 5S: Post-3 to POM Runoff = 2.49 cfs @ 11.99 hrs, Volume= 0.128 af, Depth> 0.65" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1 YR Rainfall=3.04" Area (ac) CN Description 0.860 98 Paved parking, HSG A 0.710 39 >75% Grass cover, Good, HSG A 0.810 61 >75% Grass cover, Good, HSG B 2.380 68 Weighted Average 1.520 63.87% Pervious Area 0.860 36.13% Impervious Area Tc Length Capacity Description 6.0 Direct Entry, Subcatchment 5S: Post-3 to POM Hydrograph ❑ Runoff Type II 24-hr 1 YR Rainfall=3.04" 21 1 II 1 Runoff Area=2.380 ac Runoff Volume=0.128 of Runoff Depth>0.65" LL Tc=6.0 min 'I I I1 A CN=68 9 1 2 3 4 5 6 7 8 9 19 11 12 13 14 15 16 17 18 19 29 21 22 23 24 Time (hours) Post Type 11 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 6S: Post -2 to POM Runoff = 0.69 cfs @ 11.97 hrs, Volume= 0.034 af, Depth> 1.85" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1 YR Rainfall=3.04" Area (ac) CN Description 0.050 98 Paved parking 0.120 80 >75% Grass cover, Good, HSG D 0.050 96 Gravel surface, HSG D 0.220 88 Weighted Average 0.170 77.27% Pervious Area 0.050 22.73% Impervious Area Tc Length m 0.1 0. Capacity Description Direct Entry, Subcatchment 6S: Post -2 to POM Hydrograph I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I II I I I I I I I I I I I I I I ---------------- I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 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 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 I I I I I I I I I I I ype- I W2Q=hr I I I I I I I I I I I I I I I I RUn-6fPAte&0 22Q alp_ Runoff Volume=0.034 of Runoff Depth>135"- TctU _ihilh_ ------------- I I I I I �+I I I _I `� N A8- I I I I I I I I I I I I I I I I I 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ❑ Runoff Post Type 11 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 7S: Post-6 Runoff = 0.38 cfs @ 11.97 hrs, Volume= 0.018 af, Depth> 1.48" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1 YR Rainfall=3.04" Area (ac) CN Description 0.070 98 Paved parking 0.020 39 >75% Grass cover, Good, HSG A 0.060 80 >75% Grass cover, Good, HSG D 0.150 83 Weighted Average 0.080 53.33% Pervious Area 0.070 46.67% Impervious Area Tc Length Capacity Description 6.0 Direct Entry, Subcatchment 7S: Post-6 Hydrograph -------------------- I I --- }T rrI}yTr I TT7y��pQ H24-hr0.38 - 0.36 II____I_I___r II I --r ,__T__r__I _ 0.34 I I I l I I I I I l I l l l l I I I 1 YRRainfall=;&04"'- 0.32 '_-L--L--I-- Runoff Area="50altr 0.26 ----------I--------'ll--�I--;--;- 0.24 'I I�OijoiflDejith>1 48"- — 0.2z _I------- ----I--- 0 0.2 - I I I I I I I I I I I I I I I I I I I I I I TyT�.OI 0.16 _I___I__1__T__r__ N /� '�L-8 _ 0.14_ , T_ I_ l__,__r__r__i __I_ ,__r__r__i _ 0.12 I I I I I I I I I I I I I I I I I I I I I I 0.08 _I _I _J _1 _4 _L _I _J _A _1 0.06 004 'I -I -I -, -T -r -I -I -, -1 -T 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ❑ Runoff Post Type 11 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 8S: Post -5 to POM Runoff = 9.11 cfs @ 11.96 hrs, Volume= 0.466 af, Depth> 2.29" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1 YR Rainfall=3.04" Area (ac) CN Description 1.870 98 Paved parking 0.020 39 >75% Grass cover, Good, HSG A 0.010 61 >75% Grass cover, Good, HSG B 0.540 80 >75% Grass cover, Good, HSG D 2.440 93 Weighted Average 0.570 23.36% Pervious Area 1.870 76.64% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 8S: Post -5 to POM Hydrograph I I I I 10 I I I I J- 9.11 cfa __J__L__L__L__I, I I I I I I I I I I I I I I 9 ' Type II 24-hr I I I I I I 1 1 1 1 I I I I I 8 1 YR Rainfall=3.04" I I I I I ---"--"--'--'--' Runoff Area=2.440 ac I I I I I -- Runoff Volume=0.466 of 5 Runoff Depth>2.29" 6 I I I I I I 3 I I I I I I I I I I I I I -_-------- I__1__L__L__I_____ T Tz=6.0 min LL I I I I I I I I I I I I 4 CN=93 I I I I I I 1 1 1 1 1 1 1 3 I 2 ' I I I I I I I I I I 11 12 13 Time (hours) ❑ Runoff Post Type 11 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 9S: Post-4 to POM Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1 YR Rainfall=3.04" Area (ac) CN Description 0.190 96 Gravel surface, HSG D 2.340 30 Woods, Good, HSG A 0.070 77 Woods, Good, HSG D 0.130 39 >75% Grass cover, Good, HSG A 0.140 80 >75% Grass cover, Good, HSG D 2.870 38 Weighted Average 2.870 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.5 100 0.1200 0.26 Sheet Flow, Grass: Dense n= 0.240 P2= 3.70" 2.1 263 0.1800 2.12 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 0.3 140 0.0570 7.43 44.57 TrapNee/Rect Channel Flow, Bot.W=5.00' D=1.00' Z= 1.0'/' Top.W=7.00' n= 0.040 Windinq stream, pools & shoals 8.9 503 Total Subcatchment 9S: Post-4 to POM Hydrograph ❑ Runoff Type II 24-hr 1 YR Rainfall=3.04" Runoff Area=2.870 ac Runoff Volume=0.000 of Runoff Depth=0.00" Flow Length=503' Tc=8.9 min CN=38 9 1 2 3 4 5 6 7 8 9 19 11 12 13 14 15 16 17 18 19 29 21 22 23 24 Time (hours) Post Type 11 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 10S: Post -1 B to POM Runoff = 6.70 cfs @ 11.97 hrs, Volume= 0.333 af, Depth> 2.02" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1 YR Rainfall=3.04" Area (ac) CN Description 1.640 98 Paved parking 0.230 39 >75% Grass cover, Good, HSG A 0.110 80 >75% Grass cover, Good, HSG D 1.980 90 Weighted Average 0.340 17.17% Pervious Area 1.640 82.83% Impervious Area Tc Length Capacity Description Direct Entry, Subcatchment 10S: Post -1 B to POM Hydrograph ❑ Runoff 2 I I I I G I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I ----------- i I I I I I I I I I I I I I I I I I I I I I I I I I I I Type II 24-hr 1 YR Rainfall�3." 04 Runoff Area=1.98&ad- I I I I I Rongff',V910me='1'10.$3$ elf_Y _Y _I u_7 _Y _I _I noff Depth>2.02' ------- Tc=6.0 min QN=90 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 0 9 1 2 3 4 5 6 7 8 9 19 11 12 13 14 15 16 17 18 19 29 21 22 23 24 Time (hours) Post Type 11 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 11S: Post AC to POM Runoff = 0.05 cfs @ 12.07 hrs, Volume= 0.018 af, Depth> 0.14" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1 YR Rainfall=3.04" Area (ac) CN Description 0.190 98 Paved parking 1.010 39 >75% Grass cover, Good, HSG A 0.300 61 >75% Grass cover, Good, HSG B 0.050 80 >75% Grass cover, Good, HSG D 1.550 52 Weighted Average 1.360 87.74% Pervious Area 0.190 12.26% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 11S: Post -1C to POM Hydrograph 0.055 ■Runoff a.a5Type'll `24-hi o.o45 1 YR Rainfall=3.04" o.o4 Runoff Area=1.550'ad o.os5 Runoff Volume=0.018 a.as Runoff Depthy0.14" 0a.a25 Tc=6.0 min li. 0.02 CN=52 a.aa5 Time (hours) Post Type 11 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Group Printed 2/4/2021 Summary for Pond 5P: SWM2 Inflow Area = 4.640 ac, 76.72% Impervious, Inflow Depth > 2.15" for 1 YR event Inflow = 16.50 cfs @ 11.97 hrs, Volume= 0.833 of Outflow = 10.97 cfs @ 12.04 hrs, Volume= 0.832 af, Atten= 34%, Lag= 4.6 min Primary = 10.97 cfs @ 12.04 hrs, Volume= 0.832 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 553.07' @ 12.04 hrs Surf.Area= 0.033 ac Storage= 0.106 of Plug -Flow detention time= 4.8 min calculated for 0.830 of (100% of inflow) Center -of -Mass det. time= 3.9 min ( 801.3 - 797.4 ) Volume Invert Avail.Storage Storage Description #1 549.00' 0.208 of 96.0" Round Pipe Storage L= 180.0' Device Routing Invert Outlet Devices #1 Primary 549.00' 24.0" Round Culvert L= 59.0' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 549.00' / 547.23' S= 0.0300 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 3.14 sf #2 Device 1 549.00' 15.