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HomeMy WebLinkAboutWPO202100003 Calculations 2021-08-31STARBUCKS - 2231 SEMINOLE LANE ALBEMARLE COUNTY, VIRGINIA VSMP DESIGN CALCULATIONS & NARRATIVE JANUARY 19, 2021 REVISED: JUNE 159 2021 •�0000 * s 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 ( ) CRAIG W. I. KO'rAR8KI Y Lie. No. 0402048507 C-0 06/15/2021 �a APPROVED by the Albemarle County Community Dgvpe ? lent Department Date E/ i �1 File WP02021000003 Table of Contents Section Title Project Narrative 2.1 LD-204 Inlet Calculations 2.2 LD-229 Pipe Calculations 2.3 LD-347 Hydraulic Grade Line Analysis Pre -Developed HydroCAD Calculations Post -Developed HydroCAD Calculations NOAA Atlas 14 Rainfall Chart Virginia Runoff Reduction Method Re -Development Worksheet Project Narrative: This project includes the construction of a new building, parking area, utilities and associated site work. The limits of clearing and grading are 0.59 acres. Water Quality The total disturbed area of the project is 0.59 acres. The existing site has been developed and currently includes an office building, a parking lot and utilities. The existing managed turf area is 0.17 acres and the impervious area is 0.42 acres. In the proposed condition there will be 0.15 acres of managed turf and 0.44 acres of impervious cover. The 0.13 lb/yr of phosphorus removal required based on future development will be achieved through the purchase of nutrient credits. Water Quantity The site currently drains to the north towards two Analysis Points. Analysis Point 1 In existing conditions, a portion of the site discharges through channels (concrete channel, gutter, and pipes) to Analysis Point 1. In the proposed condition, an area of 0.56 acres (consists of disturbed and undisturbed areas) is captured and detained in an underground detention system. The system (SWM A) is 30 LF of 66" CMP with a weir plate. SWM A detains the 1-year peak flow rate at Analysis Point 1 to satisfy the energy balance requirement per code section 9VAC25-870-66 B. Lb. Additionally it detains the post -developed 10-year peak flow below the pre -developed 10-year peak flow to satisfy Analysis Point 2 The remaining portion of the existing site travels overland to Analysis Point 2 (0.282 acres disturbed + 0.288 acres undisturbed = 0.57 acres). In the proposed condition, the area flowing to Analysis Point 2 is reduced in order to meet the energy balance requirement for the 1-year peak flow (0.167 acres disturbed + 0.257 acres undisturbed = 0.424 acres). This also results in a reduction of the 10-year peak flow from pre -developed to post -developed to meet code section 9VAC25-870-66C.2.b. There is an additional area of disturbance that is considered sheet flow where the post - development sheet flow runoff is expected to remain the same as pre -development. The reason for this consideration is that the cover and grades will ultimately be the same from pre- to post - development. The proposed work in this small area is to remove one waterline and install another. FORM LO 2N STORMWATER INLET COMPUTATIONS SHEET 1 OF ROUTE PROJECT ShIffi x_Y9 DESIGNER: J. OENKO DATE wlN Z1 CHECKED: UNITSAGUSH mmm�mmmmo®o���mm�m®m®m®®mmmmm®mm��m� �mo�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m� mmm�mmmomom��mm�m�m®mmmm®mmmmmm��m� ®�m�mm�mmmmmmmmmmmmmmmmmmmmmmmmm��m mmmm�mmmomom®®mmo®ommmmmmmmmmmmm��m mmm�mmm0000mmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmm�mmmmmmmmmmmommmm®mm�®®� ��m�mm�mmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmomom��mmo�om®mmmmmmmmmmm��m mmm�mmm0000mmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmm�mmmmmmmmmmmommmmmmm�mtm� ��o�mm�mmmmmmmmmmmmmmmmmmmmmmmmm��m� mmm�mmmo®om�mmmmmmmmmmmm®m�mmmm��m� m�m�mm�mmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmomom��mmmmmm®mmmmmmmmmmm��m mmm�mmm0000mmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmm��mmmmmmmmmmm®mmmmmmm�mtm� ®�m�mm�mmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmomommmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmmomom��®mmmmm®mmmmmmmmmmm��m mmm�mmmmmmm®�mmmmmmmmmmm®mm�mmmm�mtm� mmm�mmmmmmmmmmmmmmmmmmmmmmmmmmmm��m� mmm�mmmomom��mmmm�m®mmmmmmmmmmm��m� INLETSOFT RY ENSOFTEC DATE:Vl1 U21 Starbucks STORM STORM SEWER DESIGN COMPUTATIONS STORM FREQUENCY 10 PROJECT: Starbucks LOCATION: 2231 Seminole Ln COUNTY: Albemarle Designed by: A. Fontaine Checked by: C. Kotamki UNITS ENGLISN PIPE NO FROM POMT TO POINT DRAIN. AREA "A" Acre (3) RUNOFF COEFF, "C" (4) CA