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Home My WebLink AboutWPO202000051 Calculations 2021-04-16BOYS AND GIRLS CLUB - DRIVER'S EDUCATION SITE COUNTY OF ALBEMARLE, VIRGINIA DESIGN CALCULATIONS & NARRATIVE REF. WP0202000051 NOVEMBER 4, 2020 REV. APRIL 9, 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 APPROVED by the Albemarle County Community Development Department Date 04/15/2021 File WP0202000051 a G W.7. KWAnsxi Lic. 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 5.15 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 0.90 acres of forest. In the proposed condition, there will be 2.23 acres of impervious cover and 2.92 acres of managed turf. Per the Virginia Runoff Reduction Spreadsheet, this development will require that 1.62 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 (Pre -Developed Drainage Area 2) is first conveyed through a series of pipes to an existing manufactured wetland facility, before it is discharged into the stream. The central and eastern portions of the site (Pre -Developed Drainage Areas I and 3) are conveyed through a series of pipes to a concrete channel, bypassing the manufactured wetland facility, before being ultimately 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. SWMI is located on the western portion of the site and outfalls into an existing pipe, which will convey this flow (Post -Developed Drainage Area IA) into the existing manufactured wetland facility and ultimately to the southern stream. SWM2 is located on the eastern portion of the site and outfalls into a series of proposed pipes that bypass the manufactured wetland facility and eventually outfall into the southern stream; this system conveys water from Post -Developed Drainage Areas 113 and 2. 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 Designed by: LOCATION: COUNTY: Albemade Checked by: UNITS ENGLISX PIPE NO FROM POMT TO POMT DRAM. AREA 'A' Acre (3) RUNOFF COEFF. C. (d) CA TOTAL INLET T[ME Mints (]) RAM FALL INHr (8) RUNOFF Q CPS (9) MVERT ELEVATIONS LENGTH of Pipe Ft (12) SLOPE Fr/Fr (13) SIZE Go. Or Spanounc) In (14) SHAPE Capacity CPS (IS) FncOon Slope Fr/Fr VEL V. FtlB (16) FLOW TIME Min (17) REMARKS (I8) MCRE- MENT (5) ADDTL CA ACCUM- ULATED (6) UPPER END (10) LOWER END (11) REFERENCE (1) STA REFERENCE (2) SEA. 111 112 110 O.WO OW O.WO 463S 6635 60W 6230 28.ST1 Sd9000 507 San 23668 0.060 NM Circular An 024 0014 18%) 0021 Ondhdlfi SWM2 109 110 108 0M 0WO 0M 463S 0000 6.021 62U 28.848 563810 502000 36208 0.050 NM Cimular 56.7W 0014 177M 0OU 107 108 106 0M 0WO 0M 463S 0000 6.05S 6216 28.802 536931 S33709 20628 0.050 NM Clmuhr 56.7W 0014 17697 0023 125C 126 125B 0.IN 0610 ON9 ON9 0000 6.000 62" 0307 534635 S30000 39073 OWS ISM Cimuhu 0.947 0000 22d0 02% MA 125B 106 0.050 03% 0.04 0.069 0000 62% 63G6 0422 534338 S3 1% 29606 0IRS ISM Cimular 0.947 0000 2A66 0200 105C IW 1056 0.030 0370 0.011 Q]IS 0000 1 6.OW 1 62" 29370 532790 S31 SOO 25.791 0.050 1 NM Clmuhr 5 7W 0014 117783 0024 127 128 1056 0.010 0 <00 0ON 0ON 0000 0.000 $901 0.036 532515 S32220 9823 0.030 12M Cimular 6683 0M 2261 0072 IOSA IOSB HA 0M 0WO 0M 4719 0000 6.ON 6223 29365 530010 S29250 37989 0.04 NM Cimular 3 65S 0014 12d06 0051 117 118 1 0.0% 0350 0.032 0.032 0000 60W 62" 0.1% 562%2 S40.806 SO M3 0N2 ISM Cimular 16422 0000 6.151 0202 Hs 116 114 0.080 0620 0.034 0.065 0000 6202 6.171 0402 561023 S30200 108380 0.063 IS WO Cimular 17 503 0M 59W 0306 113 IIJ 104 02" 0360 0.OW 0. 162 0000 6.508 60M 0988 534139 S30.856 93.8S1 0.03S IS OW Clmuhr 13089 0M 62W 0249 121 122 120 0.130 03SO 0W 0W 0000 60W 62" 0283 533701 S31.153 S09S5 0.050 ISM CImW ISW 0M 6910 0.1]3 119 120 104 0. 110 07SO 0.083 0. 128 0000 6.1]3 6.IM 0791 531050 S29300 171023 0.010 ISM Circular 69% 0M 3786 0753 103 IM 102 0.IN 0.740 0.089 S.098 0000 6926 5970 30637 527 Od1 S20370 76311 0.087 300W Cimular 131373 OWS 21.822 0058 101 102 100 0.000 0M 0.000 S.098 0000 6984 5955 303S8 516032 S12670 99 NO 0.034 300W CImWar 81861 OWS ISd67 0.107 216B 214C 216A 0.04 0.900 0.018 0.018 0000 0.000 $901 0lw 556751 SS M 140.129 0.010 12M Cimular 0622 0000 275S 0.848 213 214A 212 02" 0610 0. 16S 0.183 0000 0US $367 1.529 554639 S53380 125 Q2 0.010 ISM Clmuhr 69% 0M 6573 0459 209 212 208 0.1% 0660 0325 0308 0000 1307 8.10] 2498 5532" S52910 73.826 0IRS ISM Clmuhr 0.947 OWI 6050 03M 207 208 206 02% 0730 0212 0.54 0000 1.610 7945 4130 5528W S51.880 183.742 0IRS 21 OW Cimular 12203 OWI 6592 0667 205 206 204 034 0TO) 02d6 0]66 0000 22]9 7615 S.83S 551)]6 SSI 403 74.546 0IRS NM Cimular 17327 OWI 698S 0249 215C 216 215B 0W 04% 0.04 03N 0304 0.000 $901 2.880 556362 S55335 102.]00 0.010 12M Cimular 3.858 0006 53N 0317 Roofdnin area fiom BLDG2 21SA 215B 2" 0.010 09W 0.009 0333 0000 0317 $692 2.891 554 OR S53.$38 11613 0.04 120W Cimular 5457 0006 7 061 0027 203 204 202 0M 0WO 0M 1450 0352 2.527 ]SW 108T1 551303 550336 193.SM 0IRS NM Cimular 17327 0 002 5838 OS53 OlBia wernr fmm EK3 217 218 202 0000 0SOO 00W 1250 1250 0.000 $901 11.126 55604 S53415 120912 0IRS NM Cimular 17327 0 002 5MS 0343 OlBia waarfrom EKl 201 202 200 0.W 0.730 0321 3668 0N6 3.ON 7258 26620 5502d0 S50001 9]2] 0.04 300W Cimular 63SM 0ON 12402 0013 018ia waterfiom E%2 301 302 300 O.WO OM O.WO 0.884 OSM 6.000 62" S.!RM I S16.000 I 501.881 1 41.192 1 0100 1 ISM C-ularl n12J 1 0006 1149981 OW I OntoOl From $WMI 403 4(M 402 0.180 0$no 01" 0M 0.1" 6.000 62" 0.89] 1 553W0 1 S50956 12044251 0.010 1 ISM Cimular 69% 1 Om 1392710801 401 102 400 0300 0.740 0222 00W 03M 6.868 59M 2.191 1 SSOWO I 507790 1 73665 1 0.030 1 ISM Cumuhul 121181 OWI 17508 0.16A 503 504 S02 0 W 0360 0202 0M 0202 60W 6056 1 0.816 1 56].121 1 S46.170 11901891 OWS 1 ISM C-uhul 0947 1 Om 12987110611 501 502 Soo 0380 0370 0. 161 0M 0342 7061 3.$53 1 1319 1 S 069 1 S46000 1 138051OOOSJ ISM Cumularl 09470M 3418 0067 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 EtE DIA PIPE Do (In) DESIGN DISCH. Go (CFS) LENGTH PIPE LO (Ft) FRICTION SLOPE, SW (FT/FT) FRICTION LOSS Hf (Ft) JUNCTION LOSS FINAL H (Fb INet Wake SuU Elevatlm RM Eke Coom V. No (ED OI N OM M-2r4 HI Ante HA HI IS HI OE HI 102 516.88 30 30.36 99.04 0.47% 0.46 15.47 0.93 30.44 21.82 664.2 7.39 2.59 0 0 3.52 0 TRUE 2.22 519.1 526.42 OK -7.32 1D4 522.37 30 30.44 76.31 0.47% 0.36 21.82 1.85 29.37 12.41 364.29 2.39 0.84 0 0 2.69 0 TRUE 1.7 524.07 536.8 OK -12.73 105B 530.85 24 29.37 37.99 1.44% 0.55 12.41 0.6 29.37 17.78 522.34 4.91 1.T2 0 0 2.32 0 TRUE 1.7 532.55 536.98 OK 4.42 106 533.1 24 29.37 25.79 1.44% 0.37 1].]8 1.23 28.8 1].] 