Revised Stormwater Management Report

15 0.10 0.09 0.08 0.07 0.06 0.06 0.05 0.05 0.05 0.04 0.04 0.04 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Time Precip. Excess (hours) (inches) (inches) 40.80 8.66 5.52 41.60 8.66 5.52 42.40 8.66 5.52 43.20 8.66 5.52 44.00 8.66 5.52 44.80 8.66 5.52 45.60 8.66 5.52 46.40 8.66 5.52 47.20 8.66 5.52 48.00 8.66 5.52 48.80 8.66 5.52 49.60 8.66 5.52 50.40 8.66 5.52 51.20 8.66 5.52 52.00 8.66 5.52 52.80 8.66 5.52 53.60 8.66 5.52 54.40 8.66 5.52 55.20 8.66 5.52 56.00 8.66 5.52 56.80 8.66 5.52 57.60 8.66 5.52 58.40 8.66 5.52 59.20 8.66 5.52 60.00 8.66 5.52 60.80 8.66 5.52 61.60 8.66 5.52 62.40 8.66 5.52 63.20 8.66 5.52 64.00 8.66 5.52 64.80 8.66 5.52 65.60 8.66 5.52 66.40 8.66 5.52 67.20 8.66 5.52 68.00 8.66 5.52 68.80 8.66 5.52 69.60 8.66 5.52 70.40 8.66 5.52 71.20 8.66 5.52 72.00 8.66 5.52 72.80 8.66 5.52 73.60 8.66 5.52 74.40 8.66 5.52 75.20 8.66 5.52 76.00 8.66 5.52 76.80 8.66 5.52 77.60 8.66 5.52 78.40 8.66 5.52 79.20 8.66 5.52 80.00 8.66 5.52 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

POA 2 proposed 2024-05-12 HydroCad - Proposed POA 2 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services Printed 6/29/2024 Page 165 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 21S: Basin 4 - Imp Runoff = 9.59 cfs @ 12.12 hrs, Volume= Routed to Pond 22P : Basin 4 35,125 cf, Depth= 8.42" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-80.00 hrs, dt= 0.04 hrs NOAA 24-hr D 100-Year Rainfall=8.66" Area (sf) 6,970 43,091 50,061 50,061 Tc (min) 0.9 Length (feet) 70 4.6 5.5 685 755 CN 98 98 98 Description Roofs, HSG D Paved parking, HSG C Weighted Average 100.00% Impervious Area Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 0.0200 1.33 Sheet Flow, Sheet Flow (A-B) Smooth surfaces n= 0.011 P2= 3.47" 2.50 Direct Entry, Pipe Flow (B-C) Total Subcatchment 21S: Basin 4 - Imp Hydrograph Runoff 10 9 8 Flow (cfs) 7 6 5 4 3 2 9.59 cfs NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=50,061 sf Runoff Volume=35,125 cf Runoff Depth=8.42" Flow Length=755' Slope=0.0200 '/' Tc=5.5 min CN=98 1 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 Time (hours)

POA 2 proposed 2024-05-12 HydroCad - Proposed POA 2 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services Printed 6/29/2024 Page 166 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 21S: Basin 4 - Imp Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.80 0.08 0.01 1.60 0.16 0.05 2.40 0.25 0.11 3.20 0.35 0.19 4.00 0.45 0.28 4.80 0.56 0.38 5.60 0.68 0.48 6.40 0.80 0.60 7.20 0.95 0.74 8.00 1.12 0.91 8.80 1.32 1.10 9.60 1.56 1.34 10.40 1.89 1.67 11.20 2.42 2.19 12.00 4.15 3.91 12.80 6.24 6.00 13.60 6.77 6.53 14.40 7.10 6.86 15.20 7.34 7.10 16.00 7.54 7.30 16.80 7.71 7.47 17.60 7.86 7.62 18.40 7.98 7.74 19.20 8.10 7.86 20.00 8.21 7.97 20.80 8.31 8.07 21.60 8.41 8.17 22.40 8.50 8.26 23.20 8.58 8.34 24.00 8.66 8.42 24.80 8.66 8.42 25.60 8.66 8.42 26.40 8.66 8.42 27.20 8.66 8.42 28.00 8.66 8.42 28.80 8.66 8.42 29.60 8.66 8.42 30.40 8.66 8.42 31.20 8.66 8.42 32.00 8.66 8.42 32.80 8.66 8.42 33.60 8.66 8.42 34.40 8.66 8.42 35.20 8.66 8.42 36.00 8.66 8.42 36.80 8.66 8.42 37.60 8.66 8.42 38.40 8.66 8.42 39.20 8.66 8.42 40.00 8.66 8.42 Runoff (cfs) 0.00 0.03 0.07 0.10 0.12 0.14 0.15 0.16 0.18 0.22 0.26 0.29 0.39 0.52 1.00 5.47 1.18 0.57 0.43 0.31 0.27 0.24 0.20 0.17 0.16 0.15 0.15 0.14 0.13 0.12 0.11 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Time Precip. Excess (hours) (inches)