TOTAL INLET TIME Minutes (]) RAM FALL RUf3r (8) RUNOFF Q CPS (9) INVERTELEVATIONS LENGTH of Pipe Ft (12) SLOPE Ft/Ft. (13) SIZE (Dia. Or SpaNRise) In. (14) SHAPE Capacity CPS (15) Fnclion Slope FL/Ft VEL V. PUS. (16) FLAW UME Min (17) REMARKS (I8) INCRE-ACCUM- MENT (5) ULATED (6) ADDTL CA UPPER END (10) LOWER END (11) REFERENCE (1) STA. REFERENCE (2) STA. 119 120 118 0.186 0300 0056 0056 0000 6000 6230 035 424.335 423.586 36654 0020 1200E Circular 552 0000 3929 0.155 117 IS 116 0039 0800 0030 0086 0000 6.155 6.195 053 423490 423.313 8.840 0020 1200E CiroWar 546 0000 4.422 0033 115 116 114 0015 0560 0008 0095 0000 6.199 6.195 059 423210 422.895 15739 0020 1200E CiroWar 546 0000 4.542 0058 113 1N 112 0000 O.OW 0000 0095 0000 6267 6.159 058 622.80E 422.370 21.515 0020 1200E CiroWar 546 0000 4.538 0079 111 112 110 0017 0.670 0-011 OJ 06 000E 6326 6136 OLS 62229E 422092 8-889 0-020 1200E CiroWar 546 0000 44686 0032 121 122 110 0020 0.58E 0012 0012 000E 000E 8901 0.1E 623839 422.55E 6d.]M 002E 1200E CiroWar 541 000E 2718 0.398 109 110 108 000E 000E 000E 0.118 000E 6357 6.127 OR 62182E 42104E 38.876 002E 1200E Circular 547 000E 4.832 0.134 IN 108 UGDI 0245 0.6]0 0164 0282 0000 6491 6-099 191 420940 420700 12746 0-019 1200E CiroWar 529 0002 6031 0-035 103 UGD2 102 0000 0000 0000 0.361 0361 6000 6230 225 61800E 417600 12.541 1 0032 1 15000 Cimulawl 1249 1 0001 1 2232 10027 101 102 EX-IOO 0050 0740 0039 0.398 0000 6029 6222 248 417 500 41].100 20287 1 002E 1 1500E 1 CiroWar 1 982 1 0001 66M 0051 StmPoucks STORM PROJECT: Slarhucks DESIGNED BY: A Fontaine HYDRAULIC GRADE LINE ANALYSIS Checked: C. Kolarski INCIDENCE PROBABILITY 10 Year INLET OR JUNCTION INLET STATION OUTLET WATER SURFACE EIEV. DIA PIPE Do (In) DESIGN DISCH. Go (CFS) LENGTH PIPE Lo (ED FRICTION SLOPE, SW (FT/m FRICTION LOSS Hf (ED JUNCTION LOSS FINAL H (Ft) It Waled SuU E1.11. RM Ek fonni¢nb V. Ho (Ft) OI N OM M-2a, HI Ante HA HI 13 HI S5 HI 108 422.] 12 1.72 12.75 0.20% 0.03 6.03 0.14 0.72 4.83 3.48 0.36 0.13 90.2 0.25 0.52 0.68 FALSE 0.7 423.47 427.05 OK -3.58 110 423.47 12 0.72 38.88 0.03% 0.01 4.83 0.09 0.65 4.69 3.05 0.34 0.12 55.43 0.19 0.4 0 FALSE 0.41 423.89 427.93 OK 4.04 112 423.89 12 0.65 8.89 0.03% 0 4.69 0.09 0.58 4.54 2.64 0.32 0.11 52.18 0.16 0.36 0 FALSE 0.36 424.25 427.99 OK -3.74 114 424.25 12 0.58 21.52 0.02% 0 4.54 0.08 0.58 4.54 2.65 0.32 0.11 69.51 0.2 0.39 0 FALSE 0.39 424.64 428.54 OK -3.9 116 424.64 12 0.58 15.74 0.02% 0 4.54 0.08 0.53 4.42 2.36 0.3 0.11 67.31 0.19 0.37 0 FALSE 0.38 425.02 427.83 OK -2.81 118 425.02 12 0.53 8.84 0.02% 0 4.42 0.08 0.35 3.93 1.37 0.24 0.08 61.46 0.13 0.29 0.38 FALSE 0.38 425.4 428.33 OK -2.93 120 425.4 12 0.35 36.65 0.01% 0 3.93 0.06 0 0 0 0 0 0 0 0.06 0.08 FALSE 0.08 425.48 429.35 OK -3.87 122 423.89 12 0.1 64.7 0.00% 0 2.71 0.03 0 0 0 0 0 0 0 0.03 0.04 FALSE 0.D4 423.93 430.1 OK 102 418.1 15 2.48 20.29 0.13% 0.03 6.68 0.17 2.25 ].]3 17.39 0.93 0.32 34.84 0.32 0.82 0 FALSE 0.85 418.95 425.78 OK -6.83 UGD2 418.95 15 2.25 12.54 0.10% 0.01 ].]3 0.23 0 0 0 0 0 0 0 0.23 0 FALSE 0.25 419.19 419.46 OK -0.26 1S 2S PRE AR t 1 A PRE AREA 1 B 1L 3S AP1 PRE AREA 1C 4S PRE AREA 2A 2L AP2 i5S PRE AREA 2B OSubcat Reach On Link Routing Diagram for 47165 PRE ❑ Prepared by Timmons Group, Printed 6/9/2021 HydroCADO 10.10-4a s/n 08663 O 2020 HydroCAD Software Solutions LLC 47165 PRE Prepared by Timmons Group Printed 6/9/2021 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 0.589 61 >75% Grass cover, Good, HSG B (1 S, 2S, 3S, 4S, 5S) 0.133 80 >75% Grass cover, Good, HSG D (4S, 5S) 0.565 98 Paved parking, HSG D (1S, 3S, 4S, 5S) 1.287 79 TOTAL AREA 47165 PRE Prepared by Timmons Group Printed 6/9/2021 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 0.589 HSG B 1S, 2S, 3S, 4S, 5S 0.000 HSG C 0.698 HSG D 1S, 3S, 4S, 5S 0.000 Other 1.287 TOTAL AREA 47165 PRE Prepared by Timmons Printed 6/9/2021 Ground Covers (all nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 0.589 0.000 0.133 0.000 0.722 >75% Grass cover, Good 1 S, 2S, 3S, 4S, 5S 0.000 0.000 0.000 0.565 0.000 0.565 Paved parking 1S, 3S, 4S, 5S 0.000 0.589 0.000 0.698 0.000 1.287 TOTAL AREA 47165 PRE Type 11 24-hr 10 YR Rainfall=5.50" Prepared by Timmons Group Printed 6/9/2021 HydroCADO 10.10-4a s/n 08663 © 2020 HydroCAD Software Solutions LLC Page 5 Time span=0.00-30.00 hrs, dt=0.03 hrs, 1001 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 AREA1A Runoff Area=0.303ac 90.10%Impervious Runoff Depth=4.80" Tc=6.0 min CN=94 Runoff=2.29 cfs 0.121 of Subcatchment2S: