48 001 STORMWATER REPORT 20240823 Sealed

14 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2024 Wednesday, 06 / 5 / 2024 Hyd. No. 3 BASIN 2 Hydrograph type Storm frequency Time interval Drainage area Basin Slope Tc method Total precip. Storm duration = SCS Runoff = 10 yrs = 1 min = 0.023 ac = 0.0 % = User = 5.19 in = 24 hrs Peak discharge Time to peak Hyd. volume Curve number Hydraulic length Time of conc. (Tc) Distribution Shape factor = 0.111 cfs = 722 min = 313 cuft = 88.9 = 0 ft = 2.00 min = Type III = 484 BASIN 2 Q (cfs) Q (cfs) Hyd. No. 3 -- 10 Year 0.50 0.50 0.45 0.45 0.40 0.40 0.35 0.35 0.30 0.30 0.25 0.25 0.20 0.20 0.15 0.15 0.10 0.10 0.05 0.05 0.00 0 120 240 Hyd No. 3 360 480 600 720 840 960 1080 1200 1320 1440 0.00 Time (min)

15 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2024 Wednesday, 06 / 5 / 2024 Hyd. No. 4 BASIN 3 Hydrograph type Storm frequency Time interval Drainage area Basin Slope Tc method Total precip. Storm duration = SCS Runoff = 10 yrs = 1 min = 0.003 ac = 0.0 % = User = 5.19 in = 24 hrs Peak discharge Time to peak Hyd. volume Curve number Hydraulic length Time of conc. (Tc) Distribution Shape factor = 0.010 cfs = 722 min = 27 cuft = 79 = 0 ft = 2.00 min = Type III = 484 BASIN 3 Q (cfs) Q (cfs) Hyd. No. 4 -- 10 Year 0.10 0.10 0.09 0.09 0.08 0.08 0.07 0.07 0.06 0.06 0.05 0.05 0.04 0.04 0.03 0.03 0.02 0.02 0.01 0.01 0.00 0 120 240 Hyd No. 4 360 480 600 720 840 960 1080 1200 1320 1440 0.00 Time (min)

16 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2024 Wednesday, 06 / 5 / 2024 Hyd. No. 5 BASIN 2 & 3 Hydrograph type Storm frequency Time interval Inflow hyds. = Combine = 10 yrs = 1 min = 3, 4 Peak discharge Time to peak Hyd. volume Contrib. drain. area = 0.121 cfs = 722 min = 340 cuft = 0.026 ac BASIN 2 & 3 Q (cfs) Q (cfs) Hyd. No. 5 -- 10 Year 0.50 0.50 0.45 0.45 0.40 0.40 0.35 0.35 0.30 0.30 0.25 0.25 0.20 0.20 0.15 0.15 0.10 0.10 0.05 0.05 0.00 0 120 240 Hyd No. 5 360 480 600 Hyd No. 3 720 840 960 Hyd No. 4 1080 1200 1320 1440 0.00 Time (min)

17 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2024 Wednesday, 06 / 5 / 2024 Hyd. No. 6 CHAMBERS Hydrograph type Storm frequency Time interval Inflow hyd. No. Reservoir name = Reservoir = 10 yrs = 1 min = 2 - BASIN 1 = CHAMBERS Peak discharge Time to peak Hyd. volume Max. Elevation Max. Storage = 0.971 cfs = 725 min = 3,846 cuft = 101.14 ft = 587 cuft Storage Indication method used. CHAMBERS Q (cfs) Q (cfs) Hyd. No. 6 -- 10 Year 2.00 2.00 1.00 1.00 0.00 0 120 240 Hyd No. 6 360 480 600 Hyd No. 2 720 840 960 1080 1200 1320 Total storage used = 587 cuft 1440 1560 0.00 Time (min)

18 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2024 Wednesday, 06 / 5 / 2024 Hyd. No. 7 TOTAL POST Hydrograph type Storm frequency Time interval Inflow hyds. = Combine = 10 yrs = 1 min = 5, 6 Peak discharge Time to peak Hyd. volume Contrib. drain. area = 1.063 cfs = 725 min = 4,186 cuft = 0.000 ac TOTAL POST Q (cfs) Q (cfs) Hyd. No. 7 -- 10 Year 2.00 2.00 1.00 1.00 0.00 0 120 240 Hyd No. 7 360 480 600 Hyd No. 5 720 840 960 Hyd No. 6 1080 1200 1320 1440 1560 0.00 Time (min)

