48 001 STORMWATER REPORT 20240823 Sealed

4 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 = 2 yrs = 1 min = 0.248 ac = 0.0 % = User = 3.40 in = 24 hrs Peak discharge Time to peak Hyd. volume Curve number Hydraulic length Time of conc. (Tc) Distribution Shape factor = 0.843 cfs = 722 min = 2,477 cuft = 95.9 = 0 ft = 2.00 min = Type III = 484 BASIN 1 Q (cfs) Q (cfs) Hyd. No. 2 -- 2 Year 1.00 1.00 0.90 0.90 0.80 0.80 0.70 0.70 0.60 0.60 0.50 0.50 0.40 0.40 0.30 0.30 0.20 0.20 0.10 0.10 0.00 0 120 240 Hyd No. 2 360 480 600 720 840 960 1080 1200 1320 1440 0.00 Time (min)

5 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 = 2 yrs = 1 min = 0.023 ac = 0.0 % = User = 3.40 in = 24 hrs Peak discharge Time to peak Hyd. volume Curve number Hydraulic length Time of conc. (Tc) Distribution Shape factor = 0.065 cfs = 722 min = 179 cuft = 88.9 = 0 ft = 2.00 min = Type III = 484 BASIN 2 Q (cfs) Q (cfs) Hyd. No. 3 -- 2 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. 3 360 480 600 720 840 960 1080 1200 1320 1440 0.00 Time (min)

6 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 = 2 yrs = 1 min = 0.003 ac = 0.0 % = User = 3.40 in = 24 hrs Peak discharge Time to peak Hyd. volume Curve number Hydraulic length Time of conc. (Tc) Distribution Shape factor = 0.005 cfs = 722 min = 14 cuft = 79 = 0 ft = 2.00 min = Type III = 484 BASIN 3 Q (cfs) Q (cfs) Hyd. No. 4 -- 2 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 1560 0.00 Time (min)

7 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 = 2 yrs = 1 min = 3, 4 Peak discharge Time to peak Hyd. volume Contrib. drain. area = 0.070 cfs = 722 min = 193 cuft = 0.026 ac BASIN 2 & 3 Q (cfs) Q (cfs) Hyd. No. 5 -- 2 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. 5 360 480 600 Hyd No. 3 720 840 960 Hyd No. 4 1080 1200 1320 1440 0.00 Time (min)

8 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 = 2 yrs = 1 min = 2 - BASIN 1 = CHAMBERS Peak discharge Time to peak Hyd. volume Max. Elevation Max. Storage = 0.500 cfs = 726 min = 2,349 cuft = 100.77 ft = 455 cuft Storage Indication method used. CHAMBERS Q (cfs) Q (cfs) Hyd. No. 6 -- 2 Year 1.00 1.00 0.90 0.90 0.80 0.80 0.70 0.70 0.60 0.60 0.50 0.50 0.40 0.40 0.30 0.30 0.20 0.20 0.10 0.10 0.00 0 120 240 Hyd No. 6 360 480 600 Hyd No. 2 720 840 960 1080 1200 1320 Total storage used = 455 cuft 1440 1560 0.00 Time (min)

9 Pond Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2024 Wednesday, 06 / 5 / 2024 Pond No. 1 - CHAMBERS Pond Data UG Chambers - Invert elev. = 100.00 ft , Rise x Span = 1.15 x 2.30 ft , Barrel Len = 7.12 ft , No. Barrels = 24 , Slope = 0.00% , Headers = No Encasement - Invert elev. = 99.50 ft , Width = 3.33 ft, Height = 2.33 ft , Voids = 40.00% Stage / Storage Table Stage (ft) 0.00 0.23 0.47 0.70 0.93 1.17 1.40 1.63 1.86 2.10 2.33 Elevation (ft) Contour area (sqft) Incr. Storage (cuft) Total storage (cuft) n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a 0 53 53 100 106 101 93 78 54 53 53 0 53 106 206 312 413 506 584 637 690 743 99.50 99.73 99.97 100.20 100.43 100.67 100.90 101.13 101.36 101.60 101.83 Culvert / Orifice Structures Rise (in) Span (in) No. Barrels Invert El. (ft) Length (ft) Slope (%) N-Value Orifice Coeff. Multi-Stage Weir Structures [A] [B] [C] [PrfRsr] = 5.00 = 5.00 = 1 = 100.00 = 0.00 = 0.00 = .013 = 0.60 = n/a 2.00 9.00 1 100.75 0.00 0.00 .013 0.60 No 2.00 9.00 1 101.16 0.00 0.00 .013 0.60 No 0.00 0.00 0 0.00 0.00 n/a n/a 0.60 No [A] [B] [C] [D] Crest Len (ft) Crest El. (ft) Weir Coeff. Weir Type Multi-Stage = 0.00 = 0.00 = 3.33 = --= No 0.00 0.00 3.33 --No 0.00 0.00 3.33 --No 0.00 0.00 3.33 --No Exfil.(in/hr) TW Elev. (ft) = 0.000 (by Wet area) = 0.00 Note: Culvert/Orifice outflows are analyzed under inlet (ic) and outlet (oc) control. Weir risers checked for orifice conditions (ic) and submergence (s). Stage / Discharge Stage (ft) Elev (ft) 3.00 102.50 2.00 101.50 1.00 100.50 0.00 99.50 0.00 0.50 Total Q 1.00 1.50 2.00 Discharge (cfs)

10 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 = 2 yrs = 1 min = 5, 6 Peak discharge Time to peak Hyd. volume Contrib. drain. area = 0.546 cfs = 726 min = 2,542 cuft = 0.000 ac TOTAL POST Q (cfs) Q (cfs) Hyd. No. 7 -- 2 Year 1.00 1.00 0.90 0.90 0.80 0.80 0.70 0.70 0.60 0.60 0.50 0.50 0.40 0.40 0.30 0.30 0.20 0.20 0.10 0.10 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)

11 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 1.156 1 724 3,615 ------ ------ ------ EX-1 2 SCS Runoff 1.317 1 722 3,974 ------ ------ ------ BASIN 1 3 SCS Runoff 0.111 1 722 313 ------ ------ ------ BASIN 2 4 SCS Runoff 0.010 1 722 27 ------ ------ ------ BASIN 3 5 Combine 0.121 1 722 340 3, 4 ------ ------ BASIN 2 & 3 6 Reservoir 0.971 1 725 3,846 2 101.14 7 Combine 1.063 1 725 4,186 5, 6 ------ PRE & POST FINALLY.gpw Time to (min) Return Period: 10 Year 587 ------ CHAMBERS TOTAL POST Wednesday, 06 / 5 / 2024

12 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 = 10 yrs = 1 min = 0.274 ac = 0.0 % = TR55 = 5.19 in = 24 hrs Peak discharge Time to peak Hyd. volume Curve number Hydraulic length Time of conc. (Tc) Distribution Shape factor = 1.156 cfs = 724 min = 3,615 cuft = 84.8 = 0 ft = 6.50 min = Type III = 484 EX-1 Q (cfs) Q (cfs) Hyd. No. 1 -- 10 Year 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 1560 0.00 Time (min)

13 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 = 10 yrs = 1 min = 0.248 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 = 1.317 cfs = 722 min = 3,974 cuft = 95.9 = 0 ft = 2.00 min = Type III = 484 BASIN 1 Q (cfs) Q (cfs) Hyd. No. 2 -- 10 Year 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)