PRE AREA113 Runoff Area=0.200 ac 0.00% Impervious Runoff Depth=1.68" Tc=6.0 min CN=61 Runoff=0.59 cfs 0.028 of Subcatchment3S: PRE AREA1C Runoff Area=0.214 ac 41.12% Impervious Runoff Depth=2.95" Tc=6.0 min CN=76 Runoff=1.12 cfs 0.053 of Subcatchment4S: PRE AREA2A Runoff Area=0.282 ac 50.35% Impervious Runoff Depth=3.63" Tc=6.0 min CN=83 Runoff=1.76 cfs 0.085 of Subcatchment5S: PRE AREA213 Runoff Area=0.288 ac 21.53% Impervious Runoff Depth=2.77" Tc=6.0 min CN=74 Runoff=1.41 cfs 0.066 of Link 1 L: AN Inflow=3.99 cfs 0.202 of Primary=3.99 cfs 0.202 of Link 2L: AP2 Inflow=3.18 cfs 0.152 of Primary=3.18 cfs 0.152 of Total Runoff Area = 1.287 ac Runoff Volume = 0.354 of Average Runoff Depth = 3.30" 56.10% Pervious = 0.722 ac 43.90% Impervious = 0.565 ac 47165 PRE Prepared by Timmons Type 11 24-hr 10 YR Rainfall=5.50" Printed 6/9/2021 Summary for Subcatchment 1S: PRE AREA 1A Runoff = 2.29 cfs @ 11.97 hrs, Volume= 0.121 af, Depth= 4.80" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.03 hrs Type II 24-hr 10 YR Rainfall=5.50" Area (ac) CN Description 0.273 98 Paved parking, HSG D 0.030 61 >75% Grass cover, Good, HSG B 0.303 94 Weighted Average 0.030 9.90% Pervious Area 0.273 90.10% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 1S: PRE AREA 1A Hydrograph ❑ Runoff 2.2s cfs Type II 24-hr 2 10 YR Rainfall=5.50" Runoff Area=0.303 ac Runoff Volume=0.121 of Runoff Depth=4.80" o Tc=6.0 min CN=94 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) 47165 PRE Timmons Type 11 24-hr 10 YR Rainfall=5.50" Printed 6/9/2021 Summary for Subcatchment 2S: PRE AREA 1 B Runoff = 0.59 cfs @ 11.98 hrs, Volume= 0.028 af, Depth= 1.68" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.03 hrs Type II 24-hr 10 YR Rainfall=5.50" Area (ac) CN Description 0.200 61 >75% Grass cover, Good, HSG B 0.000 98 Paved parking, HSG D 0.200 61 Weighted Average 0.200 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (f /I (f /sec) (cfs) 6.0 Direct Entry, Subcatchment 2S: PRE AREA 1 B Hydrograph 0.65 0.6 0.59 CI i 0.55 0.5 0.45 0.4 - - 2 0.35 0 0.3 � I I I I I I I I I I I --------------------------------- 0.25 0.2 0.15 -------------------------------- 0.1 0.05 �lYpe 1_2,44hr_ r 'r 10-Y-R-Rainfaill :5-5i01"- Runoff-A -1` 14-20'01a Runoff ! okhfi 0.-028' of Runoff De pth=1.68" ----------------------------------------------------- 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 25 26 27 28 29 30 Time (hours) ■ Runoff 47165 PRE Prepared by Timmons Type 11 24-hr 10 YR Rainfall=5.50" Printed 6/9/2021 Summary for Subcatchment 3S: PRE AREA 1 C Runoff = 1.12 cfs @ 11.97 hrs, Volume= 0.053 af, Depth= 2.95" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.03 hrs Type II 24-hr 10 YR Rainfall=5.50" Area (ac) CN Description 0.126 61 >75% Grass cover, Good, HSG B 0.088 98 Paved parking, HSG D 0.214 76 Weighted Average 0.126 58.88% Pervious Area 0.088 41.12% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 3S: PRE AREA 1 C Hydrograph ❑ Runoff 1.12 cfs Type II 24-hr 10 YR Rainfall=5.50" Runoff Area=0.214 ac Runoff Volume=0.053 of Runoff Depth=2.95" Tc=6.0 m i n CN=76 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) 47165 PRE Prepared by Timmons Type 11 24-hr 10 YR Rainfall=5.50" Printed 6/9/2021 Summary for Subcatchment 4S: PRE AREA 2A Runoff = 1.76 cfs @ 11.97 hrs, Volume= 0.085 af, Depth= 3.63" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.03 hrs Type II 24-hr 10 YR Rainfall=5.50" Area (ac) CN Description 0.087 61 >75% Grass cover, Good, HSG B 0.142 98 Paved parking, HSG D 0.053 80 >75% Grass cover, Good, HSG D 0.282 83 Weighted Average 0.140 49.65% Pervious Area 0.142 50.35% Impervious Area Tc Length Slope Velocity Capacity Description • 1 3 0 M Direct Entry, Subcatchment 4S: PRE AREA 2A Hydrograph Type II 24-hr 10 YR Rainfall=5.50" Runoff Area=0.282 ac Runoff Volume=0.085 of Runoff Depth=3.63" Tc=6.0 m i n CN=83 1 1 21 22 23 24 25 26 27 28 29 311 ❑ Runoff 47165 PRE Prepared by Timmons Type 11 24-hr 10 YR Rainfall=5.50" Printed 6/9/2021 Summary for Subcatchment 5S: PRE AREA 2B Runoff = 1.41 cfs @ 11.97 hrs, Volume= 0.066 af, Depth= 2.77" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.03 hrs Type II 24-hr 10 YR Rainfall=5.50" Area (ac) CN Description 0.062 98 Paved parking, HSG D 0.080 80 >75% Grass cover, Good, HSG D 0.146 61 >75% Grass cover, Good, HSG B 0.288 74 Weighted Average 0.226 78.47% Pervious Area 0.062 21.53% Impervious Area Tc Length Slope Velocity Capacity Description N 3 0 M Direct Entry, Subcatchment 5S: PRE AREA 