509.7 4.86 1.7 0 0 2.93 0 TRUE 1.84 534.94 538.9 OK -3.96 108 535.31 24 28.8 24.43 1.38% 0.34 1].] 1.22 28.85 1].] 510.72 4.87 1.7 0 0 2.92 0 TRUE 1.8 537.11 549.39 OK -12.28 110 543.6 24 28.85 36.21 1.39% 0.5 1].] 1.22 28.88 18.96 547.54 5.58 1.95 92.69 3.91 7.08 0 TRUE 4.04 547.64 560.62 OK -12.98 112 549.18 24 28.88 23.67 1.39% 0.33 18.96 1.4 0 0 0 0 0 0 0 1.4 0 TRUE 1.03 550.21 560.76 OK -10.55 114 1 1 531.85 15 1 0.99 193.851 0.02% 0.02 1 6.29 1 0.15 0.4 1 5.9 1 2.37 1 0.54 0.19 1 1.5 1 0 0.34 1 0.45 1 TRUE 1 0.24 532.1 1 538.55 1 OK -6.46 116 1 1 535.24 1 15 1 0.4 1108.381 0.00% 1 0 1 5.9 1 0.14 1 0.2 1 4.15 1 0.81 1 0.27 1 0.09 1 92.68 1 0.19 1 0.42 1 0.54 1 TRUE 1 0.27 1 535.51 1 546.37 1 OK -10.85 118 1 1 541.81 1 15 1 0.2 1 50.26 1 0.00% 1 0 1 4.15 1 0.07 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0.07 1 0.09 1 TRUE I 0.D4 1 541.851 548.74 I OK -6.89 120 1 530.34 1 15 1 0.79 1171.021 0.01% 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 1 0.31 1 TRUE 1 0.17 1 530.51 1 535.89 1 OK -5.37 122 532.15 15 0.28 50.96 0.00% 0 4.91 0.09 0 0 0 0 0 0 0 0.09 0.12 1 TRUE 1 0.06 1 532.21 1 541.43 1 OK -9.21 128 533.02 12 0.04 9.82 0.00% 0 2.26 0.02 0 0 0 0 0 0 0 0.02 0.03 1 TRUE 1 0.03 1533.051 536.65 1OK -3.s 125B 535.19 15 0.42 29.61 0.00% 0 2.47 0.02 0.31 2.24 0.69 0.08 0.03 0.79 0 0.05 0.07 1 TRUE 1 0.03 1 535.221 538.99 1 OK -3.]] 126 535.44 15 0.31 39.07 0.00% 0 2.24 0.02 0 0 0 0 0 0 0 0.02 0.03 1 TRUE 1 0.01 1 535.451 538.99 1 OK -3.54 202 555.98 30 26.62 9.73 0.36% 0.03 12.4 0.6 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 10.88 193.56 0.20% 0.38 5.84 0.13 5.83 4.99 29.09 0.39 0.14 93.39 0.54 0.81 0 TRUE 0.79 557.38 559.88 OK -2.5 206 557.38 24 5.83 74.55 0.06% 0.04 4.99 0.1 4.13 4.59 18.96 0.33 0.11 35.86 0.14 0.35 0.45 TRUE 0.27 557.65 558.5 OK -0.85 208 557.65 21 4.13 183.74 0.06% 0.11 4.59 0.08 2.5 4.05 10.12 0.25 0.09 85.33 0.18 0.35 0.45 TRUE 0.33 557.98 558.71 OK -0.73 212 557.98 15 2.5 73.83 0.13% 0.09 4.05 0.06 1.53 4.57 6.99 0.32 0.11 6.05 0.02 0.2 0.26 TRUE 0.22 558.21 560.1 OK -1.89 214A 558.21 15 1.53 125.92 0.05% 0.06 4.57 0.08 0.16 2.75 0.44 0.12 0.04 89.85 0.08 0.2 0.2] TRUE 0.19 558.4 560.44 OK -2.04 214C 558.4 12 0.16 140.13 0.D0% 0 2.]5 0.03 0 0 0 0 0 0 0 0.03 0.04 TRUE 0.02 558.42 560.82 OK -2.4 218 1 1 556.59 1 24 1 11.13 1120.911 0.21% 1 0.25 1 5.87 1 0.13 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0.13 1 0 1 TRUE 1 0.32 1556.91 1 551.26 1 OK 4.35 215B 557.38 1 12 1 2.89 1 11.61 1 0.56% 1 0.07 1 7.06 1 0.19 1 2.88 1 5.4 1 15.55 1 0.45 1 0.16 1 23.06 1 0.14 1 0.49 1 0 1 TRUE 1 0.31 1 557.69 559.14 1 OK -1.46 216 557.69 1 12 1 2.88 1 102.70.56% 1 0.57 1 5.4 1 0.11 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0.11 1 0 1 TRUE 1 0.69 1 558.37 1 560.5 1 OK -2.13 302 1 1 542.88 1 15 1 5.5 141.191 0.62% 1 0.25 1 15 1 0.87 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0.87 1 0 1 TRUE 1 1.13 1 544.01 1 552.19 1 OK 402 1 549.52 1 15 1 2.19 1 73.671 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 1 549.901 556.94 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 �00��0��0� ■ 000��o�©v�oo. 0 Virginia Runoff 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: 5.35 Site Land Cover Summary Pre-ReDevelopment Land Cover (acres) A soils BSolis CSOIIs DSoils Totals %of Total Forest/Open (acres) 0.53 0.00 0.00 0.37 0.90 17 Managed Turf(acres) 1.01 1.00 0.00 0.27 2.28 44 Impervious Cover (acres) 0.91 0.84 0.00 0.22 1.97 38 5.15 100 Post-ReDevelopment Land Cover (acres) A soils B Soils C S011s D Solis Totals % of Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0 Managed Turri8or ) 1.31 1.39 0.00 0.22 2.92 57 Impervious Cover (acres) 1.14 0.45 0.00 0.64 2.23 43 5.15 100 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 0.51 0.49 0.95 0.48 Treatment Volume(ft) 9,612 8,716 897 8,574 TP Load(lb/yr) 6.04 5.48 0.56 5.39 Total TP Load Reduction Required (lb/yr) 1.62 1.17 0.46 Final Post-Developmem Load (Post-ReDevelopment & New Impervious) Pre- ReDevelopment TN Load (Ib/yr) 43.20 37.85 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) 1.10 1.17 1.12 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 6.04 (lb/yr) Remaining TP Load Reduction (lb/yr) 1.62 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 4/9/2021 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 4/9/2021 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 4/9/2021 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 4/9/2021 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 4/9/2021 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=3.530 ac 33.71 % Impervious Runoff Depth>0.52" Flow Length=759' Tc=7.6 min CN=65 Runoff=2.61 cfs 0.154 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=3.040 ac 1.64% 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=16.45 cfs 0.886 of Primary=16.45 cfs 0.886 of Link 5L: POA1 (Onsite) Primary=0.00 cfs 0.000 of Total Runoff Area = 13.010 ac Runoff Volume = 0.916 of Average Runoff Depth = 0.84" 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 4/9/2021 Summary for Subcatchment 1S: Pre -1 to POM Runoff = 2.61 cfs @ 12.01 hrs, Volume= 0.154 af, Depth> 0.52" 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 0.530 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 3.530 65 Weighted Average 2.340 66.29% Pervious Area 1.190 33.71% 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 Grow Printed 4/9/2021 Subcatchment 1S: Pre -1 to POA7 Hydrograph 261 c(s type I,II �4yhr, 1: YR kaiintall=3.04 -RuhoffArt a='3L530 ad Ru"Off Vo,MurnQ=0.11,,$ 1111 of Ikunoff bepth>p.52" FIoW Lenot&759' Tc=-7.J6 I�,nl�l 1 GN665 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 4/9/2021 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 4/9/2021 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 4/9/2021 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 4/9/2021 Summary for Subcatchment 6S: Pre-4 to POM [731 Warning: Peak may fall outside time span 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 2.290 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 3.040 42 Weighted Average 2.990 98.36% Pervious Area 0.050 1.64% Impervious 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 Windino stream. pools & shoals 8.9 503 Total Pre Type/1 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Grow Printed 4/9/2021 Subcatchment 6S: Pre-4 to POA7 Hydrograph -- -- ---- -- -- -- 0.004 - r----1--r--Ir---- ---T--r_______--r--r—I__----r--r----T--r-r-- �RUnoff 0.004 I __�___�__r__r__r__�__r__r__r__� ____r__r__r__� I __�__r__r__r__�__r__r_ 0.004 _ J_ J- 4J�i-J--J--L------J--L--L------1--1--L---J--1-- - 0.004 -ym L 11- �J11 - �/--}-- - �----}--}--'---'--'--}---------}--}------�--i- -- 0.004 ' -1-Y�RiRaim�fa11=3'4-- - ----}--', --�---- --; --',---,I--� - -- 0.003 1- I r l l r 1 r - ' 0.003 F.