V4 11 Stormwater Report Rev 3 1 26 2023

66 Hydrograph Summary Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval Peak volume hyd(s) elevation strge used Description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 SCS Runoff 6.303 3 723 25,215 ------ ------ ------ DA-1A (Impervious) 2 SCS Runoff 25.69 3 729 103,346 ------ ------ ------ DA-1A (Pervious) 3 Combine 31.25 3 726 128,561 1, 2 ------ ------ DA-1A 4 SCS Runoff 1.038 3 729 4,178 ------ ------ ------ DA-1B 5 SCS Runoff 2.594 3 729 10,444 ------ ------ ------ DA-2 6 SCS Runoff 15.04 3 723 60,173 ------ ------ ------ DA-3 (Impervious) 7 SCS Runoff 9.775 3 729 39,276 ------ ------ ------ DA-3 (Pervious) 8 Combine 24.15 3 726 99,448 6, 7 ------ ------ DA-3 9 SCS Runoff 0.215 3 723 860 ------ ------ ------ DA-4 (Impervious) 10 SCS Runoff 6.501 3 723 22,416 ------ ------ ------ DA-4 (Pervious) 11 Combine 6.716 3 723 23,275 9, 10 ------ ------ DA-4 12 SCS Runoff 3.868 3 723 15,473 ------ ------ ------ DA-5 (Impervious) 13 SCS Runoff 5.043 3 729 21,812 ------ ------ ------ DA-5 (Pervious) 14 Combine 8.458 3 726 37,285 12, 13 ------ ------ DA-5 15 SCS Runoff 24.57 3 723 98,282 ------ ------ ------ DA-6 16 Combine 32.27 3 726 132,738 3, 4, ------ ------ To Basin #1 17 Reservoir 31.90 3 729 132,731 16

DA-6 16 Combine 32.27 3 726 132,738 3, 4, ------ ------ To Basin #1 17 Reservoir 31.90 3 729 132,731 16 419.70 13,062 Basin #1 18 Combine 55.19 3 726 232,179 8, 17 ------ ------ Combined - SS Southern Driveway 19 Combine 96.75 3 726 401,465 5, 11, 14, ------ ------ Total Offsite 15, 18 Existing Conditions.gpw Return Period: 100 Year Wednesday, 11 / 2 / 2022