2B Hydrograph 1.41 cfs Type II 24-hr 10 YR Rainfall=5.50" Runoff Area=0.288 ac Runoff Volume=0.066 of Runoff Depth=2.77" Tc=6.0 m i n CN=74 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) ❑ Runoff 47165 PRE Prepared by Timmons Type 11 24-hr 10 YR Rainfall=5.50" Printed 6/9/2021 Summary for Link 1 L: AP1 Inflow Area = 0.717 ac, 50.35% Impervious, Inflow Depth = 3.38" for 10 YR event Inflow = 3.99 cfs @ 11.97 hrs, Volume= 0.202 of Primary = 3.99 cfs @ 11.97 hrs, Volume= 0.202 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-30.00 hrs, dt= 0.03 hrs Link 1L: AP1 Hydrograph ❑ Inflow ❑ Primary 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) 47165 PRE Prepared by Timmons Type 11 24-hr 10 YR Rainfall=5.50" Printed 6/9/2021 Summary for Link 2L: AP2 Inflow Area = 0.570 ac, 35.79% Impervious, Inflow Depth = 3.19" for 10 YR event Inflow = 3.18 cfs @ 11.97 hrs, Volume= 0.152 of Primary = 3.18 cfs @ 11.97 hrs, Volume= 0.152 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-30.00 hrs, dt= 0.03 hrs a w u 3 0 M Link 2L: AP2 Hydrograph 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 25 26 27 28 29 30 Time (hours) ❑ Inflow ❑ Primary 1S POST AREA 1 A 1P 2S SWM A Iael _ C _ I:1 (3S POST AREA 1 C POST AREA (4S POST AREA 1 D 2L (6S AP2 POST AREA 2B OSubcat Reach on Link ❑ 1L MWTITMJM 47165 POST Prepared by Timmons Printed 6/9/2021 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 0.020 69 50-75% Grass cover, Fair, HSG B (5S) 0.578 61 >75% Grass cover, Good, HSG B (1 S, 2S, 3S, 4S, 6S) 0.107 80 >75% Grass cover, Good, HSG D (5S, 6S) 0.581 98 Paved parking, HSG D (1S, 3S, 4S, 5S, 6S) 1.286 79 TOTAL AREA 47165 POST Prepared by Timmons Printed 6/9/2021 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 0.598 HSG B 1S, 2S, 3S, 4S, 5S, 6S 0.000 HSG C 0.688 HSG D 1S, 3S, 4S, 5S, 6S 0.000 Other 1.286 TOTAL AREA 47165 POST Prepared by Timmons Printed 6/9/2021 Ground Covers (all nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 0.020 0.000 0.000 0.000 0.020 50-75% Grass cover, Fair 5S 0.000 0.578 0.000 0.107 0.000 0.685 >75% Grass cover, Good 1 S, 2S, 3S, 4S, 5S, 6S 0.000 0.000 0.000 0.581 0.000 0.581 Paved parking 1S, 3S, 4S, 5S, 6S 0.000 0.598 0.000 0.688 0.000 1.286 TOTAL AREA 47165 POST Prepared by Timmons Printed 6/9/2021 Pipe Listing (all nodes) Line# Node In -Invert Out -Invert Length Slope n Diam/VVidth Height Inside -Fill Number (feet) (feet) (feet) (ft/ft) (inches) (inches) (inches) 1 1 P 418.00 417.66 9.7 0.0351 0.013 15.0 0.0 0.0 47165 POST Type 11 24-hr 10 YR Rainfall=5.50" Prepared by Timmons Group Printed 6/9/2021 HydroCAD®10.10-4a s/n 08663 ©2020 HydroCAD Software Solutions LLC Page 6 Time span=0.00-30.00 hrs, dt=0.03 hrs, 1001 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: POSTAREA1A Runoff Area=0.329 ac 75.08% Impervious Runoff Depth=4.25" Tc=6.0 min CN=89 Runoff=2.32 cfs 0.117 of Subcatchment2S: POSTAREA113 Runoff Area=0.231 ac 0.00%Impervious Runoff Depth=1.68" Tc=6.0 min CN=61 Runoff=0.68 cfs 0.032 of Subcatchment3S:POSTAREA1C Runoff Area=0.214ac 41.12%Impervious Runoff Depth=2.95" Tc=6.0 min CN=76 Runoff=1.12 cfs 0.053 of Subcatchment4S:POSTAREA1D Runoff Area=0.088ac 71.59%Impervious Runoff Depth=4.04" Tc=6.0 min CN=87 Runoff=0.60 cfs 0.030 of Subcatchment5S: POSTAREA2A Runoff Area=0.167 ac 71.86% Impervious Runoff Depth=4.58" Tc=6.0 min CN=92 Runoff=1.23 cfs 0.064 of Subcatchment6S: POSTAREA26 Runoff Area=0.257 ac 24.51% Impervious Runoff Depth=2.95" Tc=6.0 min CN=76 Runoff=1.34 cfs 0.063 of Pond 1 P: SWM A Peak Elev=422.77' Storage=0.015 of Inflow=2.99 cfs 0.149 of Outflow=2.25 cfs 0.149 of Link 1 L: AN Inflow=3.79 cfs 0.231 of Primary=3.79 cfs 0.231 of Link 2L: AP2 Inflow=2.57 cfs 0.127 of Primary=2.57 cfs 0.127 of Total Runoff Area = 1.286 ac Runoff Volume = 0.358 of Average Runoff Depth = 3.34" 54.82% Pervious = 0.705 ac 45.18% Impervious = 0.581 ac 47165 POST Prepared by Timmons Type 11 24-hr 10 YR Rainfall=5.50" Printed 6/9/2021 Summary for Subcatchment 1S: POST AREA 1A Runoff = 2.32 cfs @ 11.97 hrs, Volume= 0.117 af, Depth= 4.25" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.03 hrs Type II 24-hr 10 YR Rainfall=5.50" Area (ac) CN Description 0.247 98 Paved parking, HSG D 0.082 61 >75% Grass cover, Good, HSG B 0.329 89 Weighted Average 0.082 24.92% Pervious Area 0.247 75.08% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 1S: POST AREA 1A Hydrograph ❑ Runoff 2.32 cfs Type II 24-hr 2 10 YR Rainfall=5.50" Runoff Area=0.329 ac Runoff Volume=0.117 of Runoff