43 0.31 0.27 0.24 0.20 0.17 0.16 0.15 0.15 0.14 0.13 0.12 0.11 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Time Precip. Excess (hours) (inches) (inches) 40.80 8.66 8.42 41.60 8.66 8.42 42.40 8.66 8.42 43.20 8.66 8.42 44.00 8.66 8.42 44.80 8.66 8.42 45.60 8.66 8.42 46.40 8.66 8.42 47.20 8.66 8.42 48.00 8.66 8.42 48.80 8.66 8.42 49.60 8.66 8.42 50.40 8.66 8.42 51.20 8.66 8.42 52.00 8.66 8.42 52.80 8.66 8.42 53.60 8.66 8.42 54.40 8.66 8.42 55.20 8.66 8.42 56.00 8.66 8.42 56.80 8.66 8.42 57.60 8.66 8.42 58.40 8.66 8.42 59.20 8.66 8.42 60.00 8.66 8.42 60.80 8.66 8.42 61.60 8.66 8.42 62.40 8.66 8.42 63.20 8.66 8.42 64.00 8.66 8.42 64.80 8.66 8.42 65.60 8.66 8.42 66.40 8.66 8.42 67.20 8.66 8.42 68.00 8.66 8.42 68.80 8.66 8.42 69.60 8.66 8.42 70.40 8.66 8.42 71.20 8.66 8.42 72.00 8.66 8.42 72.80 8.66 8.42 73.60 8.66 8.42 74.40 8.66 8.42 75.20 8.66 8.42 76.00 8.66 8.42 76.80 8.66 8.42 77.60 8.66 8.42 78.40 8.66 8.42 79.20 8.66 8.42 80.00 8.66 8.42 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

POA 2 proposed 2024-05-12 HydroCad - Proposed POA 2 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services Printed 6/29/2024 Page 167 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 24S: Basin 4 - Perv Runoff = 1.11 cfs @ 12.12 hrs, Volume= Routed to Pond 22P : Basin 4 3,462 cf, Depth= 5.52" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-80.00 hrs, dt= 0.04 hrs NOAA 24-hr D 100-Year Rainfall=8.66" Area (sf) 7,526 7,526 Tc (min) 0.9 Length (feet) 70 4.6 5.5 685 755 CN 74 Description >75% Grass cover, Good, HSG C 100.00% Pervious Area Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 0.0200 1.33 Sheet Flow, Sheet Flow (A-B) Smooth surfaces n= 0.011 P2= 3.47" 2.50 Direct Entry, Pipe Flow (B-C) Total Subcatchment 24S: Basin 4 - Perv Hydrograph Runoff 1.11 cfs Flow (cfs) 1 0 NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=7,526 sf Runoff Volume=3,462 cf Runoff Depth=5.52" Flow Length=755' Slope=0.0200 '/' Tc=5.5 min CN=74 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 Time (hours)

