V4 11 Stormwater Report Rev 3 1 26 2023

Contents continued... Existing Conditions.gpw Precipitation Report........................................................................................................... 42 Hydrograph No. 5, SCS Runoff, DA-2.................................................................................... 43 Precipitation Report........................................................................................................... 44 Hydrograph No. 6, SCS Runoff, DA-3 (Impervious)............................................................... 45 Precipitation Report........................................................................................................... 46 Hydrograph No. 7, SCS Runoff, DA-3 (Pervious).................................................................. 47 Precipitation Report........................................................................................................... 48 Hydrograph No. 8, Combine, DA-3........................................................................................ 49 Hydrograph No. 9, SCS Runoff, DA-4 (Impervious)............................................................... 50 Precipitation Report........................................................................................................... 51 Hydrograph No. 10, SCS Runoff, DA-4 (Pervious)................................................................ 52 Precipitation Report........................................................................................................... 53 Hydrograph No. 11, Combine, DA-4....................................................................................... 54 Hydrograph No. 12, SCS Runoff, DA-5 (Impervious)............................................................. 55 Precipitation Report........................................................................................................... 56 Hydrograph No. 13, SCS Runoff, DA-5 (Pervious)................................................................ 57 Precipitation Report........................................................................................................... 58

................................................... 57 Precipitation Report........................................................................................................... 58 Hydrograph No. 14, Combine, DA-5...................................................................................... 59 Hydrograph No. 15, SCS Runoff, DA-6.................................................................................. 60 Precipitation Report........................................................................................................... 61 Hydrograph No. 16, Combine, To Basin #1............................................................................ 62 Hydrograph No. 17, Reservoir, Basin #1................................................................................ 63 Hydrograph No. 18, Combine, Combined - SS Southern Driveway....................................... 64 Hydrograph No. 19, Combine, Total Offsite............................................................................ 65 100 - Year Summary Report....................................................................................................................... 66 Hydrograph Reports................................................................................................................. 67 Hydrograph No. 1, SCS Runoff, DA-1A (Impervious)............................................................. 67 Precipitation Report........................................................................................................... 68 Hydrograph No. 2, SCS Runoff, DA-1A (Pervious)................................................................ 69 Precipitation Report........................................................................................................... 70 Hydrograph No. 3, Combine, DA-1A...................................................................................... 71 Hydrograph No. 4, SCS Runoff, DA-1B................................................................................. 72 Precipitation Report........................................................................................................... 73 Hydrograph No. 5, SCS Runoff,

...................... 72 Precipitation Report........................................................................................................... 73 Hydrograph No. 5, SCS Runoff, DA-2.................................................................................... 74 Precipitation Report........................................................................................................... 75 Hydrograph No. 6, SCS Runoff, DA-3 (Impervious)............................................................... 76 Precipitation Report........................................................................................................... 77 Hydrograph No. 7, SCS Runoff, DA-3 (Pervious).................................................................. 78 Precipitation Report........................................................................................................... 79 Hydrograph No. 8, Combine, DA-3........................................................................................ 80 Hydrograph No. 9, SCS Runoff, DA-4 (Impervious)............................................................... 81 Precipitation Report........................................................................................................... 82 Hydrograph No. 10, SCS Runoff, DA-4 (Pervious)................................................................ 83 Precipitation Report........................................................................................................... 84 Hydrograph No. 11, Combine, DA-4....................................................................................... 85 Hydrograph No. 12, SCS Runoff, DA-5 (Impervious)............................................................. 86 Precipitation Report........................................................................................................... 87 Hydrograph No. 13, SCS Runoff, DA-5 (Pervious)................................................................ 88 Precipitation Report........................................................................................................... 89

Contents continued... Existing Conditions.gpw Hydrograph No. 14, Combine, DA-5...................................................................................... 90 Hydrograph No. 15, SCS Runoff, DA-6.................................................................................. 91 Precipitation Report........................................................................................................... 92 Hydrograph No. 16, Combine, To Basin #1............................................................................ 93 Hydrograph No. 17, Reservoir, Basin #1................................................................................ 94 Hydrograph No. 18, Combine, Combined - SS Southern Driveway....................................... 95 Hydrograph No. 19, Combine, Total Offsite............................................................................ 96 IDF Report.................................................................................................................. 97