Depth=4.25" Tc=6.0 m i n CN=89 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) 47165 POST Type 1124-hr 10 YR Rainfall=5.50" Prepared by Timmons Group Printed 6/9/2021 Summary for Subcatchment 2S: POST AREA 1 B Runoff = 0.68 cfs @ 11.98 hrs, Volume= 0.032 af, Depth= 1.68" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.03 hrs Type II 24-hr 10 YR Rainfall=5.50" Area (ac) CN Description 0.231 61 >75% Grass cover, Good, HSG B 0.000 98 Paved parking, HSG D 0.231 61 Weighted Average 0.231 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 2S: POST AREA 1 B 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 0.75 I I I I I 0.7 0.65 IYpE I�I 21?hr IIIIIIIIII IIIIIIIIII os 1.0_YR_RainifellItS.50"- J 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 0.55 ' Run4tf-Areal=0.23ae ___r__r__r _ Y I I I I I I I I I I I I I I I I I I I I I I I I I I I 0.5 J--L--L--L --L--L--L--L--J--J- 'Rlur' offLVibllurhr fi.'0 of 0.45 I I I I I I I I I I I I I I _ _ I I I I I I I I I I 0.4 Faun©ff [fie-i _thT1J11-68"3 o 0.35 T I r__r__r__r_ 7 T ,1 0.3 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 y 0.25 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 I I I I 0 2 I I I I I --L--L--L--L--L--1--1--1--J--J-- _-I---I---L--L--L--L--L--L--L--1--1--1--1--J__J__J___I-- 0.15 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 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 I I I I I --L--L--L--L--L--1--1--1--J--J-- i---L--L--L--L--L--L--L--1--1--1--1--J--J--J---I-- n 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 25 26 27 28 29 30 Time (hours) ■ Runoff 47165 POST Prepared by Timmons Type 11 24-hr 10 YR Rainfall=5.50" Printed 6/9/2021 Summary for Subcatchment 3S: POST AREA 1C Runoff = 1.12 cfs @ 11.97 hrs, Volume= 0.053 af, Depth= 2.95" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.03 hrs Type II 24-hr 10 YR Rainfall=5.50" Area (ac) CN Description 0.126 61 >75% Grass cover, Good, HSG B 0.088 98 Paved parking, HSG D 0.214 76 Weighted Average 0.126 58.88% Pervious Area 0.088 41.12% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 3S: POST AREA 1 C Hydrograph ❑ Runoff 1.12 cfs Type II 24-hr 10 YR Rainfall=5.50" Runoff Area=0.214 ac Runoff Volume=0.053 of Runoff Depth=2.95" Tc=6.0 m i n CN=76 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) 47165 POST Type 11 24-hr 10 YR Rainfall=5.50" Prepared by Timmons Group Printed 6/9/2021 Summary for Subcatchment 4S: POST AREA 1 D Runoff = 0.60 cfs @ 11.97 hrs, Volume= 0.030 af, Depth= 4.04" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.03 hrs Type II 24-hr 10 YR Rainfall=5.50" Area (ac) CN Description 0.025 61 >75% Grass cover, Good, HSG B 0.063 98 Paved parking, HSG D 0.088 87 Weighted Average 0.025 28.41 % Pervious Area 0.063 71.59% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 4S: POST AREA 1 D Hydrograph L--L--L--L--L--'--'--'--L--L--L---'---'---'---�--�--�--�--L--L--L--�--�--�--'--�--�--�--'-- 0.65 0.60 CF& J J J pxP611214�h r 0.5 ---;-- ---; -- -Runoff-AT64=b:b81S 'ad- 0.45 t t 4 0.4 R�ur�of �/p11urY�Q.O30 af- 0.35 Ftun©ff- 66th'-4-04'''�` C 0.3 r 0.25 CN :87 0.2 --r--r--r--r--r-------------------�---�---r--r--r--r--r--r--r--,--,--,--,--,--,--,---�-- 0.1 0.05 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) ■ Runoff 47165 POST Prepared by Timmons Type 11 24-hr 10 YR Rainfall=5.50" Printed 6/9/2021 Summary for Subcatchment 5S: POST AREA 2A Runoff = 1.23 cfs @ 11.97 hrs, Volume= 0.064 af, Depth= 4.58" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.03 hrs Type II 24-hr 10 YR Rainfall=5.50" Area (ac) CN Description 0.120 98 Paved parking, HSG D 0.027 80 >75% Grass cover, Good, HSG D 0.020 69 50-75% Grass cover, Fair, HSG B 0.167 92 Weighted Average 0.047 28.14% Pervious Area 0.120 71.86% Impervious Area Tc Length Slope Velocity Capacity Description 3 0 M Direct Entry, Subcatchment 5S: POST AREA 2A Hydrograph 123 ds IIIIIIIIII Type II 24-hr 10 YR Rainfall=5.50" Runoff Area=0.167 ac Runoff Volume=0.064 of Runoff Depth=4.58" Tc=6.0 m i n CN=92 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) ❑ Runoff 47165 POST Prepared by Timmons Type 11 24-hr 10 YR Rainfall=5.50" Printed 6/9/2021 Summary for Subcatchment 6S: POST AREA 2B Runoff = 1.34 cfs @ 11.97 hrs, Volume= 0.063 af, Depth= 2.95" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.03 hrs Type II 24-hr 10 YR Rainfall=5.50" Area (ac) CN Description 0.063 98 Paved parking, HSG D 0.080 80 >75% Grass cover, Good, HSG D 0.114 61 >75% Grass cover, Good, HSG B 0.257 76 Weighted Average 