� �.�1 -RuhofFArda=3 0404a - :--JI- -} --Ii --:-- --JI--}--I, ----J --L-_ 0.003 - -__r__r__I___I__�__r__r__I_ I�Vqjtj��0Tny#af - 0.003 'u , -I� -ram --T---r--I--T T-- T--r-- _d___ - ~ /� /� r--�-- ---i--1--Ir- -�--7--r-- 0.002 -ktHIE�'ff- �3th>1M.011' --------L--L----J--L--1-_L- --J--J--L-- LL 002-Fl !_r �1I"0 5-I - -y - -rI - -+I -_-I 0.002 --__ Q Y I_ rI_rr _-rr I- __-Tr r_- _I _-_ T 0.002 _L_ i 0.007 0.001 -T -r -' -� -T -T -i -' -� -T -r -� :--I- 0.001__ L _J _L _L _I _ _J _L _L I_ J 0.001 0.000 -T 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 4/9/2021 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 4/9/2021 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 4/9/2021 Summary for Link 4L: POM Inflow Area = 12.740 ac, 36.58% Impervious, Inflow Depth > 0.83" for 1 YR event Inflow = 16.45 cfs @ 11.98 hrs, Volume= 0.886 of Primary = 16.45 cfs @ 11.98 hrs, Volume= 0.886 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 -- --1-_--_--II I-_--___�'�____ I I -��---------- ----1 ■Inflow ■ Pnmary r-rr--r--- r-r Inflow Area =140Ac- 7 II I I rI r -I- - 1 711 -111 -------- -I- _,__r_r_r _IrI_- __ 1248 1 ,' 1 I I 1 _ I__r__7__r__I___I__r__r__I__�_ 1 1 1 1 1 --r--r_r__7__r__I__r__7__r__r__I__ 1 1 1 1 1 1 1 _y -Y -Y -I -I -y -Y -I g 1 1 1 1 1 1 1 1 1 1 -y -T -Y -I -I -Y -Y -I --t 1 1 1 1 1 1 1 1 1 1 1 -r -I -y -+ -Y -I -y -T -Y -r -I LL g 1 I I I I I I I I -7 -Y -Y ] I -Y -T -Y -I -I -Y -Y -I --t -r -I - -I -+ -Y -I - -I -T -Y -r -I g 5 I 1 I 4 i I 3 Time (hours) Pre Type 11 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Group Printed 4/9/2021 Summary for Link 5L: POM (Onsite) [431 Hint: Has no inflow (Outflow=Zero) 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 Time (hours) Pre Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 4/9/2021 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=3.530 ac 33.71 % Impervious Runoff Depth>0.85" Flow Length=759' Tc=7.6 min CN=65 Runoff=4.63 cfs 0.249 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=3.040 ac 1.64% Impervious Runoff Depth>0.06" Flow Length=503' Tc=8.9 min CN=42 Runoff=0.02 cfs 0.014 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 Link 4L: POA1 Inflow=23.32 cfs 1.245 of Primary=23.32 cfs 1.245 of Link 5L: POA1 (Onsite) Primary=0.00 cfs 0.000 of Total Runoff Area = 13.010 ac Runoff Volume = 1.287 of Average Runoff Depth = 1.19" 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 4/9/2021 Summary for Subcatchment 1S: Pre -1 to POM Runoff = 4.63 cfs @ 12.00 hrs, Volume= 0.249 af, Depth> 0.85" 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 1.190 98 Paved parking 0.530 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 3.530 65 Weighted Average 2.340 66.29% Pervious Area 1.190 33.71% 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 4/9/2021 Subcatchment IS: Pre -1 to POA7 Hydrograph 4 type',II 24yhr, ZYit alin alb=3.G8" 7 ku�off Arba=1530 iac': -ku":ciff vl Ou:Q=Q 2',49,', of Fkunoff bepth>p.$5'� BoW Le'n-qth =759' Tc=1.,6 M!" GN=6'5 4 5 6 7 11 12 13 14 15 16 Time (hours) ❑ Runoff Pre Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 4/9/2021 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 4/9/2021 11 12 13 Time (hours) ❑ Runoff Pre Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 4/9/2021 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 4/9/2021 Summary for Subcatchment 6S: Pre-4 to POM Runoff = 0.02 cfs @ 15.38 hrs, Volume= 0.014 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 2.290 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 3.040 42 Weighted Average 2.990 98.36% Pervious Area 0.050 1.64% 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 4/9/2021 Subcatchment 6S: Pre-4 to POA7 Hydrograph 0.02 - 0.019 0.018 - ryry{�pp T„- Gh- T-- T --r - -i----,--T--r -'i----T--T--T-- 0.017 --IYv--r--'r------------------�-- 0.016 -Z 10R 'RainlA1=1W I I I 0.014 �� --- -Ruhoff y�.� �y y� /� Arda#3-040'ac 0.013 I I-1I --iI __L_J--1--1— Rjji! f 0.011 a# 0.01 LL1_1__ 0.011 "�I'_L Y��Yi Y V. 3 0.01 ' 0.009 _Flowl6n.0th.-SOW-;--;--}-- 0.008 .-,n__I__�__;__F__I___I_. __F__I___I__�__�__F__I__ �__+__+__ 0.007 _CO8s9_S•'�R•-----'--�--�-----�------i--'-------'---- 0.006 "N- q_tr�ytrII_.r__I___I__y__}__r__I__y__t__�__ _ - L 0.005 __�___�. _r__r__r__I__y__r__r__I___I_.__r__I___I__y__r__r__I__y__7__r__ 0.004 ' _ �--�-- I I I I 7__r__r__I__�__T__r__I___I_. __r__I_____ r__ r__I__ 7__ 7__ r__ 0.003 i-- __i__ 7__ r__ r__i__r__ r__ r__r__�. _r__r__�__ I__ T__r r__ 7__ r__ 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 4/9/2021 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 4/9/2021 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 4/9/2021 LJ...1.. GM, .O nn O/1 ..,.. nOCCO /l Ol14LJ...1...!`Gr, O..N..,..... O.J. d:...... !