POA 2 proposed 2024-05-12 HydroCad - Proposed POA 2 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services Printed 6/29/2024 Page 168 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 24S: Basin 4 - Perv Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.80 0.08 0.00 1.60 0.16 0.00 2.40 0.25 0.00 3.20 0.35 0.00 4.00 0.45 0.00 4.80 0.56 0.00 5.60 0.68 0.00 6.40 0.80 0.00 7.20 0.95 0.02 8.00 1.12 0.05 8.80 1.32 0.09 9.60 1.56 0.17 10.40 1.89 0.30 11.20 2.42 0.57 12.00 4.15 1.71 12.80 6.24 3.39 13.60 6.77 3.84 14.40 7.10 4.13 15.20 7.34 4.34 16.00 7.54 4.51 16.80 7.71 4.67 17.60 7.86 4.80 18.40 7.98 4.91 19.20 8.10 5.01 20.00 8.21 5.11 20.80 8.31 5.20 21.60 8.41 5.29 22.40 8.50 5.37 23.20 8.58 5.45 24.00 8.66 5.52 24.80 8.66 5.52 25.60 8.66 5.52 26.40 8.66 5.52 27.20 8.66 5.52 28.00 8.66 5.52 28.80 8.66 5.52 29.60 8.66 5.52 30.40 8.66 5.52 31.20 8.66 5.52 32.00 8.66 5.52 32.80 8.66 5.52 33.60 8.66 5.52 34.40 8.66 5.52 35.20 8.66 5.52 36.00 8.66 5.52 36.80 8.66 5.52 37.60 8.66 5.52 38.40 8.66 5.52 39.20 8.66 5.52 40.00 8.66 5.52 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.02 0.03 0.08 0.59 0.15 0.07 0.06 0.04 0.04 0.03 0.03 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Time Precip. Excess (hours) (inches)

06 0.04 0.04 0.03 0.03 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Time Precip. Excess (hours) (inches) (inches) 40.80 8.66 5.52 41.60 8.66 5.52 42.40 8.66 5.52 43.20 8.66 5.52 44.00 8.66 5.52 44.80 8.66 5.52 45.60 8.66 5.52 46.40 8.66 5.52 47.20 8.66 5.52 48.00 8.66 5.52 48.80 8.66 5.52 49.60 8.66 5.52 50.40 8.66 5.52 51.20 8.66 5.52 52.00 8.66 5.52 52.80 8.66 5.52 53.60 8.66 5.52 54.40 8.66 5.52 55.20 8.66 5.52 56.00 8.66 5.52 56.80 8.66 5.52 57.60 8.66 5.52 58.40 8.66 5.52 59.20 8.66 5.52 60.00 8.66 5.52 60.80 8.66 5.52 61.60 8.66 5.52 62.40 8.66 5.52 63.20 8.66 5.52 64.00 8.66 5.52 64.80 8.66 5.52 65.60 8.66 5.52 66.40 8.66 5.52 67.20 8.66 5.52 68.00 8.66 5.52 68.80 8.66 5.52 69.60 8.66 5.52 70.40 8.66 5.52 71.20 8.66 5.52 72.00 8.66 5.52 72.80 8.66 5.52 73.60 8.66 5.52 74.40 8.66 5.52 75.20 8.66 5.52 76.00 8.66 5.52 76.80 8.66 5.52 77.60 8.66 5.52 78.40 8.66 5.52 79.20 8.66 5.52 80.00 8.66 5.52 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

POA 2 proposed 2024-05-12 HydroCad - Proposed POA 2 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services Printed 6/29/2024 Page 169 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 25S: Basin 2 - Perv Runoff = 10.39 cfs @ 12.18 hrs, Volume= Routed to Pond 27P : Basin 2 39,275 cf, Depth= 6.00" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-80.00 hrs, dt= 0.04 hrs NOAA 24-hr D 100-Year Rainfall=8.66" Area (sf) 47,097 31,398 78,495 78,495 Tc (min) 9.0 1.5 10.5 CN 80 74 78 Description >75% Grass cover, Good, HSG D >75% Grass cover, Good, HSG C Weighted Average 100.00% Pervious Area Length (feet) 93 Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 0.0500 0.17 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" Using McCuen-Spiess flow length 370 0.0650 4.10 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps 463 Total Subcatchment 25S: Basin 2 - Perv Hydrograph 11 10 9 8 Flow (cfs) 7 6 5 4 3 Runoff 10.39 cfs NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=78,495 sf Runoff Volume=39,275 cf Runoff Depth=6.00" Flow Length=463' Tc=10.5 min CN=78 2 1 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 Time (hours)