0.194 75.49% Pervious Area 0.063 24.51 % Impervious Area Tc Length Slope Velocity Capacity Description i-\ If--+% /f1/f1\ 141--- N /.do\ 6.0 Direct Entry, Subcatchment 6S: POST AREA 2B Hydrograph 1.34 ds Type II 24-hr 10 YR Rainfall=5.50" Runoff Area=0.257 ac 1 Runoff Volume=0.063 of Runoff Depth=2.95" Tc=6.0 m i n CN=76 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) ❑ Runoff 47165 POST Prepared by Timmons Type 11 24-hr 10 YR Rainfall=5.50" Printed 6/9/2021 Summary for Pond 1 P: SWM A Inflow Area = 0.560 ac, 44.11 % Impervious, Inflow Depth = 3.19" for 10 YR event Inflow = 2.99 cfs @ 11.97 hrs, Volume= 0.149 of Outflow = 2.25 cfs @ 12.03 hrs, Volume= 0.149 af, Atten= 25%, Lag= 3.5 min Primary = 2.25 cfs @ 12.03 hrs, Volume= 0.149 of Routing by Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.03 hrs Peak Elev= 422.77' @ 12.03 hrs Surf.Area= 0.003 ac Storage= 0.015 of Plug -Flow detention time=2.5 min calculated for 0.149 of (100% of inflow) Center -of -Mass det. time= 2.5 min ( 806.5 - 804.1 ) Volume Invert Avail.Storage Storage Description #1 418.00' 0.016 of 66.0" Round Pipe Storage L= 30.0' Device Routing Invert Outlet Devices #1 Primary 418.00' 15.0" Round Culvert L= 9.7' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 418.00' / 417.66' S= 0.0351 T Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.23 sf #2 Device 1 418.00' 5.5" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 1 419.64' 3.5" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 422.77' 3.7' long Sharp -Crested Rectangular Weir2 End Contraction(s) Primary OutFlow Max=2.24 cfs @ 12.03 hrs HW=422.75' (Free Discharge) t1=Culvert (Passes 2.24 cfs of 9.48 cfs potential flow) 2=Orifice/Grate (Orifice Controls 1.69 cfs @ 10.24 fps) 3=Orifice/Grate (Orifice Controls 0.55 cfs @ 8.30 fps) =Sharp -Crested Rectangular Weir( Controls 0.00 cfs) Pond 1 P: SWM A Hydrograph ❑ Inflow ❑ Primary Time (hours) 47165 POST Prepared by Timmons Type 11 24-hr 10 YR Rainfall=5.50" Printed 6/9/2021 Summary for Link 1 L: AP1 Inflow Area = 0.862 ac, 46.17% Impervious, Inflow Depth = 3.22" for 10 YR event Inflow = 3.79 cfs @ 11.99 hrs, Volume= 0.231 of Primary = 3.79 cfs @ 11.99 hrs, Volume= 0.231 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-30.00 hrs, dt= 0.03 hrs a w u 3 0 M Link 1L: AP1 Hydrograph 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 25 26 27 28 29 30 Time (hours) ❑ Inflow ❑ Primary 47165 POST Prepared by Timmons Type 11 24-hr 10 YR Rainfall=5.50" Printed 6/9/2021 Summary for Link 2L: AP2 Inflow Area = 0.424 ac, 43.16% Impervious, Inflow Depth = 3.59" for 10 YR event Inflow = 2.57 cfs @ 11.97 hrs, Volume= 0.127 of Primary = 2.57 cfs @ 11.97 hrs, Volume= 0.127 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-30.00 hrs, dt= 0.03 hrs a w u 3 0 M Link 2L: AP2 Hydrograph 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 25 26 27 28 29 30 Time (hours) ❑ Inflow ❑ Primary NOAA Atlas 14, Volume 2, Version 3 Location name: Charlottesville, Virginia, USA* Latitude: 3levati °, : 435.4utle:-78.4641° Elevation: fl" } ESRI Me,. sau : USGS POINT PRECIPITATION FREQUENCY ESTIMATES G.M. gamin, O. Marlin, B. Lin, T. Parzybok, M.Yekta, and D. Fill, NOM, National weather Servica, Silver Spring, Maryland PF tabular I PF graphical I Maps & aerials PF tabular PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1 Average recurrence interval (years) Duration 000 10 251 50-rrl 100 200 500 1000 0.351 0.419 0.492 0.554 0.623 0.678 0.729 0.778 0.838 0.886 5-min (0.317-0.390) (0.379-0.465) (0.443-0.545) (0.497-0.612) (0.558-0.688) (0.604-0.747) (0.646-0.804) (0.684-0.858) (0.72a-0.26) (0.764-0S82) 133 10-min 0.506-0.622 0.8 5-0]44 0.70f0-0872 0.795-09]9 0.889--11..10 0.962-18.19 1.03-1128 1.09-2130 : 15-IA6 1.2041055 15-Into 0.701 0.843 0.997 1.12 1.26 1.37 F1AT 1.56 1.67 1.75 (0.633-0.778) (0.761-0.935) (0.898-1.10) 1 (1.01-1.24) 1 (1.13-1.39) 1 (1.22-1.51) 1 (1.30-1.61) 1 (1.37-1.72) 1 1 (1.51-1.94) 206 30-min 0.8684207 1.05-1L29 1.28-1.57 1,464279 1.67-2?D6 1.83-2.27 1. 9�4] 2. 3220 2.31-22..93 2.44-94.14 60-min F60 n (1.08-2123 1.32-�62 1.64-2.01) 1. 0-12.34 2.2�74 2:9-3.08 2.]43g41 2.9430.75 3.314.21 3.57-4.59 2-hr 1A4 F 1.75 F 2.19 F 2.58 F 3.07 F 3.48 F 3.91 F 4.36 F 4.98 5.51 (1.27-1.64) 1 (1.54-1.9) 1 (1.98-2.49) 1 (2.27-2.91) (2.693.47) (3.08-3.94) 1 (3.384.41) 1 (3144.91) 1 (4.23-5.62) 1 (4.63-6.24) 3-hf 1.391.81 1.68319 2: 0-2.75 2. 