` rl--- 1. Summary for Link 4L: POM Inflow Area = 12.740 ac, 36.58% Impervious, Inflow Depth > 1.17" for 2 YR event Inflow = 23.32 cfs @ 11.98 hrs, Volume= 1.245 of Primary = 23.32 cfs @ 11.98 hrs, Volume= 1.245 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 I I I I I I I I I I I I I I I I I 23.32 Cs I I I � I 23.32 ch -Inflow Area=12.740 ac I I I I I IIIIIIIIII ---------------------------- , I I I I I -IIIIIIIIII ----- I I--L- I I I I I I I I I I I I I I II I IIIIII (IIIIIIIIII I I I I I I I I IIIIIIIIII IIIIIIIIIII i I I I I I I I I I I I I I I I I I I I I 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-l--T--Y--r--r-�--Y--r-�---Y--r-Y--T--Y--r-�--T--Y--Y--r- , I I I I I I I I I -T ----- I _L _I _J __L__I__J__1__L_J I I I I I I I I I I I I I I I I I I I I I I I I I I I i i I I I I I I Time (hours) ❑ Inflow ❑ Primary Pre Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 4/9/2021 Summary for Link 5L: POM (Onsite) [431 Hint: Has no inflow (Outflow=Zero) 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 Time (hours) Pre Type II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 4/9/2021 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=3.530 ac 33.71 % Impervious Runoff Depth>2.04" Flow Length=759' Tc=7.6 min CN=65 Runoff=11.92 cfs 0.600 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=3.040 ac 1.64% Impervious Runoff Depth>0.47" Flow Length=503' Tc=8.9 min CN=42 Runoff=1.11 cfs 0.120 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 Link4L: POA1 Inflow=46.48 cfs 2.511 of Primary=46.48 cfs 2.511 of Link 5L: POA1 (Onsite) Primary=0.00 cfs 0.000 of Total Runoff Area = 13.010 ac Runoff Volume = 2.590 of Average Runoff Depth = 2.39" 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 4/9/2021 Summary for Subcatchment 1S: Pre -1 to POM Runoff = 11.92 cfs @ 12.00 hrs, Volume= 0.600 af, Depth> 2.04" 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 0.530 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 3.530 65 Weighted Average 2.340 66.29% Pervious Area 1.190 33.71% 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 Timmons Type 11 24-hr 10 YR Rainfall=5.57" Printed 4/9/2021 Subcatchment 1S: Pre -1 to POA7 Hydrograph i -- - :Type-11:24 - 4-0-Y-R-fWittall r&57F'-- -� RunWAtet-3. S30 alp - lROnpff VplOme&0-000ai- - Fldw:Ldndth=759'- ---�c=7;6_rni�t-- 11 12 13 Time (hours) ■ Runoff Pre Type II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 4/9/2021 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 4/9/2021 ❑ Runoff Pre Type II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 4/9/2021 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 4/9/2021 Summary for Subcatchment 6S: Pre-4 to POM Runoff = 1.11 cfs @ 12.06 hrs, Volume= 0.120 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 2.290 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 3.040 42 Weighted Average 2.990 98.36% Pervious Area 0.050 1.64% 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 10 YR Rainfall=5.57" Prepared by Timmons Grow Printed 4/9/2021 Subcatchment SS: Pre-4 to POA7 Hydrograph �� ❑Runoff 111 ca tYP_e lI- 4yhr, 1:0 YR RainfallT5:57 ' Ruihoff Arba=1040 iad Ruhoff Vo,MuMO=Q.1�0'1, of Runoff bepth>6.47', LL FloNv Le;not&503' 7c=8.,0 rni" GN=42 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Time (hours) Pre Type II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 4/9/2021 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 4/9/2021 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 4/9/2021 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 > 2.37" for 10 YR event Inflow = 46.48 cfs @ 11.98 hrs, Volume= 2.511 of Primary = 46.48 cfs @ 11.98 hrs, Volume= 2.511 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 Area=12.740 ac I i I I i I I I i I i i I i I I I I i I i _L _J _1 _L 1 _L _L_J I I i I I i I I I I I I I I I i I i Time (hours) FE ]-I n-fl.-w ❑ Primary Pre Type II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 4/9/2021 Summary for Link 5L: POM (Onsite) [431 Hint: Has no inflow (Outflow=Zero) 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 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 4/9/2021 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 2.170 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) 2.290 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 4/9/2021 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 4/9/2021 Ground Covers (all nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 2.170 2.210 0.000 1.020 0.000 5.400 >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 2.290 0.000 0.000 0.070 0.000 2.360 Woods, Good 9S 5.320 2.210 0.000 1.330 4.150 13.010 TOTAL AREA Post Prepared by Timmons Group Printed 4/9/2021 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 4/9/2021 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=2.820 ac 0.00% Impervious Runoff Depth=0.00" Flow Length=503' Tc=8.9 min CN=39 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=1.600 ac 11.87% Impervious Runoff Depth >0.12" Tc=6.0 min CN=51 Runoff=0.03 cfs 0.015 of Pond 5P: SWM2 Peak Elev=553.45' Storage=0.119 of Inflow=16.50 cfs 0.833 of Outflow=10.93 cfs 0.832 of Pond 7P: SWM1 Peak Elev=547.40' Storage=0.006 of Inflow=1.74 cfs 0.087 of Outflow=1.38 cfs 0.087 of Link 4L: P0A1 Inflow=14.16 cfs 1.062 of Primary=14.16 cfs 1.062 of Total Runoff Area = 13.010 ac Runoff Volume = 1.082 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 4/9/2021 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 4/9/2021 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 4/9/2021 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 4/9/2021 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 4/9/2021 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 4/9/2021 Summary for Subcatchment 9S: Post-4 to POM [451 Hint: Runoff=Zero 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 2.290 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 2.820 39 Weighted Average 2.820 100.00% Pervious 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 Post Type/1 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Grow Printed 4/9/2021 0 LL Subcatchment 9S: Post-4 to POA7 Hydrograph 1 � � � �� ii ❑Runoff ;Type IIll, 24-hr 1 YR Rainfo11:;3.04" Rwnbff Ares=2.820 at: ROngff',Vplt me=0.000 elf Runoff:Depih�0.p0l' Flow:Lonoth=503' Tc=8.,9 I!1 10 dNr-39 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Time (hours) Post Type 11 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Group Printed 4/9/2021 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 4/9/2021 Summary for Subcatchment 11S: Post AC to POM Runoff = 0.03 cfs @ 12.38 hrs, Volume= 0.015 af, Depth> 0.12" 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 1 YR Rainfall=3.04" Area (ac) CN Description 0.190 98 Paved parking 1.060 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 1.600 51 Weighted Average 1.410 88.12% Pervious Area 0.190 11.87% 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 I I I I I ------------------------- _7__7__7____7__7__T r Type ill 24-h' TI t 1 YR Rainfa11=3.04"__,_ Runoff Area=1.600'ac- Runoff Volume=0.015 of Runoff Deptty>U.1-3" Tc=6z0-mint-- I I I I I I CN=$1- - +I II, I 7 7 7I _T _r _I _7 _T _Y _I_ __I I I I I I I I I I I I I I I I I I I I I I ' ' ' ' ' - - ■Runoff I 7 ; 7-7--7--7-- I I _I__y__T __T __Y__I__y__T I I I I I I I I I I I _I _L _L_J _J _1 _L 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 __1__L__I__ _L_J__J__1__1__ I I _T _Y _I _I _Y _T _Y _I I I I L_ !