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 553.10' 20.0" Vert. Orifice/Grate C= 0.600 #4 Device 1 556.00' 8.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=10.90 cfs @ 12.04 hrs HW=553.03' (Free Discharge) L1=Culvert (Passes 10.90 cfs of 20.78 cfs potential flow) 2=Orifice/Grate (Orifice Controls 10.90 cfs @ 8.88 fps) 3=Orifice/Grate ( Controls 0.00 cfs) =Sharp -Crested Rectangular Weir( Controls 0.00 cfs) Post 17 16 15 14 13 12 11 u 16 9 O ri 6 7 Timmons Pond 5P: SWM2 Hydrograph Type/1 24-hr 1 YR Rainfall=3.04" Printed 2/4/2021 ----,--T--r--r----,--r--r-,--,--Y--r--r -,-- T--r----,--T-- r-- r --I-- - --- ----7--r--r- i-- --- r- --- -- -- r--1r- i__�__7--r--1r- -- 18.50 dB AM 1gwTA-e��4,764Q1a�- -------------- Xn 1 1 1 1 1 1 1 1 1 1 I I 1 1 I I 1 1 1 1 1 1 1 1 1 1 1 1 --1r--1--Stbr'ace=0;.4G6raf- 1 1 1 109� Is c 1 1 1 1 —r I I I I I I I I I I I I I I I I I I I _r I I I _� I I I I __r__1 _Y _r _1 I I I I 1 1 I I 1 1 y__ I I I I I 1 1 I I I 1 _ r__I__y__7__r__1__y__7__Y__Y__1__ 1 1 I I I I I I I 1 I I I I I I I I I 1 1 1 I I I I I I I _y I 1 I I I I I I I I I I _F I 1 I I I I I I I 1 _y I I I I I I I I I I I 1 _r I 1 1 I I I _y I I I I I I I I I I 1 _F I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 4 5 Time (hours) ■ Inflow ■ Primary Post Timmons Type 11 24-hr 1 YR Rainfall=3.04" Summary for Pond 7P: SWM1 Printed 2/4/2021 Inflow Area = 1.420 ac, 23.24% Impervious, Inflow Depth > 0.74" for 1 YR event Inflow = 1.74 cfs @ 11.99 hrs, Volume= 0.087 of Outflow = 1.35 cfs @ 12.05 hrs, Volume= 0.087 af, Atten= 22%, Lag= 3.7 min Primary = 1.35 cfs @ 12.05 hrs, Volume= 0.087 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 547.73' @ 12.04 hrs Surf.Area= 0.006 ac Storage= 0.008 of Plug -Flow detention time= 2.9 min calculated for 0.087 of (100% of inflow) Center -of -Mass det. time= 2.2 min ( 877.9 - 875.7 ) Volume Invert Avail.Storage Storage Description #1 546.00' 0.019 of 48.0" Round Pipe Storage L= 65.0' Device Routing Invert Outlet Devices #1 Primary 546.00' 15.0" Round Culvert L= 42.5' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 546.00' / 541.75' S= 0.1000 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.23 sf #2 Device 1 546.00' 6.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 547.50' 11.0" Vert. Orifice/Grate C= 0.600 #4 Device 1 549.50' 4.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=1.33 cfs @ 12.05 hrs HW=547.71' (Free Discharge) L1=Culvert (Passes 1.33 cfs of 4.87 cfs potential flow) 2=Orifice/Grate (Orifice Controls 1.14 cfs @ 5.83 fps) 3=Orifice/Grate (Orifice Controls 0.19 cfs @ 1.58 fps) =Sharp -Crested Rectangular Weir( Controls 0.00 cfs) Post Type/1 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Grow Printed 2/4/2021 4 5 6 7 Pond 7P: SWM7 Hydrograph 0 11 12 13 Time (hours) nflow',Are0l .,420 ', ac P�a'�k F-l;e�=¢47.73' Storage=0; 008 of ■ Inflow S Primary Post Type 11 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Group Printed 2/4/2021 LJ...1—. GI'1 4n nn nn ..,.. nOCCO /l nA4� LJ...1—. GI'1 O..N..,..... O.J. d:...... !` rl--- .I! Summary for Link 4L: POM Inflow Area = 12.860 ac, 38.41 % Impervious, Inflow Depth > 0.99" for 1 YR event Inflow = 14.38 cfs @ 12.02 hrs, Volume= 1.064 of Primary = 14.38 cfs @ 12.02 hrs, Volume= 1.064 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs "I .I Inflow Area=12. 13 12 __r_i__i__r I I I I 11 I I I 8 I I 0 LL ] I I 6- 3- 2- Link 4L: POM Hydrograph Time (hours) 0 Primary I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I__ ___I__I__ I___I__ __ I _ _ J I I I I I I I I I I I I I I I I I I I I I I I I I I I I I IL I I I I L_J__J__1__L__L_J__ I I I I I I I Post Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 2/4/2021 HydroCAD® 10.00-20 s/n 08663 ©2017 HydroCAD Software Solutions LLC Page 20 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment1S: Post -1Ato POA1 Runoff Area=1.420 ac 23.24% Impervious Runoff Depth>1.12" Tc=6.0 min CN=70 Runoff=2.73 cfs 0.132 of Subcatchment5S: Post-3 to POA1 Runoff Area=2.380 ac 36.13% Impervious Runoff Depth>1.01" Tc=6.0 min CN=68 Runoff=4.06 cfs 0.200 of Subcatchment6S: Post -2 to POA1 Runoff Area=0.220 ac 22.73% Impervious Runoff Depth>2.43" Tc=6.0 min CN=88 Runoff=0.90 cfs 0.045 of Subcatchment7S: Post-6 Runoff Area=0.150 ac 46.67% Impervious Runoff Depth >2.01" Tc=6.0 min CN=83 Runoff=0.52 cfs 0.025 of Subcatchment8S: Post -5 to POA1 Runoff Area=2.440 ac 76.64% Impervious Runoff Depth >2.91" Tc=6.0 min CN=93 Runoff=11.39 cfs 0.591 of Subcatchment9S: Post-4to POA1 Runoff Area=2.870 ac 0.00% Impervious Runoff Depth>0.01" Flow Length=503' Tc=8.9 min CN=38 Runoff=0.01 cfs 0.002 of Subcatchment10S: Post -1 B to POA1 Runoff Area=1.980 ac 82.83% Impervious Runoff Depth >2.61" Tc=6.0 min CN=90 Runoff=8.56 cfs 0.431 of Subcatchment11 S: Post -1 C to POA1 Runoff Area=1.550 ac 12.26% Impervious Runoff Depth>0.30" Tc=6.0 min CN=52 Runoff=0.42 cfs 0.039 of Pond 5P: SWM2 Peak Elev=553.99' Storage=0.136 of Inflow=20.85 cfs 1.067 of Outflow=16.02 cfs 1.066 of Pond 7P: SWM1 Peak Elev=548.16' Storage=0.010 of Inflow=2.73 cfs 0.132 of Outflow=2.69 cfs 0.132 of Link 4L: POA1 Inflow=22.63 cfs 1.439 of Primary=22.63 cfs 1.439 of Total Runoff Area = 13.010 ac Runoff Volume = 1.466 of Average Runoff Depth = 1.35" 61.49% Pervious = 8.000 ac 38.51% Impervious = 5.010 ac Post Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 1S: Post AA to POA1 Runoff = 2.73 cfs @ 11.98 hrs, Volume= 0.132 af, Depth> 1.12" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2 YR Rainfall=3.68" Area (ac) CN Description 0.330 98 Paved parking 1.090 61 >75% Grass cover, Good, HSG B 1.420 70 Weighted Average 1.090 76.76% Pervious Area 0.330 23.24% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, 3 2 i Subcatchment 1S: Post AA to POA1 Hydrograph Type II 24-hr 2 YR Rainfall=3.68" Runoff Area=1.420 ac Runoff Volume=0.132 of Runoff Depth>1.12" Tc=6.0 min CN=70 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ❑ Runoff Post Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 5S: Post-3 to POM Runoff = 4.06 