5321 2.913.82 3.293.33 3.67480 4.0 5.44 4.606.23 5.0s-6.91 2.01 2.43 3.02 3.55 4.27 4.90 5.56 6.27 7.30 8.19 6 hr (1.78-2.28) 1 (2.152.76) 1 (2.66-3.42) 1 (3.114.02) (3.72-4.83) (4.24-5.52) 1 (4.76-6.27) (5.32-7.08) (6.10-8.24) (6.75-9.27) 2.52 3.04 3.30 4.49 5.46 6.33 ].27 8.31 984711.2 12-hr 223-289 269-348( 334434) 394-512 (475-621) 1 (545-719) 618-825 (697-941) (810-112) 1 (909-128 7244v 2441r 2.]0338 3.27-009 4: 6-5.22 4.91 8016 5.98-]554 8898872 .8]-010.0 8.910- 1.5 10.4- 3.8 1 ] 1415 3.55 7F 4.30 7 5.47 7F 6.43 7F 7.82 7899 7710.3 7F11.6 73677537 2-tlay (3.19-3.97) 11 (387-4.81) 1 (4.90-810) (5.75-7.17) 11 (894-8.70) 1 (7.92-998) 1 (8.9611.4) 11 (101-12.9) 1 (11.7-152) 1 (13.0-171) 62 3•day (3.434F378 . 34819 4. 55.07 5.2 344 6.68.58 7.469.1] 8.51- 0.5 9.6312.0 10.8-3.8 12.58.0 13.19- 8.0 4.01 4.86 6.18 7.24 8.80 10.1 11.5 13.0 15.2 17.1 4-tlay (3.674.42) (4.445.34) (5.638.78) 1 (6.60-7.95) (7.98-9.65) (9.11-11.1) 1 (10.3-12A) (11.6-14.3) (13.4-16.8) (14.9-18S) 7-deY 4.2 5609 5. 5-6.13 6. 2]'67 .38692 8. 2-810.] 10.1' 2.2 114-13.8 1274--15.6 14.5-18.1 16.10- 0.2 10-13.1 74 10day 4.875973 5. 58.88 7. 1I 8. 0 9419 9.83- 1.8 11.84 12.13-14.] 13.18--16.4 15.14- 8.9 16.1g- 0.9 6.94 8.28 10.00 11.4 13.2 14.6 16.1 17.6 19.6 21.2 20day (6.49-7.44) 1 (7758.88) (9.34-10.7) 1 (10.6-12.2) 1 (12.3-14.1) 1 (13.5-15.7) 1 (14.9-1].3) 1 (16.2-18.9) 1 (179-21.2) 1 (19.2-230) 30daY 8,01 9,08 9.49-10.8 112-12.7 125-14.2 142-16.2 15.4-7.6 16.17- 9.1 17.19- 0.5 194-22.5 20.5- 3.9 10.6 12.6 14.7 16.3 18.3 19.8 21.2 22.6 24.4 25.8 day 10.0-11.3 (11.8-13.3) 13.8-15.5) 1 (15.3-17.2) 1 (17.2-19.4) 1 (18.6-21.0) 1 (19.9-22.5) 1 (21.1-24.0) 22.7-0.0) 1 (23.8-27.5) 12.5 14.7 16.9 18.6 20.8 22.4 23.9 25.3 27.1 28.5 60day 11.8-13.2 13.9-15.5 16.A17.9 17.E-19.7 19.E-21.9 21.1-23.6 2.4-25.2 23.7-26.8 L2iL288LJ 26.5-30.2 1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS). Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater then the upper bound (or less than the lower bound) Is 5%. Estimates at upper bounds ere not chill against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values. Please refer to NOAA Atlas 14 document for more information. Back to Top PF graphical PDS-based depth -duration -frequency (DDF) curves Latitude: 38-0964', Longitude:-78.4641' 25 L 20 1 W v 0 15 n WG 10 E 2 c t r n w a 5 0 —� C C C C C T T T T T T T T T L L L L L ry g q ry q q ry qry A6AE E A �b A r d ri o a s u9. 9 Ourabon Average recurrence interval (years) NOAA Atlas 14, Volume 2, Version 3 Created (GMT): Tue Dec 816:53:24 2020 Back to Top Maps & aerials Small scale terrain _ !n •!A!BE RA9!E i� S-",3 Aa=oer - F%F 7 d 9. P 2 Westmoreland 3er i II 2.1 Large scale terrain In1arvW (ytura) 2 5 10 — 25 — 50 — 100 200 Soo 1000 Duration — "in — 2-cay — tamin — 3-day 15mm — "ay — 30min — 7-cay — 6".n — 10-day — 2-fir — 20-day — 3-f,r — 30-day — 0-hr — 45-day — 12-hr — 60-day — 24-hr t \ \ Washington, D.C� �An Ha .,.nburg . Staunron' —VIRGINIA A Rich{� � -Lynchburg 't �U 100km � 60mi � Large scale map 'i,�6altin 4;3 Anr WasD r: � �.� Hanlsaiburg �...�.v n amla Chmon oLynchburp M,rcW,urg Roanoke 00km 65mi Noriol Backto Top US DD@uatlment of Cammerce National Oceanic and Atmospheric Administration National Weather Service National Water Center 1325 East West Highway Silyer Spring, MD 20910 Questions?: HDSC.Questions�_noaa.gov Disclaimer DEq Virginia Runoff Reduction Method Re -Development Compliance Spreadsheet -Version 3.0 02011 BMP Standards and Specifications 112013 Draft BMP Standards and Specifications �r- Project Name: STARBUCK52231 SEMINOLE LN ® data Input cells Date: TUNE 15, 2021 Constant values Linear Development Project? No calculitlAn cells Site Information Post -Development Project (Treatment Volume and Loads) Enter Total Disturbed Area (acres) 0.59 Check: BMP Design S c' ications List: 2011 St & Specs I it Linear project? No F F Land cover areas entered correctly? R� F r® Total disturbed area entered? t� Pre-ReDevelopment Land Cover (acres) 7Soils7D5 A SOi15 BSOIIs Totals Forest/Open Space (acres) -- undisturbed 0.00 forest/open space Managed Turf(acres)-- disturbed, graletl for O.11 yams or other turf to be mowed/managed 0.12 0.05 Impervious Cover(acres) 0.37 0.05 0.42 0.59 Post -Development Land Cover (acres) A Soils BSoils CSO& Dsoils Totab Forest/Open Space (acres) -- undisturbed, 0.00 s protected forest/openor refarestetl land Managed Turf (acres) disturbed, gra le l for 0.15 yards or other turf to be mowetl/mana ed 0.13 0.03 Impervious Cover(acres) 037 0.07 0'49 Area Check OK. OK. OIL OK. 0.59 Constants Runoff Coefficients Rv Annual Rainfall (inches) 43 ASoils 9soils CSoils Dsoils Target Rainfall Event (inches) 1.00 Forest/Open Space 0.02 0.03 0.00 0.05 Total Phosphorus (TP) EMC(mg/L) 0.26 Managetl Turf 0.15 0.20 0.22 0.25 Total Nitrogen (TN) EMC pn lQ in Impervious Cover 0.95 OAS 0.95 0.95 Target TP Load(lb/acre/yr) 0.41 Pj(unitless correction factor) 0.90 LAND COVER SUMMARY -- PRE -REDEVELOPMENT LAND COVER SUMMARY POST DEVELOPMENT Land Cover Summary -Pre lard Cover Summery-Post(Fiaal) Land Cover SmVdary-Poat Land Cover summary -Post Pre-ReDevelopment Listed Adjusted' Post ReDev.