__J__1__1__ I I I I I I I I I I I I Time (hours) Post Type 11 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Group Printed 4/9/2021 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 = 10.93 cfs @ 12.05 hrs, Volume= 0.832 af, Atten= 34%, Lag= 4.9 min Primary = 10.93 cfs @ 12.05 hrs, Volume= 0.832 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 553.45' @ 12.05 hrs Surf.Area= 0.033 ac Storage= 0.119 of Plug -Flow detention time= 5.3 min calculated for 0.830 of (100% of inflow) Center -of -Mass det. time= 4.4 min ( 801.8 - 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' 14.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 553.10' 27.0" 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=10.87 cfs @ 12.05 hrs HW=553.44' (Free Discharge) L1=Culvert (Passes 10.87 cfs of 22.15 cfs potential flow) 2=Orifice/Grate (Orifice Controls 10.11 cfs @ 9.46 fps) 3=Orifice/Grate (Orifice Controls 0.76 cfs @ 1.99 fps) =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 4/9/2021 ----,--T--r--r----,--r--r-,--,--Y--r--r -,-- T--r----,--T-- r-- r --I-- - --- ----7--r--r- i-- --- r- --- -- -- - - -- --_rII -iI �II 7II -rIIIr rTII I OWT4,76QXn A-e��4-aIrII � -- --Ir-I--Stbrace=OT.'%af r_r 1093c50dB k --I--,--Y--r--r—,-- I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 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 4/9/2021 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 = 1.38 cfs @ 12.04 hrs, Volume= 0.087 af, Atten= 21 %, Lag= 3.1 min Primary = 1.38 cfs @ 12.04 hrs, Volume= 0.087 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 547.40' @ 12.04 hrs Surf.Area= 0.006 ac Storage= 0.006 of Plug -Flow detention time= 2.4 min calculated for 0.087 of (100% of inflow) Center -of -Mass det. time= 1.7 min ( 877.4 - 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' 7.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 547.30' 9.0" Vert. Orifice/Grate C= 0.600 #4 Device 1 549.70' 4.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=1.35 cfs @ 12.04 hrs HW=547.36' (Free Discharge) L1=Culvert (Passes 1.35 cfs of 4.01 cfs potential flow) 2=Orifice/Grate (Orifice Controls 1.33 cfs @ 4.99 fps) 3=Orifice/Grate (Orifice Controls 0.02 cfs @ 0.86 fps) =Sharp -Crested Rectangular Weir( Controls 0.00 cfs) Post Type/1 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Group Printed 4/9/2021 Pond 7P: SWM7 Hydrograph ■ Inflow ,.va ae S Primary I',nflow',Are0l .,420 ', ac Poclk F-10=¢47.40' 18ofs Storage=0; 006 of LL 1 2 3 4 5 6 7 8 9 10 11 12 13 Time (hours) Post Type 11 24-hr 1 YR Rainfall=3.04" Prepared by Timmons Group Printed 4/9/2021 LJ...1.. GI'1 4n nn Ord ..,.. nOCCO /l nA4 LJ...1...!`GI'1 O..N..,..... O.J. d:...... !` rl--- 1 Summary for Link 4L: POM Inflow Area = 12.860 ac, 38.41 % Impervious, Inflow Depth > 0.99" for 1 YR event Inflow = 14.16 cfs @ 12.03 hrs, Volume= 1.062 of Primary = 14.16 cfs @ 12.03 hrs, Volume= 1.062 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs 1 1 1 1 1 1 1^ 0 LL Link 4L: POM Hydrograph -Inflow Area=12.861R " I I I I i J I I I I I I I I I I I _I _y I I I I I i _ I_ I I I I I " I --_T -- -I -I _T _T I I I I i I I-_L__I__ I I I I I I I Time (hours) I___i__�__7__�_ �___I- I I I ❑InFlow _+_-'--+__+--+--'--�--,--+--+--'-_ ❑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 _r _I _y _T _r _I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I _r _, _T _r _I _l _T _r _r _I Post Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 4/9/2021 HydroCAD® 10.00-20 s/n 08663 ©2017 HydroCAD Software Solutions LLC Page 21 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=2.820 ac 0.00% Impervious Runoff Depth>0.02" Flow Length=503' Tc=8.9 min CN=39 Runoff=0.01 cfs 0.004 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=1.600 ac 11.87% Impervious Runoff Depth>0.27" Tc=6.0 min CN=51 Runoff=0.33 cfs 0.036 of Pond 5P: SWM2 Peak EIev=554.20' Storage=0.143 of Inflow=20.85 cfs 1.067 of Outflow=17.60 cfs 1.066 of Pond 7P: SWM1 Peak EIev=547.89' Storage=0.009 of Inflow=2.73 cfs 0.132 of Outflow=2.61 cfs 0.132 of Link 4L: POA1 Inflow=24.26 cfs 1.438 of Primary=24.26 cfs 1.438 of Total Runoff Area = 13.010 ac Runoff Volume = 1.464 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 Grow Printed 4/9/2021 Summary for Subcatchment 1S: Post 4A 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, Subcatchment 1S: Post -1A to POA1 3 ■ Runoff T 'pe II', 24-Mr 2 YR ftinfall:;3.68"' Rwnbff Abet 1.420-at- 2 P.Ongff', Vgl0me=0. j 32 gf kunoff bepih>1.,121' Tc=6:0 lirtitt 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 4/9/2021 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 4/9/2021 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 4/9/2021 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 4/9/2021 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 Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 4/9/2021 Summary for Subcatchment 9S: Post-4 to POM [731 Warning: Peak may fall outside time span Runoff = 0.01 cfs @ 24.00 hrs, Volume= 0.004 af, Depth> 0.02" 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 2 YR Rainfall=3.68" Area (ac) CN Description 0.190 96 Gravel surface, HSG D 2.290 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 2.820 39 Weighted Average 2.820 100.00% Pervious 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 Post Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Grow Printed 4/9/2021 Subcatchment 9S: Post-4 to POA7 Hydrograph 0.009--------_I-_I_--I ______________ I I__ I__ ❑Runoff 0.008 I I I I o.p� dp0.007 I I I I I Iril 1�[p- 7f�t47b-I--+--1 7 r F --7I--,- _ +0.007 -ZYRRafinfall=3d8'l--j------I --------- 0.006 1 1 1 1 11iff AriDa=2.820'1ad I- -T--r--I--,--,--T-- 0005tunoff-Vqlu�h004a 4r.OooS 1 1 1 1 1 10.004 ---- ept------ 2,E1/�`-,(�` --7--7-- 0.0� -y �[�--T--� i- -t -r- -, -i -TiL0.0030.003 V'wdnyCWV3' -TO__+__+__I__+__+__+__-p1 