cfs @ 11.98 hrs, Volume= 0.200 af, Depth> 1.01" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2 YR Rainfall=3.68" Area (ac) CN Description 0.860 98 Paved parking, HSG A 0.710 39 >75% Grass cover, Good, HSG A 0.810 61 >75% Grass cover, Good, HSG B 2.380 68 Weighted Average 1.520 63.87% Pervious Area 0.860 36.13% Impervious Area Tc Length Capacity Description t-f..x 6.0 Direct Entry, Subcatchment 5S: Post-3 to POM Hydrograph I I I I I I I I I I I I I I I 4 66 c(s 4 Type II 24-hr I I 2 YR Rainfall=3.68" Runoff Area=2.380 ac 3 Runoff Volume=0.200 of Runoff Depth>1.01" F 2 Tc=6.0 min CN=68 9 1 2 3 4 5 6 7 8 9 19 11 12 13 14 15 16 17 18 19 29 21 22 23 24 Time (hours) ❑ Runoff Post Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 6S: Post -2 to POM Runoff = 0.90 cfs @ 11.97 hrs, Volume= 0.045 af, Depth> 2.43" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2 YR Rainfall=3.68" Area (ac) CN Description 0.050 98 Paved parking 0.120 80 >75% Grass cover, Good, HSG D 0.050 96 Gravel surface, HSG D 0.220 88 Weighted Average 0.170 77.27% Pervious Area 0.050 22.73% Impervious Area Tc Length Capacity Description 6.0 Direct Entry, 1 Subcatchment 6S: Post -2 to POM Hydrograph Type II 24-hr 2 YR Rainfall=3.68" Runoff Area=0.220 ac Runoff Volume=0.045 of I� Runoff Depth>2.43" Tc=6.0 min 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ❑ Runoff Post Timmons Type 11 24-hr 2 YR Rainfall=3.68" Summary for Subcatchment 7S: Post-6 Runoff = 0.52 cfs @ 11.97 hrs, Volume= 0.025 af, Depth> 2.01" Printed 2/4/2021 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2 YR Rainfall=3.68" Area (ac) CN Description 0.070 98 Paved parking 0.020 39 >75% Grass cover, Good, HSG A 0.060 80 >75% Grass cover, Good, HSG D 0.150 83 Weighted Average 0.080 53.33% Pervious Area 0.070 46.67% Impervious Area Tc Length Capacity Description 6.0 Direct Entry, Subcatchment 7S: Post-6 Hydrograph 0.55 052 cfa 0.5 7Ype 11,24-hr 0.45 'I 2 YR Rainfall=;3.68" F F , 1--RdnbffrAfeA=1Y. 1r5Q alp 04 0.35 ungff VgfLimj�=;O.0 i i i i i i i w-------- Runoff Depth>X(Yii r r 1�c-6.0 t�1 n v. 0.25 i i i i i i i i i 0.2 Q#W-83 1 i 0.15 0.1 0.05 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ❑ Runoff Post Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 8S: Post -5 to POM Runoff = 11.39 cfs @ 11.96 hrs, Volume= 0.591 af, Depth> 2.91" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2 YR Rainfall=3.68" Area (ac) CN Description 1.870 98 Paved parking 0.020 39 >75% Grass cover, Good, HSG A 0.010 61 >75% Grass cover, Good, HSG B 0.540 80 >75% Grass cover, Good, HSG D 2.440 93 Weighted Average 0.570 23.36% Pervious Area 1.870 76.64% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 8S: Post -5 to POM Hydrograph I I I I ____�__�__�__'__`--+--�--'---'--"--'--'--. �__ ■Runoff 12 n as cra Type yp Il 24-h r II 10 2 YR Rainfall=3.68" I I s Minthff OrPa=2ddn air_ ----I--J--J--J--L--L-- ___I__J__J__1__ L__ L- N I I I I I I V ] I I I I I I 3 0 6 LL 5 I I I I I I I I q I I I I I I I I I I I R4npjfILVQI m;e_=J10.$91 a Aunoff- Dip6>2.91_ i" I I I I I I I I I I I I I I I - I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I ____________________ I I I I I I I I I I I I I I I I i I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 11 12 13 Time (hours) Post Timmons Type 11 24-hr 2 YR Rainfall=3.68" Summary for Subcatchment 9S: Post-4 to POM Runoff = 0.01 cfs @ 24.00 hrs, Volume= 0.002 af, Depth> 0.01" Printed 2/4/2021 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2 YR Rainfall=3.68" Area (ac) CN Description 0.190 96 Gravel surface, HSG D 2.340 30 Woods, Good, HSG A 0.070 77 Woods, Good, HSG D 0.130 39 >75% Grass cover, Good, HSG A 0.140 80 >75% Grass cover, Good, HSG D 2.870 38 Weighted Average 2.870 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.5 100 0.1200 0.26 Sheet Flow, Grass: Dense n= 0.240 P2= 3.70" 2.1 263 0.1800 2.12 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 0.3 140 0.0570 7.43 44.57 TrapNee/Rect Channel Flow, Bot.W=5.00' D=1.00' Z= 1.0'/' Top.W=7.00' n= 0.040 Windinq stream, pools & shoals 8.9 503 Total Subcatchment 9S: Post-4 to POM Hydrograph I L__ ■ RunoR 0.006KII om 0.005 Typelll 4ihr rL_J__J__ __1__0.005 2 YR Rainfall=3.680.004 Runoff Area=2.870 ac - _J__1__1__0.004 Runoff Volume=0.Q02ofj9.993 Runoff Depth>0.01----II-- --III --pFlow Len th=503'___I____99.992 Tc=8.9min 1 1 11 � 1 1 10.002 CN=38 -_11 1 1 1I I 1I I I I-----------------0.001 11 � 1 1 10.001 0.000 I I 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Post Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 10S: Post -1 B to POM Runoff = 8.56 cfs @ 11.97 hrs, Volume= 0.431 af, Depth> 2.61" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2 YR Rainfall=3.68" Area (ac) CN Description 1.640 98 Paved parking 0.230 39 >75% Grass cover, Good, HSG A 0.110 80 >75% Grass cover, Good, HSG D 1.980 90 Weighted Average 0.340 17.17% Pervious Area 1.640 82.83% Impervious Area Tc Length Capacity Description Direct Entry, Subcatchment 10S: Post -1 B to POM Hydrograph I Type II 24-hr 8- 2 YR Rainfall=3.68" I I I I I I I Runoff Area=1.980 ac 6 - III III III III Runoff Volume=0.431 of I I I " V 5 J L Runoff Depth>2.61" I I I I I I I I I I I I I I 3 I I I I I I I LL Tc=6.0 min Q I I I I I I I I I I I CN=90 3 I I I I I I I I I I I I I I I I I I I I I I F I I 2 I I I I I I I I I 1 I I I I I I I 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ❑ Runoff Post Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 11S: Post AC to POM Runoff = 0.42 cfs @ 12.02 hrs, Volume= 0.039 af, Depth> 0.30" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2 YR Rainfall=3.68" Area (ac) CN Description 0.190 98 Paved parking 1.010 39 >75% Grass cover, Good, HSG A 0.300 61 >75% Grass cover, Good, HSG B 0.050 80 >75% Grass cover, Good, HSG D 1.550 52 Weighted Average 1.360 87.74% Pervious Area 0.190 12.26% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 11S: Post -1C to POM Hydrograph ,I 0.46 I I - I I I I I -I 0.44 1 r_r_I _,_,_T 0 --1 T T -r -I T 0.42 __I__ _ _T1 0.4 yp7 I 0.36 2 YR Rainfal�l__3 6>3, I 1 1 1 I 1 1 1 11 0.34 L Iy� =--=-- L--11---- ----i--11-- 1 1 1 I 1 1 1 0.32 Ruhoff Arda=t1L550'a --11� --111----'--`----1-----'--'-- --1-- 1 1 1 1 1 1 0.32 '' _-I--I--T--T--r-r--r-T--,--T--r --1--,--T--T--r--r--I--,--T--T--1__ 0.3 FtundffYg1u0w=JII3 I wV Ftunofb-epth>Q* ---r- T-rrI ,-T-T 0.24 ____-------1---1 _1 --i -- 3 0.22 Tc=6.0 m_ ifs -I - LL 02 1 -I -I -1 -r -r -I 0.18 -----1---1--J----- -512- 1 1 1 1 1 1 1 1 0.16 T 'I 0.14 0.12 I I I I I I I I I i 0.1 ,'I _I __I _, _T__r _r _I _, _i__T T__I _I __I__,__T__T _I 0.06004 ------J--1--L--L----J--J--1- -I _--------I--I --I-- il Time (horns) ■ Runoff Post Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 2/4/2021 Summary for Pond 5P: SWM2 Inflow Area = 4.640 ac, 76.72% Impervious, Inflow Depth > 2.76" for 2 YR event Inflow = 20.85 cfs @ 11.96 hrs, Volume= 1.067 of Outflow = 16.02 cfs @ 12.03 hrs, Volume= 1.066 af, Atten= 23%, Lag= 3.9 min Primary = 16.02 cfs @ 12.03 hrs, Volume= 1.066 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 553.99' @ 12.03 hrs Surf.Area= 0.032 ac Storage= 0.136 of Plug -Flow detention time= 4.8 min calculated for 1.063 of (100% of inflow) Center -of -Mass det. time= 4.0 min ( 794.6 - 790.5 ) Volume Invert Avail.Storage Storage Description #1 549.00' 0.208 of 96.0" Round Pipe Storage L= 180.0' Device Routing Invert Outlet Devices #1 Primary 549.00' 24.0" Round Culvert L= 59.0' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 549.00' / 547.23' S= 0.0300 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 3.14 sf #2 Device 1 549.00' 15.