&Nero Impervious Dolt-ReDevelopment pervious Post -Development Impervious Forest/Open Space Cover (acres( 0.00 0.00 Forest/Open Space 0.00 Forest/0pen Space 0.00 Cover (acres) Cover (acres) Weighted Rv(forest) 0.00 am Weighted Rv(farest) 0.00 Weighted RV(foren) 0.00 %Forest 0% 0% %Forest 0% %Forest 0% F11 Managed Turf Cover (acres) 0.17 0.15 Managed Turf Cover 0.15 Managed TurfCover 0.15 (acres) (acres) Weighted Rv(tur0 0.22 0.21 Weighted Rv(turf) 0.21 Weighted Rv(turQ 0.21 %Managetl Turf 29% 27% %Managetl Turf 26% %Managed Turf 27% Impervious Cover (acres) 0.42 0A2 lan"iousC r 044 ReDev. Impervious 042 Newlmpemous Cover 0.01 (acres) Cover (acres) (acres) Rv(imperviaus) 0.95 0.95 Rv(imparvious) 0.95 Rv(impervious) 0.95 Rv(impervious) 0.95 %Impervious 73% 73% %Impervious 74% %Impervious 73% Total Site Area(acres) 0.59 0.5] Final Sde Area(acres) 0.59 TutAReDev.Ske Area 0.57 (acres) Site Rv 0.)4 0.75 Final Port Dev Shell 0.]6 ReOev SkeM 0.75 Treatment Volume and Nutrient Load Treatment Volume and Nutrient Load Past -Development Pre-ReDevelopment Treatment Volume Final Dose Development Post-ReDevelopment (one-k) 0.0364 0.0360 TreMmeM Volume 0.0373 Treatment Valume 0.0360 TrertmerAVolume 0.0013 (acre-k) (xre-k) (acre-ft) Post -Development Final Post- Post-ReDevelopment Pre-0.e0evelapmen[Treatment Volume 1,585 1,Sfi8 Development 1,626 Treatment Volume 1,568 Treatment Volume (cubic 59 (cubic feet) TreatmerRVolume (cubic feet) feet) (cubic feet) Dort -Development TD Pre-ReDevelopment TP Load Final Post- Port-ReDevelopment (lb/yr) 1.00 0.99 Development TP Load 1.02 Wad (TP) 0=9 Wad(lb/yr) 0.04 (Ib/Yr) Ob/sy)a Pre-ReDevelopment lP Wad per acre Final Port -Development TP Post-ReDevelupmen[lP (lb/acm/yQ 1.69 1.22 toad per acre 1.79 Wad per acre (lb/atm/yr) fib/acre/yr) Baseline TP Loatl (IVyr) Mai Reduction Required (0.41 lbs/acre/yr applied to prer Nevelopmem area excluding pervious 0.24 (aelow Pm ]elf land proposed for new impervious rover) ReDevelopment Loatl) 'Adjusted Land C'wer Summary: TP Wad Reduction TP Load Reduction Pre ReDea la meactland rover minus pervious land cover (J rest/open space or Required for 0.10 Required for New 0.03 staged corn aneagepcoposetlfornew impervious roves Redeveloped Area Impervious Area (lb/yr) (lb/yr) Adjusted rural acreage is consistent with Post-ReDevelopment acreage (minus acreage of new impervious cover). Column I shows food reduction requrfement for new impervious cover (based can new development food limit, 0.41 Rul croarar). Post -Development TP Load Reduction Required (Ib/yr) 0.13 Nitrogen Loads (Informational Purposes Only) Final Pon -Development TN Load Pre-ReDevelopment TN Wad(lb/yr) 7.12 (Post-ReDevelopment&New 7.31 Impervious) (lb/yr) Site Results (Water Quality Compliance) Area Checks D.A. A D.A. B D.A. C D.A. D D.A. E AREA CHECK FOREST/OPEN SPACE (ac) 0.00 0.00 0.00 0.00 0.00 OK. IMPERVIOUS COVER (ac) 0.00 0.00 0.00 0.00 0.00 OK. IMPERVIOUS COVER TREATED (ac) 0.00 0.00 0.00 0.00 0.00 OK. MANAGED TURF AREA (ac) 0.00 0.00 0.00 0.00 0.00 OK. MANAGED TURF AREA TREATED (ac) 0.00 0.00 0.00 0.00 0.00 OK. AREA CHECK OK. OK. OK. OK. OK. Site Treatment Volume (ft3) 1,626 Runoff Reduction Volume and TP By Drainage Area D.A. A D.A. B D.A. C D.A. D D.A. E TOTAL RUNOFF REDUCTION VOLUME ACHIEVED (ft) 0 0 0 0 0 0 TP LOAD AVAILABLE FOR REMOVAL (Ib/yr) D.00 0.00 0.00 0.00 0.00 0.00 TP LOAD REDUCTION ACHIEVED (Ib/yr) D.00 0.00 0.00 0.00 0.00 0.00 TP LOAD REMAINING (Ib/yr) 1 0.00 0.00 0.00L 0.00 NITROGEN LOAD REDUCTION ACHIEVED (Ib/yr) D.00 0.00 0.00 0.00 0.00 0.00 Total Phosphorus FINAL POST-DEVELOPMENTTP LOAD(Ib/yr) 1.02 TP LOAD REDUCTION REQUIRED (Ib/yr) 0.13 TP LOAD REDUCTION ACHIEVED (Ib/yr) 0.00 TP LOAD REMAINING (Ib/yr): 1.02 REMAINING TP LOAD REDUCTION REQUIRED (Ib/yr): 0.13 Total Nitrogen (For Information Purposes) POST -DEVELOPMENT LOAD(Ib/yr) 7.31 NITROGEN LOAD REDUCTION ACHIEVED (Ib/yr) 0.00 REMAINING POST -DEVELOPMENT NITROGEN LOAD (Ib/yr) 7.31