1 1 1 11 1 1 1 10.0021 1 I 1 1 1--r--r--I--r--r--r-- 0.002 1 1 1 1 1 0.0011 1 1000--i--L- --J--1--I 4 5 6 7 8 9 10 11 12 13 Time (hours) Post Type 11 24-hr 2 YR Rainfall=3.68" Timmons Summary for Subcatchment 10S: Post -1 B to POA1 Runoff = 8.56 cfs @ 11.97 hrs, Volume= 0.431 af, Depth> 2.61" Printed 4/9/2021 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 ' 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 Description 6.0 Direct Entry, Subcatchment 10S: Post -1B 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 9 J J J 7lipg 11'1 20 r- s I I I I I I I I I I I I I I I I I I I I ' Runbff Meti=1.980 at: 6 RongKI V91009=I10.J43�,1 elf 5 tunbff NPfh>2.8TI 3 I I I I I I I I I I I I I I I I I I I LL Tc*6- fG fttiti - 4 I I I I I I I I I I I I I I I I I II --I- I F-PW90- 3 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 2 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 1 I I I I I I I I I I I I I I I I I 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 18 19 20 21 22 23 24 Time (hours) ■ RunoR Post Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 4/9/2021 Summary for Subcatchment 11S: Post AC to POM Runoff = 0.33 cfs @ 12.02 hrs, Volume= 0.036 af, Depth> 0.27" 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 2 YR Rainfall=3.68" Area (ac) CN Description 0.190 98 Paved parking 1.060 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 1.600 51 Weighted Average 1.410 88.12% Pervious Area 0.190 11.87% 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 0.36 34 0 33 cfs 0.32 ' type III 241h1r, 0.3 0.28 I -2-YR-RaInfai�1=3 68" -- - --�--- o.zs Ruho�fFArrea`-----r - J - --L *1'�600�aG__L I I 024 .1 Ftuis�-f -Volume=0.036a--I'I-- --�-- 0.22 N 0.2 p Runoff Depth>10.27 _ 0.18 Ii TV.0-M,1h _r__II _r___ �IrCic E 0.16 01 0.12 I I I I i I I I I i i I I i i 0.08 .I 0.06 0.04 I I I I i I I I i i I I 0.02 Time (horns) ■ Runoff Post Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 4/9/2021 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 = 17.60 cfs @ 12.02 hrs, Volume= 1.066 af, Atten= 16%, Lag= 3.2 min Primary = 17.60 cfs @ 12.02 hrs, Volume= 1.066 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 554.20' @ 12.02 hrs Surf.Area= 0.032 ac Storage= 0.143 of Plug -Flow detention time= 5.2 min calculated for 1.063 of (100% of inflow) Center -of -Mass det. time= 4.4 min ( 794.9 - 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' 14.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 553.10' 27.0" 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=16.68 cfs @ 12.02 hrs HW=554.09' (Free Discharge) L1=Culvert (Passes 16.68 cfs of 24.16 cfs potential flow) 2=Orifice/Grate (Orifice Controls 10.93 cfs @ 10.23 fps) 3=Orifice/Grate (Orifice Controls 5.74 cfs @ 3.39 fps) =Sharp -Crested Rectangular Weir( Controls 0.00 cfs) Post Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Grow Printed 4/9/2021 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 -T -r -I -y -♦ -r -I --I -+ -r -r -I ■Inflow 23 20.M as __i ____ I__ _y[_i __I___I__ __i _J__ 0Primary 22 ----------------------'--' /_i 2- -- ----------7--i---- , --, --i -,--, -#+i+l+vl��}I1e4RV-1- 20 ----J--L--L----J--J--L----J--L --L------L--L---J--L- L--L-J-- 19 I I fi�iY = .90, I -- -r-I 18 I 17 16 _1 _L _I _J I I 14 i ,' � , - I -y -T -r -I -I -y -r -I -1 -r -I -7 -T -r -I -y -T 13 ' __ ______I-� --I---- --I--I_ - ---� --I--- 12 I O 1, ' _---,--,--r- u. 10 _J _J _1 _L _I _J 9 .',' , i __I__y__T__r__I___I__Y__r__I__1_ I I _ r__I__y__T__r__I__-I__T__r__r__I__ 6 ,, - r-,--,--r--r--r-,--r--r-,- I 4 ,' � , -I -1 -T -r -I -I -t -f -I 3 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 4/9/2021 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 = 2.61 cfs @ 12.01 hrs, Volume= 0.132 af, Atten= 4%, Lag= 1.7 min Primary = 2.61 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= 547.89' @ 12.01 hrs Surf.Area= 0.006 ac Storage= 0.009 of Plug -Flow detention time= 2.3 min calculated for 0.132 of (100% of inflow) Center -of -Mass det. time= 1.7 min ( 863.4 - 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' 7.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 547.30' 9.0" Vert. Orifice/Grate C= 0.600 #4 Device 1 549.70' 4.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=2.51 cfs @ 12.01 hrs HW=547.86' (Free Discharge) L1=Culvert (Passes 2.51 cfs of 5.18 cfs potential flow) 2=Orifice/Grate (Orifice Controls 1.61 cfs @ 6.03 fps) 3=Orifice/Grate (Orifice Controls 0.90 cfs @ 2.54 fps) =Sharp -Crested Rectangular Weir( Controls 0.00 cfs) Post Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Grow Printed 4/9/2021 2 Pond 7P: SWM7 Hydrograph 2 n ire li li li li li IIIInfloW:Are0l.:142011at POAk FWv=fA7.09,' ----- --Stbr ge=-0;7(YO9-af III II I IIIIIIIIII IIIIIIIIIII IIIIIIIIII I I I I I I I I I I 4 5 6 7 8 9 10 11 12 13 Time (hours) ■ Inflow ■ Primary Post Type 11 24-hr 2 YR Rainfall=3.68" Prepared by Timmons Group Printed 4/9/2021 LJ...1—. GM, .O nn nn ..,.. nOCCO /l nA4 LJ...1...!`Gr, O..N..,..... O.J. d:...... !` rl--- OG Summary for Link 4L: POM Inflow Area = 12.860 ac, 38.41 % Impervious, Inflow Depth > 1.34" for 2 YR event Inflow = 24.26 cfs @ 12.01 hrs, Volume= 1.438 of Primary = 24.26 cfs @ 12.01 hrs, Volume= 1.438 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Inflow Area=12. Link 4L: POM Hydrograph I I I I I I I I I I I I I I I I I I I I I I D 2a 2e crs I I I I I I I I I I I IIIIIIIIII I I I I I I I II - -- - - --- - - ------------7 -- ---- , i I III III I I I I I I (IIIIIIIIII I I I I I I I i I I I I I I I I I 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--1 I -I - r--r- r--T --r --r --I--r-r--r--I-- i I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I Time (hours) ❑ Inflow ❑ Primary Post Type II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 4/9/2021 HydroCAD® 10.00-20 s/n 08663 ©2017 HydroCAD Software Solutions LLC Page 36 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=2.820 ac 0.00% Impervious Runoff Depth>0.33" Flow Length=503' Tc=8.9 min CN=39 Runoff=0.38 cfs 0.077 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=1.600 ac 11.87% Impervious Runoff Depth>1.00" Tc=6.0 min CN=51 Runoff=2.48 cfs 0.134 of Pond 5P: SWM2 Peak Elev=555.88' Storage=0.190 of Inflow=33.59 cfs 1.774 of Outflow=28.95 cfs 1.772 