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 553.10' 20.0" Vert. Orifice/Grate C= 0.600 #4 Device 1 556.00' 8.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=15.50 cfs @ 12.03 hrs HW=553.92' (Free Discharge) L1=Culvert (Passes 15.50 cfs of 23.63 cfs potential flow) 2=Orifice/Grate (Orifice Controls 12.24 cfs @ 9.97 fps) 3=Orifice/Grate (Orifice Controls 3.26 cfs @ 3.07 fps) =Sharp -Crested Rectangular Weir( Controls 0.00 cfs) Post Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Grow Printed 2/4/2021 Pond 5P: SWM2 Hydrograph I I I I I I I I I I I -I -y -+ -r -I -I -y -r -I -� -" I I I I I I I I I I I I -Y -r -1 -y -♦ -r -I --I -+ -r -r -I ■Inflow 23 20.e5J- 0Primary 22 -- 4 --; - - - - 21 - ------Ti,-Ti tnfl vwIa 4V-� 20 -J _1 _L18 17 ----'--4-- --1----'--�--- ors 1 --+----�S r � T I� a 16 , ' , -I --, -7 -I -I -, -T , __ -� -i ,- , , I I I I 14 ,' , , - I -y -T -r -I -I -y -r -I -1 -r -I -7 -T -r -I -y -T 13 ' __ ______I-� --I---- --1--I_ - ---� --1--- 12 I u. 10 9 I 1 1 I 1 1 1 _ r__I__y__T__r__I__-I__T__r__r__I__ ' _ i_ 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 6 ' , ,, - I__,__7__r__r__I__,__r__r__I_ --r--r-,--r- r__I___I__1__r__r__I__ _J _1 _L I 1 4 ,' , , -I -1 -i -r -I -I -t -Y -I -1 -r -I -7 -T -r -I -Y -i -r -r l 3 1 1 1 1 1 1 1 1 1 1 4 5 6 7 8 9 10 11 12 13 Time (hours) Post Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 2/4/2021 Summary for Pond 7P: SWM1 Inflow Area = 1.420 ac, 23.24% Impervious, Inflow Depth > 1.12" for 2 YR event Inflow = 2.73 cfs @ 11.98 hrs, Volume= 0.132 of Outflow = 2.69 cfs @ 12.01 hrs, Volume= 0.132 af, Atten= 1%, Lag= 1.7 min Primary = 2.69 cfs @ 12.01 hrs, Volume= 0.132 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 548.16' @ 12.01 hrs Surf.Area= 0.006 ac Storage= 0.010 of Plug -Flow detention time= 2.8 min calculated for 0.132 of (100% of inflow) Center -of -Mass det. time= 2.1 min ( 863.8 - 861.7 ) Volume Invert Avail.Storage Storage Description #1 546.00' 0.019 of 48.0" Round Pipe Storage L= 65.0' Device Routing Invert Outlet Devices #1 Primary 546.00' 15.0" Round Culvert L= 42.5' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 546.00' / 541.75' S= 0.1000 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.23 sf #2 Device 1 546.00' 6.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 547.50' 11.0" Vert. Orifice/Grate C= 0.600 #4 Device 1 549.50' 4.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=2.57 cfs @ 12.01 hrs HW=548.12' (Free Discharge) L1=Culvert (Passes 2.57 cfs of 5.71 cfs potential flow) 2=Orifice/Grate (Orifice Controls 1.29 cfs @ 6.59 fps) 3=Orifice/Grate (Orifice Controls 1.28 cfs @ 2.69 fps) =Sharp -Crested Rectangular Weir( Controls 0.00 cfs) Post Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Grow Printed 2/4/2021 Pond 7P: SWM7 Hydrograph I I I I I I I I I I I ----------------------------------------------------------------- II I II II II I II II II I II II II � II II I I I ■ Inflow 3 273 ch ■ Primary 2690fnfloinrllAre0l.1420'llac POAk IFWv=¢48.16' ----- --Stbr ge*-OFG 0 of 2 � II II II II II II cI li II II II II LL I I I I I I I I 4 5 6 7 3 9 10 11 12 13 Time (hours) Post Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 2/4/2021 Summary for Link 4L: POM Inflow Area = 12.860 ac, 38.41 % Impervious, Inflow Depth > 1.34" for 2 YR event Inflow = 22.63 cfs @ 12.02 hrs, Volume= 1.439 of Primary = 22.63 cfs @ 12.02 hrs, Volume= 1.439 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 4L: POM Hydrograph 221,,.� V222 A-rLLrLLLFrIIII11II lo-__-____w-111Y111y =-y1J1112-____ ea-_JJJJJ_IIIIIII n-______- f-yJJYJJJ�I IIIIIIII1 21 2 - -yJ-JJJ�tIII -fLLLLyr.86III111III 1_L -7 -Y -T -r - -I -y -r -I - 4 ___ -I -I -Y -Y -I - g1 I;__6 __r__I__r____r__ 4 ------- -- - - -I- Time (hours) ------1----Ir--- ■Inflow --I`----�I----I`----------I�--'-- ■Primary I I I I __I_ - _I I I I I - I I I I I I I I I I I J__ 1__ L_J__J__ 1__ L__I__J__ I I -I _ r _1 _y _7 _r _I _y _Y _r _r _I I I _r _1 _y _7 _r _I _y _7 _r _r _I I I I I _L__I__ J__ 1__ L__I__ J__1__L__ L_J___ 1 1 1 I I 1 I I I I I I Post Type II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 2/4/2021 HydroCAD® 10.00-20 s/n 08663 ©2017 HydroCAD Software Solutions LLC Page 34 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method SubcatchmentlS: Post -1Ato POA1 Runoff Area=1.420 ac 23.24% Impervious Runoff Depth>2.47" Tc=6.0 min CN=70 Runoff=6.05 cfs 0.292 of Subcatchment5S: Post-3 to POA1 Runoff Area=2.380 ac 36.13% Impervious Runoff Depth>2.29" Tc=6.0 min CN=68 Runoff=9.52 cfs 0.455 of Subcatchment6S: Post -2 to POA1 Runoff Area=0.220 ac 22.73% Impervious Runoff Depth >4.21" Tc=6.0 min CN=88 Runoff=1.51 cfs 0.077 of Subcatchment7S: Post-6 Runoff Area=0.150 ac 46.67% Impervious Runoff Depth>3.69" Tc=6.0 min CN=83 Runoff=0.93 cfs 0.046 of Subcatchment8S: Post -5 to POA1 Runoff Area=2.440 ac 76.64% Impervious Runoff Depth>4.75" Tc=6.0 min CN=93 Runoff=18.04 cfs 0.967 of Subcatchment9S: Post-4to POA1 Runoff Area=2.870 ac 0.00% Impervious Runoff Depth>0.28" Flow Length=503' Tc=8.9 min CN=38 Runoff=0.24 cfs 0.068 of Subcatchmentl OS: Post -1 B to POA1 Runoff Area=1.980 ac 82.83% Impervious Runoff Depth>4.42" Tc=6.0 min CN=90 Runoff=14.04 cfs 0.730 of Subcatchmentl1S: Post-1C to POA1 Runoff Area=1.550 ac 12.26% Impervious Runoff Depth>1.07" Tc=6.0 min CN=52 Runoff=2.61 cfs 0.138 of Pond 5P: SWM2 Peak Elev=555.98' Storage=0.192 of Inflow=33.59 cfs 1.774 of Outflow=29.25 cfs 1.772 of Pond 7P: SWM1 Peak Elev=549.52' Storage=0.017 of Inflow=6.05 cfs 0.292 of Outflow=5.74 cfs 0.291 of Link 4L: POA1 Inflow=46.77 cfs 2.724 of Primary=46.77 cfs 2.724 of Total Runoff Area = 13.010 ac Runoff Volume = 2.772 of Average Runoff Depth = 2.56" 61.49% Pervious = 8.000 ac 38.51% Impervious = 5.010 ac Post Type II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 1S: Post AA to POA1 Runoff = 6.05 cfs @ 11.97 hrs, Volume= 0.292 af, Depth> 2.47" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10 