19 Hydrograph Summary Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2024 Hyd. Hydrograph Peak Time Hyd. Inflow Maximum Total Hydrograph No. type flow interval Peak volume hyd(s) elevation strge used Description (origin) (cfs) (min) (cuft) (ft) (cuft) 1 SCS Runoff 2.183 1 724 7,023 ------ ------ ------ EX-1 2 SCS Runoff 2.231 1 722 6,907 ------ ------ ------ BASIN 1 3 SCS Runoff 0.200 1 722 583 ------ ------ ------ BASIN 2 4 SCS Runoff 0.020 1 722 56 ------ ------ ------ BASIN 3 5 Combine 0.220 1 722 639 3, 4 ------ ------ BASIN 2 & 3 6 Reservoir 1.893 1 724 6,779 2 101.82 7 Combine 2.081 1 724 7,418 5, 6 ------ PRE & POST FINALLY.gpw Time to (min) Return Period: 100 Year 742 ------ CHAMBERS TOTAL POST Wednesday, 06 / 5 / 2024

20 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2024 Wednesday, 06 / 5 / 2024 Hyd. No. 1 EX-1 Hydrograph type Storm frequency Time interval Drainage area Basin Slope Tc method Total precip. Storm duration = SCS Runoff = 100 yrs = 1 min = 0.274 ac = 0.0 % = TR55 = 8.68 in = 24 hrs Peak discharge Time to peak Hyd. volume Curve number Hydraulic length Time of conc. (Tc) Distribution Shape factor = 2.183 cfs = 724 min = 7,023 cuft = 84.8 = 0 ft = 6.50 min = Type III = 484 EX-1 Q (cfs) Q (cfs) Hyd. No. 1 -- 100 Year 3.00 3.00 2.00 2.00 1.00 1.00 0.00 0 120 240 Hyd No. 1 360 480 600 720 840 960 1080 1200 1320 1440 0.00 Time (min)

21 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2024 Wednesday, 06 / 5 / 2024 Hyd. No. 2 BASIN 1 Hydrograph type Storm frequency Time interval Drainage area Basin Slope Tc method Total precip. Storm duration = SCS Runoff = 100 yrs = 1 min = 0.248 ac = 0.0 % = User = 8.68 in = 24 hrs Peak discharge Time to peak Hyd. volume Curve number Hydraulic length Time of conc. (Tc) Distribution Shape factor = 2.231 cfs = 722 min = 6,907 cuft = 95.9 = 0 ft = 2.00 min = Type III = 484 BASIN 1 Q (cfs) Q (cfs) Hyd. No. 2 -- 100 Year 3.00 3.00 2.00 2.00 1.00 1.00 0.00 0 120 240 Hyd No. 2 360 480 600 720 840 960 1080 1200 1320 1440 0.00 Time (min)

22 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2024 Wednesday, 06 / 5 / 2024 Hyd. No. 3 BASIN 2 Hydrograph type Storm frequency Time interval Drainage area Basin Slope Tc method Total precip. Storm duration = SCS Runoff = 100 yrs = 1 min = 0.023 ac = 0.0 % = User = 8.68 in = 24 hrs Peak discharge Time to peak Hyd. volume Curve number Hydraulic length Time of conc. (Tc) Distribution Shape factor = 0.200 cfs = 722 min = 583 cuft = 88.9 = 0 ft = 2.00 min = Type III = 484 BASIN 2 Q (cfs) Q (cfs) Hyd. No. 3 -- 100 Year 0.50 0.50 0.45 0.45 0.40 0.40 0.35 0.35 0.30 0.30 0.25 0.25 0.20 0.20 0.15 0.15 0.10 0.10 0.05 0.05 0.00 0 120 240 Hyd No. 3 360 480 600 720 840 960 1080 1200 1320 1440 0.00 Time (min)

23 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2024 Wednesday, 06 / 5 / 2024 Hyd. No. 4 BASIN 3 Hydrograph type Storm frequency Time interval Drainage area Basin Slope Tc method Total precip. Storm duration = SCS Runoff = 100 yrs = 1 min = 0.003 ac = 0.0 % = User = 8.68 in = 24 hrs Peak discharge Time to peak Hyd. volume Curve number Hydraulic length Time of conc. (Tc) Distribution Shape factor = 0.020 cfs = 722 min = 56 cuft = 79 = 0 ft = 2.00 min = Type III = 484 BASIN 3 Q (cfs) Q (cfs) Hyd. No. 4 -- 100 Year 0.10 0.10 0.09 0.09 0.08 0.08 0.07 0.07 0.06 0.06 0.05 0.05 0.04 0.04 0.03 0.03 0.02 0.02 0.01 0.01 0.00 0 120 240 Hyd No. 4 360 480 600 720 840 960 1080 1200 1320 1440 0.00 Time (min)