of Pond 7P: SWM1 Peak Elev=549.76' Storage=0.018 of Inflow=6.05 cfs 0.292 of Outflow=5.62 cfs 0.291 of Link4L: POA1 Inflow=46.41 cfs 2.729 of Primary=46.41 cfs 2.729 of Total Runoff Area = 13.010 ac Runoff Volume = 2.777 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 4/9/2021 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 4/9/2021 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 4/9/2021 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 4/9/2021 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 II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 4/9/2021 Summary for Subcatchment 8S: Post -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: Post -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__I 10 ___I__J______L__L__OI IF I I I 1 1 I _J _1Q % _L _I _J _J _1 _♦ _-_ 1 1 1 1 1 1 1 1 i 2 - �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 = 0.38 cfs @ 12.08 hrs, Volume= 0.077 af, Depth> 0.33" Printed 4/9/2021 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 2.290 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 2.820 39 Weighted Average 2.820 100.00% 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 Type II 24-hr 0.36 --- 1 0.34 �/D G C -10II R-Rain-fafr J.J7"----I,L 0.32 0.3 .I --1---1--+---__+--I___I--"--------+ Ruhoff Ardat::2'6820 ac 028 0.26 Runoff Volume=0.077.a o.22 Runoff Dep•th''>14.33"_----IL LL 0.18 FIoW 11LGnt11 _JVJ'_y__`__r 0.14 0.12 //�� q� I I I 11 -dN== 19-I :- 1 ---I-- -- I_ IIIIII 0.04---1-- --T-- -- --I---------- I __T__r__r__ I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I--,--T--T--r--r----,--T--T--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 _+ -r -T -I I -1 -T -r -I -I -, -T -T -I -I -I -I _I1 -I II (IIIIIII IIIIIII 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 4/9/2021 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 4/9/2021 Summary for Subcatchment 11S: Post AC to POM Runoff = 2.48 cfs @ 11.99 hrs, Volume= 0.134 af, Depth> 1.00" 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 10 YR Rainfall=5.57" Area (ac) CN Description 0.190 98 Paved parking 1.060 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 1.600 51 Weighted Average 1.410 88.12% Pervious Area 0.190 11.87% 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" 21 1 II 1 Runoff Area=1.600 ac Runoff Volume=0.134 of 3 Runoff Depth>1.00" LL Tc=6.0 min 'I I 11'� CN=51 11 12 13 14 Time (hours) Post Type II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 4/9/2021 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 = 28.95 cfs @ 12.00 hrs, Volume= 1.772 af, Atten= 14%, Lag= 2.4 min Primary = 28.95 cfs @ 12.00 hrs, Volume= 1.772 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 555.88' @ 12.00 hrs Surf.Area= 0.023 ac Storage= 0.190 of Plug -Flow detention time= 4.7 min calculated for 1.768 of (100% of inflow) Center -of -Mass det. time= 4.0 min ( 780.9 - 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' 14.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 553.10' 27.0" 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=28.84 cfs @ 12.00 hrs HW=555.83' (Free Discharge) L1=Culvert (Inlet Controls 28.84 cfs @ 9.18 fps) 2=Orifice/Grate (Passes < 12.87 cfs potential flow) 3=Orifice/Grate (Passes < 24.28 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 4/9/2021 Pond SP: SWM2 Hydrograph - ----1--L--'-- -I -I I I I I I I I I I I I I I I I I I � Inflow __L__L_J__J__L__L__L_J_- Prima 36 33. 1__L__I__J__1__L__I__J__L J__1 L-J--J 1 J = nfi10 Ar--04,64�QILac _ 32 30 i__ i__i za es zrs IL r�Qi�1�FCY��J`_ '_ i' _ _ _ _ __ _ _ __ _ _ _J _J _1 _L _I _I _J _L _L _I 28 " J L -Storage=fi.49&of_ 26 ,' _L_J _L 24 22 '_L 26 i' _I _J _1 _L 18 LL 16• 14 1 � _I _J _} _L _I _I _; _L _I _� _� _I _J _} _L _I 12 ,' 10 _I _J _} _L _I _I _; _L _I _� _� _I _4 _} _H 6 1 1 1 _I _} _} _F _I _I _; _} _I _y _11 _I _} _} 6' ,' I 1 1 1 I I 1 1 I I I I 1 1 1 I I 1 1 1 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 4/9/2021 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 = 5.62 cfs @ 12.00 hrs, Volume= 0.291 af, Atten= 7%, Lag= 1.8 min Primary = 5.62 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= 549.76' @ 12.01 hrs Surf.Area= 0.003 ac Storage= 0.018 of Plug -Flow detention time= 2.2 min calculated for 0.291 of (100% of inflow) Center -of -Mass det. time= 1.7 min ( 839.7 - 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' 7.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 547.30' 9.0" Vert. Orifice/Grate C= 0.600 #4 Device 1 549.70' 4.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=5.42 cfs @ 12.00 hrs HW=549.71' (Free Discharge) L1=Culvert (Passes 5.42 cfs of 8.19 cfs potential flow) 2=Orifice/Grate (Orifice Controls 2.38 cfs @ 8.90 fps) 3=Orifice/Grate (Orifice Controls 3.03 cfs @ 6.86 fps) =Sharp -Crested Rectangular Weir(Weir Controls 0.01 cfs @ 0.28 fps) Post Type 11 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Grow Printed 4/9/2021 0 LL J Pond 7P: SWM7 Hydrograph ■ Inflow ■ Primary 1'Inflow'IAre6:1:11420'Ilac I S 62 cts I I 1 1 I --I,, 11111111 . 111111111 II I 11111111� 1 St bra 1e=O'1.0'I8 of 1111 111 1 11 III I I I I I I I i 1 1 I I I I I i I I I i I I I 1 1 I I I I i i i i i i i I I I I II I I I I I 1 I I I I I 11111111111 I I I I 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 Time (hours) Post Type II 24-hr 10 YR Rainfall=5.57" Prepared by Timmons Group Printed 4/9/2021 HydroCAD® 10.00-20 s/n 08663 @ 2017 HydroCAD Software Solutions LLC Page 49 Summary for Link 4L: POM Inflow Area = 12.860 ac, 38.41 % Impervious, Inflow Depth > 2.55" for 10 YR event Inflow = 46.41 cfs @ 11.99 hrs, Volume= 2.729 of Primary = 46.41 cfs @ 11.99 hrs, Volume= 2.729 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 5 _ _ _ UAI ■ Pnmery_r_T__r_________-�______T__r_I__T__r_I_II Inf�owv Area=12,8 O lla�45 I I I I I I I I I I i ri 2 LL I I I I I 25 _-1_J _1 _L _I _-I _1 _L _I _J I I I I I I I I I I Time (hours) I I I Post Type 11 24-hr 100 YR Rainfall=9.12" Prepared by Timmons Group Printed 4/9/2021 HydroCAD® 10.00-20 s/n 08663 ©2017 HydroCAD Software Solutions LLC Page 50 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=2.820 ac 0.00% Impervious Runoff Depth>1.65" Flow Length=503' Tc=8.9 min CN=39 Runoff=6.26 cfs 0.389 