V4 11 Stormwater Report Rev 3 1 26 2023

2 Hydrograph Return Period Recap Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Hyd. Hydrograph Inflow Peak Outflow (cfs) Hydrograph No. type hyd(s) Description (origin) 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr 1 SCS Runoff ------ ------- 2.479 ------- ------- 3.787 4.680 ------- 6.303 DA-1A (Impervious) 2 SCS Runoff ------ ------- 4.032 ------- ------- 10.61 15.73 ------- 25.69 DA-1A (Pervious) 3 Combine 1, 2 ------- 6.121 ------- ------- 13.83 19.77 ------- 31.25 DA-1A 4 SCS Runoff ------ ------- 0.172 ------- ------- 0.437 0.642 ------- 1.038 DA-1B 5 SCS Runoff ------ ------- 0.429 ------- ------- 1.092 1.604 ------- 2.594 DA-2 6 SCS Runoff ------ ------- 5.917 ------- ------- 9.036 11.17 ------- 15.04 DA-3 (Impervious) 7 SCS Runoff ------ ------- 1.361 ------- ------- 3.872 5.862 ------- 9.775 DA-3 (Pervious) 8 Combine 6, 7 ------- 6.988 ------- ------- 12.47 16.50 ------- 24.15 DA-3 9 SCS Runoff ------ ------- 0.085 ------- ------- 0.129 0.160 ------- 0.215 DA-4 (Impervious) 10 SCS Runoff ------ ------- 1.365 ------- ------- 2.996 4.203 ------- 6.501 DA-4 (Pervious) 11 Combine 9, 10 ------- 1.447 ------- ------- 3.122 4.358 ------- 6.716 DA-4 12 SCS Runoff ------ ------- 1.521 ------- ------- 2.324 2.872 ------- 3.868 DA-5 (Impervious) 13 SCS Runoff ------ ------- 0.039 ------- ------- 0.797 2.078 ------- 5.043 DA-5 (Pervious) 14 Combine 12, 13 ------- 1.521 ------- ------- 2.844 4.614 ------- 8.458

------- ------- 0.797 2.078 ------- 5.043 DA-5 (Pervious) 14 Combine 12, 13 ------- 1.521 ------- ------- 2.844 4.614 ------- 8.458 DA-5 15 SCS Runoff ------ ------- 9.664 ------- ------- 14.76 18.24 ------- 24.57 DA-6 16 Combine 3, 4, ------- 6.280 ------- ------- 14.25 20.39 ------- 32.27 To Basin #1 17 Reservoir 16 ------- 1.473 ------- ------- 14.01 20.15 ------- 31.90 Basin #1 18 Combine 8, 17 ------- 7.343 ------- ------- 24.43 35.85 ------- 55.19 Combined - SS Southern Driveway 19 Combine 5, 11, 14, ------- 20.08 ------- ------- 45.76 64.11 ------- 96.75 Total Offsite 15, 18 Proj. file: Existing Conditions.gpw Wednesday, 11 / 2 / 2022