YR Rainfall=5.57" Area (ac) CN Description 0.330 98 Paved parking 1.090 61 >75% Grass cover, Good, HSG B 1.420 70 Weighted Average 1.090 76.76% Pervious Area 0.330 23.24% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 1S: Post AA to POA1 Hydrograph I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I i I I I I I I I I I I I I I I I I --,--1--r-- I I I I I I I I I I I I I I I I I I -----I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I Type II 24-hr 10 YR Rainfall=5.57" Runoff Area=1.420 ac Runoff Volume=0.292 of Runoff Depth>2.47" I_ I_ I_ I I I I Tc=6.0 min I I I I I I I I CN=70 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ❑ Runoff Post Type II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 5S: Post-3 to POM Runoff = 9.52 cfs @ 11.98 hrs, Volume= 0.455 af, Depth> 2.29" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10 YR Rainfall=5.57" Area (ac) CN Description 0.860 98 Paved parking, HSG A 0.710 39 >75% Grass cover, Good, HSG A 0.810 61 >75% Grass cover, Good, HSG B 2.380 68 Weighted Average 1.520 63.87% Pervious Area 0.860 36.13% Impervious Area Tc Length Capacity Description Direct Entry, Subcatchment 5S: Post-3 to POM Hydrograph ❑ Runoff I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 1 I I I I 1 1 1 I 1 I I I I 1 1 1 I 1 I I I I 1 1 1 I I I I I I I I I I I I I I I I I I I 1 I I I I 1 1 I I i 1 I I I I 1 1 I I I 1 1 1 I I I I 1 1 I I I 1 I I I I 1 1 I I I 1 I I I I 1 1 I I 1 I I I I 1 1 I I 1 I I I I 1 1 I I I I I I I I I I I I I I I I I I I I I I Type II 24-hr 10 YR Rainfall=5.57rr Runoff Area=2.380 ac Runoff Volume=0.455 of --,--III--Runoff Depth>2.29" I I Tc=6.0 min I I I I I I I I I I I CN=68 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I--I--Y--4--�--h--h-- I I I I I I I I I I I I 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Time (hours) Post Type II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 6S: Post -2 to POM Runoff = 1.51 cfs @ 11.96 hrs, Volume= 0.077 af, Depth> 4.21" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10 YR Rainfall=5.57" Area (ac) CN Description 0.050 98 Paved parking 0.120 80 >75% Grass cover, Good, HSG D 0.050 96 Gravel surface, HSG D 0.220 88 Weighted Average 0.170 77.27% Pervious Area 0.050 22.73% Impervious Area Tc Length Capacity Description 6.0 Direct Entry, Subcatchment 6S: Post -2 to POM Hydrograph ❑ Runoff Type II 24-hr 10 YR Rainfall=5.57" Runoff Area=0.220 ac Runoff Volume=0.077 of Runoff Depth>4.21" Tc=6.0 min CN=88 9 1 2 3 4 5 6 7 8 9 19 11 12 13 14 15 16 17 18 19 29 21 22 23 24 Time (hours) Post Type II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 7S: Post-6 Runoff = 0.93 cfs @ 11.97 hrs, Volume= 0.046 af, Depth> 3.69" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10 YR Rainfall=5.57" Area (ac) CN Description 0.070 98 Paved parking 0.020 39 >75% Grass cover, Good, HSG A 0.060 80 >75% Grass cover, Good, HSG D 0.150 83 Weighted Average 0.080 53.33% Pervious Area 0.070 46.67% Impervious Area Tc Length Capacity Description 6.0 Direct Entry, Subcatchment 7S: Post-6 Hydrograph ❑ Runoff o sa ors Type II 24-hr 10 YR Rainfall=5.57" Runoff Area=0.150 ac Runoff Volume=0.046 of Runoff Depth>3.69" Tc=6.0 min CN=83 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Post Type 11 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Grow Printed 2/4/2021 Summary for Subcatchment 8S: Post -5 to POA1 Runoff = 18.04 cfs @ 11.96 hrs, Volume= 0.967 af, Depth> 4.75" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10 YR Rainfall=5.57" Area (ac) CN Descriotion " 1.870 98 Paved parking 0.020 39 >75% Grass cover, Good, HSG A 0.010 61 >75% Grass cover, Good, HSG B 0.540 80 >75% Grass cover, Good, HSG D 2.440 93 Weighted Average 0.570 23.36% Pervious Area 1.870 76.64% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 8S: Post -5 to POA1 Hydrograph 20 ____--+--+--+----��-+--'---'__+__+__+__+__+__+__�_�-----+__ ■Runoff 18 � 1 I I I I 1 1 I I I __----T--Y--*--Y--Y--Y-----I-- 1 I I I I 1 �p r�, __ --Y--Y--T-----'Tj/M`r-rr1- 17 J' � -I -T -7 -Y -r -� r -T -Y r Y -Y- Y Y 16. �yi�1t 57rr-- _ r _I _T _r _T _r _r _r _I i■ r -----,--,--T--; --;--Ir--I, --11 r l� nLifAFe=�.-4 - 13 1 1 1 1 1 1 1 1 1 1 __� __i __I__ i__ T_______ 1 1 � --1 - 1 1 RMnp I �i�e=8�"I-- ,2 __1___I_ I 1 1 1 1 I � 1 IL- 1 1 1 1 11 _!1_- unof-:Dep Fr>4.1 51 1 3 ,Q 1 _L__1, J__L__1__L__L__ i y u. 9 _I _J _J _, _L _L _L a I � 7 _I _I _J _J _1 _♦ _� _L _n _� _1 _L _L _I _I _J _J L I I I I I I I I I I I I I I I I 4 3 1 I I --r--r--1--T--r-r--r--r-r __I__. -r--r--r--r--1--- --- 2 - - -- __ r- r__r__r__--------T--r--r--r-- 11 12 13 Time (hours) Post Timmons Type II 24-hr 10 YR Rainfall=5.57" Summary for Subcatchment 9S: Post-4 to POM Runoff = 0.24 cfs @ 12.10 hrs, Volume= 0.068 af, Depth> 0.28" Printed 2/4/2021 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10 YR Rainfall=5.57" Area (ac) CN Description 0.190 96 Gravel surface, HSG D 2.340 30 Woods, Good, HSG A 0.070 77 Woods, Good, HSG D 0.130 39 >75% Grass cover, Good, HSG A 0.140 80 >75% Grass cover, Good, HSG D 2.870 38 Weighted Average 2.870 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.5 100 0.1200 0.26 Sheet Flow, Grass: Dense n= 0.240 P2= 3.70" 2.1 263 0.1800 2.12 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 0.3 140 0.0570 7.43 44.57 TrapNee/Rect Channel Flow, Bot.W=5.00' D=1.00' Z= 1.0'/' Top.W=7.00' n= 0.040 Windinq stream, pools & shoals 8.9 503 Total Subcatchment 9S: Post-4 to POM Hydrograph 0.26 o.za as 0.24 Type 11 241hr 0.22 10 YR Rainfall=5.57" 1 1 0.2 Runoff Area=2.870 ac-- F 0.18 Runoff Volume=0.068 a 0.16 " = 0.14 L Runoff Depth>0.28.r --- L _J _1 _1 _L _I _ _J _1 LL 0.12 Flow Len th=503 _J, 0.1 Tc=8.9 mid -' --*- 0.08 ' dW38- o.os 0.04 . -- ------ 0.02 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ❑ RunoH Post Type II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 10S: Post -1 B to POM Runoff = 14.04 cfs @ 11.96 hrs, Volume= 0.730 af, Depth> 4.42" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10 YR Rainfall=5.57" Area (ac) CN Description 1.640 98 Paved parking 0.230 39 >75% Grass cover, Good, HSG A 0.110 80 >75% Grass cover, Good, HSG D 1.980 90 Weighted Average 0.340 17.17% Pervious Area 1.640 82.83% Impervious Area Tc Length Capacity Description Direct Entry, Subcatchment 10S: Post -1 B to POM Hydrograph ____ _ 14; I --I_ I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I i I I I I I I I I I I --r-I--r--r--r--r--r--r--I�- _ I I I I I I I I I I I I I I I I I I I I --L--I--J--J--J--L--L--L--I---I-- J I I I I I I I I I I I I I I 7--r--r--r--r--r--I-- I I I I I I I I I I I I I I I I I I I I Type II 24-hr 110 YR RainfallT5.57" Rwnbf i Arett=1.980 al- ____r__r__r__r __I__�__'__r__r__r__ 1--T--kunafFDeptE 4.:t2*- _J _J Tc=6.0 tnih I I I I I I I I N I A I I I I I I I I I I