ZB 22 13 2023 03 Drainage Statement

2 Hydrograph Return Period Recap Hydraflow Hydrographs by Intelisolve v9.1 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 ------- ------- 2.696 ------- ------- 4.116 ------- ------- 6.851 Existing Site (Impervious) 2 SCS Runoff ------- ------- 0.224 ------- ------- 0.533 ------- ------- 1.215 Existing Site (Pervious) 3 Combine 1, 2 ------- 2.913 ------- ------- 4.640 ------- ------- 8.056 Existing Total 5 SCS Runoff ------- ------- 2.343 ------- ------- 3.577 ------- ------- 5.953 Proposed Site (Impervious) 6 SCS Runoff ------- ------- 0.460 ------- ------- 0.973 ------- ------- 2.048 Proposed Site (Pervious) 7 Combine 5, 6 ------- 2.795 ------- ------- 4.538 ------- ------- 7.991 Proposed Total Proj. file: 2023-04-03 2, 10, 100 yr.gpw Wednesday, Apr 5, 2023