251203_42 ERW_Stormwater Report

251202_42 ERW Waystone - Future Rainfall NOAA 24-hr D 25-Year Rainfall=6.44" Printed 12/3/2025 Page 65 Prepared by Colliers Engineering & Design HydroCAD® 10.20-5c s/n 04431 © 2023 HydroCAD Software Solutions LLC Stage-Discharge for Pond BASIN: Elevation (feet) 15.00 15.05 15.10 15.15 15.20 15.25 15.30 15.35 15.40 15.45 15.50 15.55 15.60 15.65 15.70 15.75 15.80 15.85 15.90 15.95 16.00 16.05 16.10 16.15 16.20 16.25 16.30 16.35 16.40 16.45 16.50 16.55 16.60 16.65 16.70 16.75 16.80 16.85 16.90 16.95 17.00 17.05 17.10 17.15 17.20 17.25 17.30 17.35 17.40 17.45 17.50 17.55 Discharge (cfs) 0.00 0.17 0.18 0.18 0.19 0.19 0.19 0.20 0.20 0.21 0.21 0.22 0.22 0.22 0.23 0.23 0.24 0.24 0.25 0.30 0.39 0.50 0.62 0.76 0.91 1.02 1.11 1.19 1.27 1.34 1.41 1.47 1.53 1.59 1.65 1.71 1.85 2.02 2.23 2.45 2.70 2.96 3.24 3.53 3.78 3.99 4.19 4.37 4.54 4.70 4.85 5.00 Discarded (cfs) 0.00 0.17 0.18 0.18 0.19 0.19 0.19 0.20 0.20 0.21 0.21 0.22 0.22 0.22 0.23 0.23 0.24 0.24 0.24 0.25 0.25 0.26 0.26 0.27 0.27 0.27 0.28 0.28 0.29 0.29 0.30 0.30 0.30 0.31 0.31 0.32 0.32 0.33 0.33 0.33 0.34 0.34 0.35 0.35 0.35 0.36 0.36 0.37 0.37 0.38 0.38 0.38 Primary (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 0.06 0.14 0.24 0.36 0.50 0.64 0.74 0.83 0.91 0.98 1.05 1.11 1.17 1.23 1.28 1.33 1.40 1.53 1.70 1.90 2.12 2.36 2.62 2.89 3.18 3.42 3.63 3.82 4.00 4.16 4.32 4.47 4.62 Elevation (feet) 17.60 17.65 17.70 17.75 17.80 17.85 17.90 17.95 18.00 18.05 18.10 18.15 18.20 18.25 18.30 18.35 18.40 18.45 18.50 18.55 18.60 18.65 18.70 18.75 18.80 18.85 18.90 18.95 19.00 19.05 19.10 19.15 19.20 19.25 19.30 19.35 19.40 19.45 19.50 19.55 19.60 19.65 19.70 19.75 19.80 19.85 19.90 19.95 20.00 Discharge (cfs) 5.15 5.28 5.42 5.55 5.68 5.80 5.92 6.04 6.16 6.27 6.38 6.49 6.60 6.71 6.81 6.91 7.01 7.11 7.21 7.31 7.40 7.50 7.59 7.68 7.80 7.95 8.11 8.29 8.48 8.68 8.90 9.12 9.36 9.61 9.87 10.14 10.43 10.74 11.06 11.39 11.69 12.01 12.33 12.65 12.98 13.31 13.65 13.99 14.34 Discarded (cfs) 0.39 0.39 0.40 0.40 0.41 0.41 0.41 0.42 0.42 0.43 0.43 0.43 0.44 0.44 0.45 0.45 0.46 0.46 0.46 0.47 0.47 0.48 0.48 0.49 0.49 0.49 0.50 0.50 0.51 0.51 0.52 0.52 0.52 0.53 0.53 0.54 0.54 0.54 0.55 0.55 0.56 0.56 0.57 0.57 0.57 0.58 0.58 0.59 0.59 Primary (cfs) 4.76 4.89 5.02 5.15 5.27 5.39 5.51 5.62 5.74 5.85 5.95 6.06 6.16 6.26 6.36 6.46 6.56 6.65 6.75 6.84 6.93 7.02 7.11 7.20 7.31 7.46

0.55 0.55 0.56 0.56 0.57 0.57 0.57 0.58 0.58 0.59 0.59 Primary (cfs) 4.76 4.89 5.02 5.15 5.27 5.39 5.51 5.62 5.74 5.85 5.95 6.06 6.16 6.26 6.36 6.46 6.56 6.65 6.75 6.84 6.93 7.02 7.11 7.20 7.31 7.46 7.62 7.79 7.97 8.17 8.38 8.60 8.83 9.08 9.34 9.60 9.89 10.19 10.51 10.83 11.14 11.45 11.76 12.08 12.41 12.73 13.07 13.41 13.75