I I I I I I I I I I ,--7--T--r--r-- I I I I I I I I I I I -1--1--L--L--L-_I__J--1--1--L--L-- I I I I I I I I I I I - l--r --r --r I I ,--l--r--r--r-- I I I I I I I I I I I I I I I I I I I I I 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 16 19 20 21 22 23 Time (hours) ❑ Runoff Post Type II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 11S: Post AC to POM Runoff = 2.61 cfs @ 11.99 hrs, Volume= 0.138 af, Depth> 1.07" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10 YR Rainfall=5.57" Area (ac) CN Description 0.190 98 Paved parking 1.010 39 >75% Grass cover, Good, HSG A 0.300 61 >75% Grass cover, Good, HSG B 0.050 80 >75% Grass cover, Good, HSG D 1.550 52 Weighted Average 1.360 87.74% Pervious Area 0.190 12.26% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 11S: Post -1C to POM Hydrograph ❑ Runoff Type II 24-hr 10 YR Rainfall=5.57" 2 Runoff Area=1.550 ac Runoff Volume=0.138 of 3 Runoff Depth>1.07" LL Tc=6.0 min CN=52 01234567891011121314 Time (houm) Post Type II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 2/4/2021 Summary for Pond 5P: SWM2 Inflow Area = 4.640 ac, 76.72% Impervious, Inflow Depth > 4.59" for 10 YR event Inflow = 33.59 cfs @ 11.96 hrs, Volume= 1.774 of Outflow = 29.25 cfs @ 12.01 hrs, Volume= 1.772 af, Atten= 13%, Lag= 2.7 min Primary = 29.25 cfs @ 12.01 hrs, Volume= 1.772 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 555.98' @ 12.01 hrs Surf.Area= 0.022 ac Storage= 0.192 of Plug -Flow detention time= 4.5 min calculated for 1.768 of (100% of inflow) Center -of -Mass det. time= 3.8 min ( 780.7 - 776.9 ) Volume Invert Avail.Storage Storage Description #1 549.00' 0.208 of 96.0" Round Pipe Storage L= 180.0' Device Routing Invert Outlet Devices #1 Primary 549.00' 24.0" Round Culvert L= 59.0' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 549.00' / 547.23' S= 0.0300 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 3.14 sf #2 Device 1 549.00' 15.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 553.10' 20.0" Vert. Orifice/Grate C= 0.600 #4 Device 1 556.00' 8.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=29.00 cfs @ 12.01 hrs HW=555.90' (Free Discharge) L1=Culvert (Inlet Controls 29.00 cfs @ 9.23 fps) 2=Orifice/Grate (Passes < 14.80 cfs potential flow) 3=Orifice/Grate (Passes < 14.72 cfs potential flow) =Sharp -Crested Rectangular Weir( Controls 0.00 cfs) Post Type 11 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Grow Printed 2/4/2021 Pond SP: SWM2 Hydrograph - - ---L-- L - -'-- '-L--L----J----L--L--'--J--1--L-----1--L--L--- I I 1 1 I I I 1 I I I 1 1 I I I 1 � Inflow _J__L__1__L__1__J__1__L__1__J__L__1__L__L__L_J__J__L__L__L_J_- Prima ry 36 I I I I 1 1 I I 1 1 33.59 da I I 1 1 I I 1 JL__L__1__J__L__L__ 1__J__L L__L L_J__J L L_J-- �^ ---;--.----J nfi1aW.Area� ,64QILa�_ '' ----.-- 32 , 1 1 _ __1__L__I__J__J__L__1__ �.f��yL 1�_'V--�II�.L 30 / ' 1 1 I 21 dB 1 I 1 p��1 iTy�aZK C •Vflv_i i' _ _J _1 _L _I _I _J _L _I _J _L _I L_J _J _L 28 , 1 1 1 1 1 1 1 1 1 1 1 1 1 1 - J--1L--; -Storage=fi.49Zaf_ 26 ; ; ; ; ; ,' ...........L _I 24 1 1 1 1 1 1 1 1 1 1 1 i' 22 ' 1 1 I I � _L _L_1 _L _L _I 20 i' _I _J _1 _L 18 16 14 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 12 10 6 6' --'- - - `---- --'- - `--'- a ,' 4 5 6 7 8 9 10 11 12 13 Time (hours) Post Timmons Type II 24-hr 10 YR Rainfall=5.57" Summary for Pond 7P: SWM1 Printed 2/4/2021 Inflow Area = 1.420 ac, 23.24% Impervious, Inflow Depth > 2.47" for 10 YR event Inflow = 6.05 cfs @ 11.97 hrs, Volume= 0.292 of Outflow = 5.74 cfs @ 12.00 hrs, Volume= 0.291 af, Atten= 5%, Lag= 1.5 min Primary = 5.74 cfs @ 12.00 hrs, Volume= 0.291 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 549.52' @ 12.00 hrs Surf.Area= 0.004 ac Storage= 0.017 of Plug -Flow detention time= 2.5 min calculated for 0.291 of (100% of inflow) Center -of -Mass det. time= 2.0 min ( 839.9 - 837.9 ) Volume Invert Avail.Storage Storage Description #1 546.00' 0.019 of 48.0" Round Pipe Storage L= 65.0' Device Routing Invert Outlet Devices #1 Primary 546.00' 15.0" Round Culvert L= 42.5' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 546.00' / 541.75' S= 0.1000 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.23 sf #2 Device 1 546.00' 6.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 547.50' 11.0" Vert. Orifice/Grate C= 0.600 #4 Device 1 549.50' 4.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=5.73 cfs @ 12.00 hrs HW=549.52' (Free Discharge) L1=Culvert (Passes 5.73 cfs of 7.94 cfs potential flow) 2=Orifice/Grate (Orifice Controls 1.71 cfs @ 8.71 fps) 3=Orifice/Grate (Orifice Controls 3.97 cfs @ 6.02 fps) =Sharp -Crested Rectangular Weir(Weir Controls 0.04 cfs @ 0.48 fps) Post Timmons Pond 7P: SWM7 Hydrograph I I I I I I I I I I I I I I I I I I I I I I I I I I I IIIIIIIIII ---------------------------- I IIIIIIIIII IIIIIIIIII IIIIIIIII I I I I I I I I I I I I I I i 4 5 11 12 13 Time (hours) Type 11 24-hr 10 YR Rainfall=5.57" Printed 2/4/2021 I I I I I I I i l l I I I I I I I I I I I ffiflow'IAre0l .1420',at --I, - bra Ie=O'.017 of I 11 III I I I I I I I I I I I I II I ___ _ I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I ■ Inflow ■ Primary Post Type II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 2/4/2021 HydroCAD® 10.00-20 s/n 08663 @ 2017 HydroCAD Software Solutions LLC Page 47 Summary for Link 4L: POM Inflow Area = 12.860 ac, 38.41 % Impervious, Inflow Depth > 2.54" for 10 YR event Inflow = 46.77 cfs @ 12.00 hrs, Volume= 2.724 of Primary = 46.77 cfs @ 12.00 hrs, Volume= 2.724 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 4L: POM Hydrograph ____--i--i --i --i-- j--i-Y____i--T--i --i---I--I-------I --i -i-- ■Inflow 5 ■ Primary ow re a 40 3 1 1 1 1 1 1 1 1 1 1 1 -r--r--r--�--r-r--r--r-�----r--�-r--r--r--r-�--r--r--r--r- 1 1 1 1 1 1 1 1 1 1 1 3 _J__J__J__L__�__J__J_ I__J__i__J__1__L_J__J__J__L__J_J__ � I I I I I I I I I I I e 2 i , - r- r- r-- r-r--r-r--r--r-----r--r-r--r--rr--r-r-r- LL I I I I I I I I I I I I PQ 1__L__� 1 __I_ _r _____r _____II__r _____ Time (hours) Post Type 11 24-hr 100 YR Rainfall=9.12" Prepared by Timmons Group Printed 2/4/2021 HydroCAD® 10.00-20 s/n 08663 ©2017 HydroCAD Software Solutions LLC Page 48 Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchmentl$: Post -1Ato P0A1 Runoff Area=1.420 ac 23.24% Impervious Runoff Depth>5.43" Tc=6.0 min CN=70 Runoff=13.14 cfs 0.643 of Subcatchment5S: Post-3 to P0A1 Runoff Area=2.380 ac 36.13% Impervious Runoff Depth >5.19" Tc=6.0 min CN=68 Runoff=21.11 cfs 1.029 of Subcatchment6S: Post -2 to P0A1 Runoff Area=0.220 ac 22.73% Impervious Runoff Depth>7.66" Tc=6.0 min CN=88 Runoff=2.64 cfs 0.140 of Subcatchment7S: Post-6 Runoff Area=0.150 ac 46.67% Impervious Runoff Depth>7.05" Tc=6.0 min CN=83 Runoff=1.71 cfs 0.088 of Subcatchment8S: Post -5 to P0A1 Runoff