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=1.600 ac 11.87% Impervious Runoff Depth>3.08" Tc=6.0 min CN=51 Runoff=8.53 cfs 0.410 of Pond 5P: SWM2 Peak Elev=582.81' Storage=0.208 of Inflow=57.16 cfs 3.126 of Outflow=68.48 cfs 3.123 of Pond 7P: SWM1 Peak Elev=555.22' Storage=0.019 of Inflow=13.14 cfs 0.643 of Outflow=13.90 cfs 0.643 of Link4L: P0A1 Inflow=113.71 cfs 5.593 of Primary=113.71 cfs 5.593 of Total Runoff Area = 13.010 ac Runoff Volume = 5.685 of Average Runoff Depth = 5.24" 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 4/9/2021 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 4/9/2021 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 4/9/2021 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 4/9/2021 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 4/9/2021 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 4/9/2021 Summary for Subcatchment 9S: Post-4 to POM Runoff = 6.26 cfs @ 12.03 hrs, Volume= 0.389 af, Depth> 1.65" 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 100 YR Rainfall=9.12" Area (ac) CN Description 0.190 96 Gravel surface, HSG D 2.290 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 2.820 39 Weighted Average 2.820 100.00% 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 7 6 26 cfs 6 Type II 24-hr 100 YR Rainfall=9.12" 5 Runoff Area=2.820 ac Runoff Volume=0.389 of 4 Runoff Depth>1.65" 3 Flow Length=503' Tc=8.9 min 2 CN=39 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 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 4/9/2021 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 4/9/2021 Summary for Subcatchment 11S: Post AC to POM Runoff = 8.53 cfs @ 11.98 hrs, Volume= 0.410 af, Depth> 3.08" 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 1.060 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 1.600 51 Weighted Average 1.410 88.12% Pervious Area 0.190 11.87% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, 6 LL n li li li Subcatchment 11S: Post -1C to POM Hydrograph &sf as 11 1 Type II' 24-hr 1a 0 YR Rainfall=9.12" Runoff Area=1.600 ac Runoff Volume=0.410 of Runoff Depth>3.08" Tc=6.0 min CN=51 --------------------------- ------------------------------ 11 12 13 14 Time (hours) ❑ Runoff Post Type 11 24-hr 100 YR Rainfall=9.12" Prepared by Timmons Group Printed 4/9/2021 Summary for Pond 5P: SWM2 [931 Warning: Storage range exceeded by 25.81' [881 Warning: Qout>Qin may require smaller dt or Finer Routing 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 = 68.48 cfs @ 11.95 hrs, Volume= 3.123 af, Atten= 0%, Lag= 0.0 min Primary = 68.48 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= 582.81' @ 11.95 hrs Surf.Area= 0.000 ac Storage= 0.208 of Plug -Flow detention time= 4.1 min calculated for 3.116 of (100% of inflow) Center -of -Mass det. time= 3.5 min ( 766.3 - 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' 14.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 553.10' 27.0" 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=67.04 cfs @ 11.95 hrs HW=581.51' (Free Discharge) L1=Culvert (Inlet Controls 67.04 cfs @ 21.34 fps) 2=Orifice/Grate (Passes < 29.08 cfs potential flow) 3=Orifice/Grate (Passes < 100.01 cfs potential flow) =Sharp -Crested Rectangular Weir(Passes < 1,685.48 cfs potential flow) Post Type 11 24-hr 100 YR Rainfall=9.12" Prepared by Timmons Grow Printed 4/9/2021 Pond SP: SWM2 Hydrograph ----__--r--r------r—r�--rrrr—r--�---�-- r-rr�-_ E Inflow 75 ■Pnmary 70 ll saaec -lnflawlAre,60464T�ac- ro�I LII Ei 60 55i• __i�___7JII eiY-�01rI .+2�iUI 8•F ,JIl __rLIl ___TLII __71Il _._SI toI raI_If_ 50 ' � --J 1 - --L--'--J--L--L- __�__L--L--L--'-- 45 --I -- I -- i__i______ - 940 0 I I I I I I I I I I I I __I_____ i__ 35 30 i I I I I I I I I I 25 I I I I I I I I I I I I i I I I i i I I i i I i I I I i i I I I i 20 15 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) Post Type 11 24-hr 100 YR Rainfall=9.12" Prepared by Timmons Group Printed 4/9/2021 Summary for Pond 7P: SWM1 [931 Warning: Storage range exceeded by 5.22' [881 Warning: Qout>Qin may require smaller dt or Finer Routing 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 = 13.90 cfs @ 11.99 hrs, Volume= 0.643 af, Atten= 0%, Lag= 1.0 min Primary = 13.90 cfs @ 11.99 hrs, Volume= 0.643 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 555.22' @ 11.99 hrs Surf.Area= 0.000 ac Storage= 0.019 of Plug -Flow detention time=1.9 min calculated for 0.641 of (100% of inflow) Center -of -Mass det. time= 1.5 min ( 816.9 - 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' 7.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 547.30' 9.0" Vert. Orifice/Grate C= 0.600 #4 Device 1 549.70' 4.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=13.06 cfs @ 11.99 hrs HW=554.46' (Free Discharge) L1=Culvert (Inlet Controls 13.06 cfs @ 10.64 fps) 2=Orifice/Grate (Passes < 3.68 cfs potential flow) 3=Orifice/Grate (Passes < 5.54 cfs potential flow) =Sharp -Crested Rectangular Weir(Passes < 103.55 cfs potential flow) Post „t Timmons Pond 7P: SWM7 Hydrograph Type 11 24-hr 100 YR Rainfall=9.12" Printed 4/9/2021 I I I I I I I I I I I I I I I I I I I I ,__ 17__i7 __�__ J__1,__ii___ I 113901 _'i __ii __L_J,__1, __ii _J__J__1,__ii __ii I I I I I cf_ fiow;Are�4 4 01�a6- + ! ! ;Pk'Ele�t=55_a2Z_ I I I I I I I I I I I I --'--4--I--F--'--- '--+-- --'-- 4\\4�� ;- --,F----VtoMae=O.01-Waf- I I I I I I I I I I I I I I I I I I I I I 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 II I 1 _ I _J _1 _L _I _J _J _L _I____L__I__J__1__L_J__J__1__L__L_J__ I I I I I I 1 I I I I I I I I I I I I I I 1 1 1 I --r-1--1--1--r--r-7--r--r-----r_-r-I--r--r--r--I--1--r--r--r- _y _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 I I I I I I I I I I I I I I 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 Type 11 24-hr 100 YR Rainfall=9.12" Prepared by Timmons Group Printed 4/9/2021 Summary for Link 4L: POM Inflow Area = 12.860 ac, 38.41 % Impervious, Inflow Depth > 5.22" for 100 YR event Inflow = 113.71 cfs @ 11.96 hrs, Volume= 5.593 of Primary = 113.71 cfs @ 11.96 hrs, Volume= 5.593 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) Outlet Protection Summary Outlet Discharge L. W d5o d� 31Do Ouffall (10-year) Dia titer ft cfs ft ft ft in ft 100 2.5 30.36 12 15 0.5 6 7.5 PIPE OUTLET CONDITIONS �5 dim 5 C. N a w oe