POA 2 proposed 2024-05-12 HydroCad - Proposed POA 2 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services Printed 6/29/2024 Page 170 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 25S: Basin 2 - Perv Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.80 0.08 0.00 1.60 0.16 0.00 2.40 0.25 0.00 3.20 0.35 0.00 4.00 0.45 0.00 4.80 0.56 0.00 5.60 0.68 0.00 6.40 0.80 0.02 7.20 0.95 0.05 8.00 1.12 0.09 8.80 1.32 0.16 9.60 1.56 0.26 10.40 1.89 0.43 11.20 2.42 0.74 12.00 4.15 2.01 12.80 6.24 3.79 13.60 6.77 4.26 14.40 7.10 4.56 15.20 7.34 4.78 16.00 7.54 4.96 16.80 7.71 5.12 17.60 7.86 5.26 18.40 7.98 5.37 19.20 8.10 5.48 20.00 8.21 5.58 20.80 8.31 5.68 21.60 8.41 5.77 22.40 8.50 5.85 23.20 8.58 5.93 24.00 8.66 6.00 24.80 8.66 6.00 25.60 8.66 6.00 26.40 8.66 6.00 27.20 8.66 6.00 28.00 8.66 6.00 28.80 8.66 6.00 29.60 8.66 6.00 30.40 8.66 6.00 31.20 8.66 6.00 32.00 8.66 6.00 32.80 8.66 6.00 33.60 8.66 6.00 34.40 8.66 6.00 35.20 8.66 6.00 36.00 8.66 6.00 36.80 8.66 6.00 37.60 8.66 6.00 38.40 8.66 6.00 39.20 8.66 6.00 40.00 8.66 6.00 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.04 0.07 0.12 0.17 0.27 0.42 0.90 4.61 1.78 0.87 0.63 0.45 0.39 0.34 0.29 0.25 0.24 0.23 0.21 0.20 0.19 0.18 0.16 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Time Precip. Excess (hours) (inches)

63 0.45 0.39 0.34 0.29 0.25 0.24 0.23 0.21 0.20 0.19 0.18 0.16 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Time Precip. Excess (hours) (inches) (inches) 40.80 8.66 6.00 41.60 8.66 6.00 42.40 8.66 6.00 43.20 8.66 6.00 44.00 8.66 6.00 44.80 8.66 6.00 45.60 8.66 6.00 46.40 8.66 6.00 47.20 8.66 6.00 48.00 8.66 6.00 48.80 8.66 6.00 49.60 8.66 6.00 50.40 8.66 6.00 51.20 8.66 6.00 52.00 8.66 6.00 52.80 8.66 6.00 53.60 8.66 6.00 54.40 8.66 6.00 55.20 8.66 6.00 56.00 8.66 6.00 56.80 8.66 6.00 57.60 8.66 6.00 58.40 8.66 6.00 59.20 8.66 6.00 60.00 8.66 6.00 60.80 8.66 6.00 61.60 8.66 6.00 62.40 8.66 6.00 63.20 8.66 6.00 64.00 8.66 6.00 64.80 8.66 6.00 65.60 8.66 6.00 66.40 8.66 6.00 67.20 8.66 6.00 68.00 8.66 6.00 68.80 8.66 6.00 69.60 8.66 6.00 70.40 8.66 6.00 71.20 8.66 6.00 72.00 8.66 6.00 72.80 8.66 6.00 73.60 8.66 6.00 74.40 8.66 6.00 75.20 8.66 6.00 76.00 8.66 6.00 76.80 8.66 6.00 77.60 8.66 6.00 78.40 8.66 6.00 79.20 8.66 6.00 80.00 8.66 6.00 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00