Area=2.440 ac 76.64% Impervious Runoff Depth>8.27" Tc=6.0 min CN=93 Runoff=30.36 cfs 1.681 of Subcatchment9S: Post-4to P0A1 Runoff Area=2.870 ac 0.00% Impervious Runoff Depth>1.54" Flow Length=503' Tc=8.9 min CN=38 Runoff=5.77 cfs 0.369 of Subcatchmentl OS: Post -1 B to P0A1 Runoff Area=1.980 ac 82.83% Impervious Runoff Depth>7.90" Tc=6.0 min CN=90 Runoff=24.16 cfs 1.304 of Subcatchmentl 1 S: Post -1 C to P0A1 Runoff Area=1.550 ac 12.26% Impervious Runoff Depth>3.20" Tc=6.0 min CN=52 Runoff=8.61 cfs 0.413 of Pond 5P: SWM2 Peak Elev=581.24' Storage=0.208 of Inflow=57.16 cfs 3.126 of Outflow=66.82 cfs 3.123 of Pond 7P: SWM1 Peak Elev=554.73' Storage=0.019 of Inflow=13.14 cfs 0.643 of Outflow=13.46 cfs 0.643 of Link 4L: P0A1 Inflow=112.26 cfs 5.576 of Primary=112.26 cfs 5.576 of Total Runoff Area = 13.010 ac Runoff Volume = 5.668 of Average Runoff Depth = 5.23" 61.49% Pervious = 8.000 ac 38.51% Impervious = 5.010 ac Post Type 11 24-hr 100 YR Rainfall=9.12" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 1S: Post AA to POA1 Runoff = 13.14 cfs @ 11.97 hrs, Volume= 0.643 af, Depth> 5.43" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 100 YR Rainfall=9.12" Area (ac) CN Description 0.330 98 Paved parking 1.090 61 >75% Grass cover, Good, HSG B 1.420 70 Weighted Average 1.090 76.76% Pervious Area 0.330 23.24% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 1S: Post AA to POA1 Hydrograph I I I I I I I I I 14 13 I I I I I I I I I I I I I I I I I I I I 12 I I I I I I I I I I 11 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I --r---r--r--r--r--r--r--r-r--. 9 I I I I I I I I I I I ^. i08 I I I I I I I I I I I I I I 7 LL 6 5 I I I I I I I I I I I I I I I I I I 4 I I I I I I I I I 3 I I I I I I I I I I I 2 I I I I I I I I I I I I1rrr4■Runoff --'--r--r--r- r--I - I I I I I I A00 YIR RWnfaIl;9r1t2"-- I I I I I I I I I I I 1Ri nOff-A►0tr-- 2O at; - I I I I I I Run6ffrVolume=0.643 of Runoff Dee/p�th>5.43" I I I I I I I I I I I I I I I I I - I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I i 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 rime (hours) Post Type 11 24-hr 100 YR Rainfall=9.12" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 5S: Post-3 to POM Runoff = 21.11 cfs @ 11.97 hrs, Volume= 1.029 af, Depth> 5.19" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 100 YR Rainfall=9.12" Area (ac) CN Description 0.860 98 Paved parking, HSG A 0.710 39 >75% Grass cover, Good, HSG A 0.810 61 >75% Grass cover, Good, HSG B 2.380 68 Weighted Average 1.520 63.87% Pervious Area 0.860 36.13% Impervious Area Tc Length U. 1 Capacity Description Direct Entry, Subcatchment 5S: Post-3 to POM Hydrograph [;21 I I I I I I I I I I I--L--L__I---1___1__J I I I I I I I I I I I --r1T�--T--r--r- I I I I I I I I I I --L--1--J--J--J--a--L--L--1---1- __}__r__r__I___I_ _. I I I I I I I I I I I I I I I I I I I I - L--1--J--J--J--a--L--L--1---1-- - r-r-r--r--r-r--r-r-r1-_. I I I I I I I I 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 1 �--r--r--r--r--r--r I I I I I _ , r Txpg-111124-hr I I I I I I I I I I I _ � 00 YR RainfaIMA2"` _____i•__r__r I I �__�__r__r__r__ 'R_ tinW, A_ r_et_=2_.38.0_at- ftrrpffFVip1Lf—M- ' ,'1:02 -at- - tunoifi;Dep7 T 7 7`= ---1 iTy T V.N by _ _r-r--r--r--r----r-r-r-r--r-_ I -T -T -T -r I I 1--T -T I I I I I I I I I I I 1 - ---r--r --r 1 I 1--7--1--1-4-- __ L__ L__ L- I I I I I I I 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Time (hours) ❑ Runoff Post Type 11 24-hr 100 YR Rainfall=9.12" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 6S: Post -2 to POM Runoff = 2.64 cfs @ 11.96 hrs, Volume= 0.140 af, Depth> 7.66" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 100 YR Rainfall=9.12" Area (ac) CN Description 0.050 98 Paved parking 0.120 80 >75% Grass cover, Good, HSG D 0.050 96 Gravel surface, HSG D 0.220 88 Weighted Average 0.170 77.27% Pervious Area 0.050 22.73% Impervious Area Tc Length Capacity Description 6.0 Direct Entry, Subcatchment 6S: Post -2 to POM Hydrograph ❑ Runoff Type II 24-hr 100 YR Rainfall=9.12" 2 Runoff Area=0.220 ac Runoff Volume=0.140 of 3 Runoff Depth>7.66" LL Tc=6.0 min CN=88 0 9 1 2 3 4 5 6 7 8 9 19 11 12 13 14 15 16 17 18 19 29 21 22 23 24 Time (hours) Post Type 11 24-hr 100 YR Rainfall=9.12" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 7S: Post-6 Runoff = 1.71 cfs @ 11.96 hrs, Volume= 0.088 af, Depth> 7.05" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 100 YR Rainfall=9.12" Area (ac) CN Description 0.070 98 Paved parking 0.020 39 >75% Grass cover, Good, HSG A 0.060 80 >75% Grass cover, Good, HSG D 0.150 83 Weighted Average 0.080 53.33% Pervious Area 0.070 46.67% Impervious Area Tc Length Capacity Description 6.0 Direct Entry, Subcatchment 7S: Post-6 Hydrograph ❑ Runoff Type II 24-hr 100 YR Rainfall=9.12" Runoff Area=0.150 ac Runoff Volume=0.088 of Runoff Depth>7.05" Tc=6.0 min CN=83 9 1 2 3 4 5 6 7 8 9 19 11 12 13 14 15 16 17 18 19 29 21 22 23 24 Time (hours) Post Type 11 24-hr 100 YR Rainfall=9.12" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 8S: Post -5 to POM Runoff = 30.36 cfs @ 11.96 hrs, Volume= 1.681 af, Depth> 8.27" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 100 YR Rainfall=9.12" Area (ac) CN Description 1.870 98 Paved parking 0.020 39 >75% Grass cover, Good, HSG A 0.010 61 >75% Grass cover, Good, HSG B 0.540 80 >75% Grass cover, Good, HSG D 2.440 93 Weighted Average 0.570 23.36% Pervious Area 1.870 76.64% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 8S: Post -5 to POM Hydrograph ❑ Runoff 3036 cfs i I I I I i i I I I I I I I I I 71--,--.-- Type II 24-hr ---r- 100 YR Rainfall=9.12rr I I I I - I I Runoff Area=2.440 ac ------,--,--7--r-- -- - Runoff Volume=1.681 of 20 N Runoff Depth>8.27" V 1E _ --- 6 Tc=6.0 min LL 14 ----II--.-------II- --,-- 12 --J--i-CN=93 8 4 i i 11 12 13 Time (hours) Post Type 11 24-hr 100 YR Rainfall=9.12" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 9S: Post-4 to POM Runoff = 5.77 cfs @ 12.03 hrs, Volume= 0.369 af, Depth> 1.54" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 100 YR Rainfall=9.12" Area (ac) CN Description 0.190 96 Gravel surface, HSG D 2.340 30 Woods, Good, HSG A 0.070 77 Woods, Good, HSG D 0.130 39 >75% Grass cover, Good, HSG A 0.140 80 >75% Grass cover, Good, HSG D 2.870 38 Weighted Average 2.870 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.5 100 0.1200 0.26 Sheet Flow, Grass: Dense n= 0.240 P2= 3.70" 2.1 263 0.1800 2.12 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 0.3 140 0.0570 7.43 44.57 TrapNee/Rect Channel Flow, Bot.W=5.00' D=1.00' Z= 1.0'/' Top.W=7.00' n= 0.040 Windinq stream, pools & shoals 8.9 503 Total Subcatchment 9S: Post-4 to POM Hydrograph ❑ Runoff 6 s7 cfs Type 11 24-h r 5 100 YR Rainfall=9.12" Runoff Area=2.870 ac 4 Runoff Volume=0.369 of