1 Watershed Model Schematic Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 1 2 4 6 7 5 9 10 12 13 15 11 14 8 3 16 17 18 Legend Hyd. Origin Description 1 SCS Runoff DA-1A (Impervious) 2 SCS Runoff DA-1A (Pervious) 3 Combine DA-1A 4 SCS Runoff DA-1B 5 SCS Runoff DA-2 6 SCS Runoff DA-3 (Impervious) 7 SCS Runoff DA-3 (Pervious) 8 Combine DA-3 9 SCS Runoff DA-4 (Impervious) 10 SCS Runoff DA-4 (Pervious) 11 Combine DA-4 12 SCS Runoff DA-5 (Impervious) 13 SCS Runoff DA-5 (Pervious) 19 14 Combine DA-5 15 SCS Runoff DA-6 16 Combine To Basin #1 17 Reservoir Basin #1 18 Combine Combined - SS Southern Driveway 19 Combine Total Offsite Project: Existing Conditions.gpw Wednesday, 11 / 2 / 2022

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

3 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 2.479 3 723 9,603 ------ ------ ------ DA-1A (Impervious) 2 SCS Runoff 4.032 3 729 18,052 ------ ------ ------ DA-1A (Pervious) 3 Combine 6.121 3 726 27,655 1, 2 ------ ------ DA-1A 4 SCS Runoff 0.172 3 729 755 ------ ------ ------ DA-1B 5 SCS Runoff 0.429 3 729 1,888 ------ ------ ------ DA-2 6 SCS Runoff 5.917 3 723 22,917 ------ ------ ------ DA-3 (Impervious) 7 SCS Runoff 1.361 3 729 6,384 ------ ------ ------ DA-3 (Pervious) 8 Combine 6.988 3 726 29,300 6, 7 ------ ------ DA-3 9 SCS Runoff 0.085 3 723 327 ------ ------ ------ DA-4 (Impervious) 10 SCS Runoff 1.365 3 726 4,731 ------ ------ ------ DA-4 (Pervious) 11 Combine 1.447 3 726 5,058 9, 10 ------ ------ DA-4 12 SCS Runoff 1.521 3 723 5,893 ------ ------ ------ DA-5 (Impervious) 13 SCS Runoff 0.039 3 795 1,059 ------ ------ ------ DA-5 (Pervious) 14 Combine 1.521 3 723 6,952 12, 13 ------ ------ DA-5 15 SCS Runoff 9.664 3 723 37,430 ------ ------ ------ DA-6 16 Combine 6.280 3 726 28,410 3, 4, ------ ------ To Basin #1 17 Reservoir 1.473 3 765 28,403 16

DA-6 16 Combine 6.280 3 726 28,410 3, 4, ------ ------ To Basin #1 17 Reservoir 1.473 3 765 28,403 16 419.06 10,296 Basin #1 18 Combine 7.343 3 726 57,703 8, 17 ------ ------ Combined - SS Southern Driveway 19 Combine 20.08 3 723 109,031 5, 11, 14, ------ ------ Total Offsite 15, 18 Existing Conditions.gpw Return Period: 2 Year Wednesday, 11 / 2 / 2022

4 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2023 Wednesday, 11 / 2 / 2022 Hyd. No. 1 DA-1A (Impervious) Hydrograph type = SCS Runoff Peak discharge = 2.479 cfs Storm frequency = 2 yrs Time to peak = 12.05 hrs Time interval = 3 min Hyd. volume = 9,603 cuft Drainage area = 0.880 ac Curve number = 98 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 6.00 min Total precip. = 3.44 in Distribution = Custom Storm duration = S:\Petry Engineering Cad Projects\2019\19 Shape factor 0265 Daughters = 484 of Israel - West Oran DA-1A (Impervious) Q (cfs) Q (cfs) Hyd. No. 1 -- 2 Year 3.00 3.00 2.00 2.00 1.00 1.00 0.00 0.00 0 3 6 9 12 15 18 21 24 27 Time (hrs) Hyd No. 1