Runoff Depth>1.54" 3-Flow Length=503' Tc=8.9 min 2 CN=38 9 1 2 3 4 5 6 7 8 9 19 11 12 13 14 15 16 17 18 19 29 21 22 23 24 Time (hours) Post Type 11 24-hr 100 YR Rainfall=9.12" Timmons Summary for Subcatchment 10S: Post -1 B to POM Runoff = 24.16 cfs @ 11.96 hrs, Volume= 1.304 af, Depth> 7.90" Printed 2/4/2021 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 100 YR Rainfall=9.12" Area (ac) CN Description 1.640 98 Paved parking 0.230 39 >75% Grass cover, Good, HSG A 0.110 80 >75% Grass cover, Good, HSG D 1.980 90 Weighted Average 0.340 17.17% Pervious Area 1.640 82.83% Impervious Area Tc Length Capacity Description 6.0 Direct Entry, Subcatchment 10S: Post -1 B to POM Hydrograph --L -- L --L ------- -- -- - - - - - 26 -i -i -i -i -i ❑Runoff i 24 Type II 24-hr 22--r----��'----7--r--r--'r--'�-- �'�--,�' .100-X-R Rainfall;*AT'-- 20 ' I I'I I -- Rn6# Me r.M-aic - 16 ftt�rrpff,tfpit�rrte w 1a -------;--+--hunoff:Dep h>T.9O1F- - 3 ,� 12 � � � � � � � � � � � � � � � � Tc-6.0 Itlrlilh __1--1--L--L--L-J--J--1--1--L--L-- i I I I I I I I I I I I I I I I I I I 10 I N=9 2 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Post Type 11 24-hr 100 YR Rainfall=9.12" Prepared by Timmons Group Printed 2/4/2021 Summary for Subcatchment 11S: Post AC to POM Runoff = 8.61 cfs @ 11.98 hrs, Volume= 0.413 af, Depth> 3.20" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 100 YR Rainfall=9.12" Area (ac) CN Description 0.190 98 Paved parking 1.010 39 >75% Grass cover, Good, HSG A 0.300 61 >75% Grass cover, Good, HSG B 0.050 80 >75% Grass cover, Good, HSG D 1.550 52 Weighted Average 1.360 87.74% Pervious Area 0.190 12.26% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 11S: Post -1C to POM Hydrograph ❑ Runoff 9 e6 fs s I I I I I I Type II 24-hr ------------------------------- 100 YR Rainfall=9.12" -------------------------- Runoff Area=1.550 ac Runoff Volume=0 413 of Runoff Depth>3.20" ------ -- --- - Tc=6.0 min LL 4 I I I I I I I GN=5� 9 i p Time (horns) Post Type 11 24-hr 100 YR Rainfall=9.12" Prepared by Timmons Group Printed 2/4/2021 Summary for Pond 5P: SWM2 Inflow Area = 4.640 ac, 76.72% Impervious, Inflow Depth > 8.08" for 100 YR event Inflow = 57.16 cfs @ 11.96 hrs, Volume= 3.126 of Outflow = 66.82 cfs @ 11.95 hrs, Volume= 3.123 af, Atten= 0%, Lag= 0.0 min Primary = 66.82 cfs @ 11.95 hrs, Volume= 3.123 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 581.24' @ 11.95 hrs Surf.Area= 0.000 ac Storage= 0.208 of Plug -Flow detention time= 3.9 min calculated for 3.123 of (100% of inflow) Center -of -Mass det. time= 3.3 min ( 766.2 - 762.8 ) Volume Invert Avail.Storage Storage Description #1 549.00' 0.208 of 96.0" Round Pipe Storage L= 180.0' Device Routing Invert Outlet Devices #1 Primary 549.00' 24.0" Round Culvert L= 59.0' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 549.00' / 547.23' S= 0.0300 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 3.14 sf #2 Device 1 549.00' 15.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 553.10' 20.0" Vert. Orifice/Grate C= 0.600 #4 Device 1 556.00' 8.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=65.36 cfs @ 11.95 hrs HW=579.95' (Free Discharge) L1=Culvert (Inlet Controls 65.36 cfs @ 20.80 fps) 2=Orifice/Grate (Passes < 32.54 cfs potential flow) 3=Orifice/Grate (Passes < 53.58 cfs potential flow) =Sharp -Crested Rectangular Weir(Passes < 1,533.19 cfs potential flow) Post Timmons Pond 5P: SWM2 Hydrograph Type 11 24-hr 100 YR Rainfall=9.12" Printed 2/4/2021 I I I I I I I I I I I I ------1--r--r-----r--r--�r--- --1-- �r- I-- ssaz«=y (nfil-- A szW �'e��4,69 Be_ I I I I I I I I I cds li I I 1 1 1 ;�4k '�Elb"fy84.;M, - I II I - I-_ -_;_--Stprac[e=0';2Q8_af_ II I I I I I I I _ I__I__I___I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ■ Inflow ■ Primary Post Timmons Type 11 24-hr 100 YR Rainfall=9.12" Summary for Pond 7P: SWM1 Printed 2/4/2021 Inflow Area = 1.420 ac, 23.24% Impervious, Inflow Depth > 5.43" for 100 YR event Inflow = 13.14 cfs @ 11.97 hrs, Volume= 0.643 of Outflow = 13.46 cfs @ 11.98 hrs, Volume= 0.643 af, Atten= 0%, Lag= 0.7 min Primary = 13.46 cfs @ 11.98 hrs, Volume= 0.643 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 554.73' @ 11.98 hrs Surf.Area= 0.000 ac Storage= 0.019 of Plug -Flow detention time= 2.2 min calculated for 0.641 of (100% of inflow) Center -of -Mass det. time= 1.8 min ( 817.2 - 815.4 ) Volume Invert Avail.Storage Storage Description #1 546.00' 0.019 of 48.0" Round Pipe Storage L= 65.0' Device Routing Invert Outlet Devices #1 Primary 546.00' 15.0" Round Culvert L= 42.5' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 546.00' / 541.75' S= 0.1000 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.23 sf #2 Device 1 546.00' 6.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 547.50' 11.0" Vert. Orifice/Grate C= 0.600 #4 Device 1 549.50' 4.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=12.75 cfs @ 11.98 hrs HW=554.09' (Free Discharge) L1=Culvert (Inlet Controls 12.75 cfs @ 10.39 fps) 2=Orifice/Grate (Passes < 2.65 cfs potential flow) 3=Orifice/Grate (Passes < 7.87 cfs potential flow) =Sharp -Crested Rectangular Weir(Passes < 99.11 cfs potential flow) Post Type 11 24-hr 100 YR Rainfall=9.12" Prepared by Timmons Grow Printed 2/4/2021 Pond 7P: SWM7 Hydrograph -- -- ---- -- -- ---- -- -- -- ---- I I I I I I I I I I I I 15 --- --I --1 ■nflw 1 1 ■Primary 13.45cfs (5 �n_,_gwArQaF-.l a�_ 13 _ _ _ 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 , 1 � 1 1 12 � - - -- 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 —S1 t—bT r—oge=0.09 9 of ,O 1 T r _i 1— _T r _i i i i i i I I I I I I I I I I I 9 I I I I I I I —� —T —r —I —1 —1 —r a —r —I .�_. I I I I I I I I I O 7 LL 1 I 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 --'--J-- 5 , 1 1 I 1 1 1 1 1 1 1 1 1 1 1 3 1 1 1 1 1 1 1 1 1 I 1 I 1 I I I 1 I 1 I 1 1 1 1 1 1 1 1 1 1 1 1 1 2 4 5 6 7 8 9 10 11 12 13 Time (hours) Post Type 11 24-hr 100 YR Rainfall=9.12" Prepared by Timmons Group Printed 2/4/2021 Summary for Link 4L: POM Inflow Area = 12.860 ac, 38.41 % Impervious, Inflow Depth > 5.20" for 100 YR event Inflow = 112.26 cfs @ 11.96 hrs, Volume= 5.576 of Primary = 112.26 cfs @ 11.96 hrs, Volume= 5.576 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 4L: POM Hydrograph ■ Inflow ■ Primary Time (hours) Lt Outlet Protection Summary Outlet Dixharge pipe L. W d5o cl o 3Do Ounall arl Diameter ft cis it ft ft in ft 100 2.5 13.25 8 11 0.5 6 7.5 PIPE OUTLET CONDITIONS 11111111111` iINS�I�NN I, pip Eia dN�v�V�:� �"s1�p¢.r�dpEgagtlIi�kl!®�Ip��IRI�� W gapl!�ii N�c �IpI�: 'adGdil�y�OO �'' ,�N��iI9111! ,II��I�r i"iPill'll ol�l�9�IB�11�6H��I�I��IN��1 6Pr,r r�dw�� IY F - i!oall,illCrll r dd�°a�rlaEk°r I 'Ili In �_- �n�ppppN� i�gp�pIl�p�q��NyyypVp�,11!w :�r.Wlr�d' uG NN'::1®IWI®p ®N/!ROMPr- I YIIIII.