2025 12 19 Stormwater Report Rev 1

20 Precipitation Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 Tuesday, 12 / 23 / 2025 Hyd. No. 3 DA-2 Pervious Storm Frequency = 10 yrs Time interval = 6 min Total precip. = 5.3800 in Distribution = Custom Storm duration = S:\Petry Engineering Cad Projects\2024\24-170 - Baginski - Manor - West Orang Incremental Rainfall Precipitation Precip (in) Precip (in) Hyd. No. 3 : DA-2 Pervious - 10 Year 1.00 1.00 0.90 0.90 0.80 0.80 0.70 0.70 0.60 0.60 0.50 0.50 0.40 0.40 0.30 0.30 0.20 0.20 0.10 0.10 0.00 0.00 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0

0.00 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 Time (hrs) Custom Design Storm -- S:\Petry Engineering Cad Projects\2024\24-170 - Baginski - Manor - West Orange\Civil\Curre

21 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 Tuesday, 12 / 23 / 2025 Hyd. No. 4 DA-2 Impervious Hydrograph type = SCS Runoff Peak discharge = 0.143 cfs Storm frequency = 10 yrs Time to peak = 12.20 hrs Time interval = 6 min Hyd. volume = 700 cuft Drainage area = 0.040 ac Curve number = 98 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 11.80 min Total precip. = 5.38 in Distribution = Custom Storm duration = S:\Petry Engineering Cad Projects\2024\24-170 Shape factor - Baginski = 484 - Manor - West Orange DA-2 Impervious Q (cfs) Q (cfs) Hyd. No. 4 -- 10 Year 0.50 0.50 0.45 0.45 0.40 0.40 0.35 0.35 0.30 0.30 0.25 0.25 0.20 0.20 0.15

0.25 0.20 0.20 0.15 0.15 0.10 0.10 0.05 0.05 0.00 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 26 Time (hrs) Hyd No. 4

22 Precipitation Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 Tuesday, 12 / 23 / 2025 Hyd. No. 4 DA-2 Impervious Storm Frequency = 10 yrs Time interval = 6 min Total precip. = 5.3800 in Distribution = Custom Storm duration = S:\Petry Engineering Cad Projects\2024\24-170 - Baginski - Manor - West Orang Incremental Rainfall Precipitation Precip (in) Precip (in) Hyd. No. 4 : DA-2 Impervious - 10 Year 1.00 1.00 0.90 0.90 0.80 0.80 0.70 0.70 0.60 0.60 0.50 0.50 0.40 0.40 0.30 0.30 0.20 0.20 0.10 0.10 0.00 0.00 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0

0.00 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 Time (hrs) Custom Design Storm -- S:\Petry Engineering Cad Projects\2024\24-170 - Baginski - Manor - West Orange\Civil\Curre

23 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 Tuesday, 12 / 23 / 2025 Hyd. No. 5 DA-1 Combined Hydrograph type = Combine Peak discharge = 15.35 cfs Storm frequency = 10 yrs Time to peak = 12.20 hrs Time interval = 6 min Hyd. volume = 73,038 cuft Inflow hyds. = 1, 2 Contrib. drain. area = 4.680 ac DA-1 Combined Q (cfs) Q (cfs) Hyd. No. 5 -- 10 Year 18.00 18.00 15.00 15.00 12.00 12.00 9.00 9.00 6.00 6.00 3.00 3.00 0.00 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 26 Time (hrs) Hyd No. 5 Hyd No. 1 Hyd No. 2

24 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 Tuesday, 12 / 23 / 2025 Hyd. No. 6 DA-2 Combined Hydrograph type = Combine Peak discharge = 0.503 cfs Storm frequency = 10 yrs Time to peak = 12.20 hrs Time interval = 6 min Hyd. volume = 2,237 cuft Inflow hyds. = 3, 4 Contrib. drain. area = 0.180 ac DA-2 Combined Q (cfs) Q (cfs) Hyd. No. 6 -- 10 Year 1.00 1.00 0.90 0.90 0.80 0.80 0.70 0.70 0.60 0.60 0.50 0.50 0.40 0.40 0.30 0.30 0.20 0.20 0.10 0.10 0.00

0.10 0.00 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 26 Time (hrs) Hyd No. 6 Hyd No. 3 Hyd No. 4

25 Hydrograph Summary Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 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 7.132 6 732 31,190 ------ ------ ------ DA-1 Pervious 2 SCS Runoff 20.28 6 732 101,003 ------ ------ ------ DA-1 Impervious 3 SCS Runoff 0.734 6 732 3,211 ------ ------ ------ DA-2 Pervious 4 SCS Runoff 0.244 6 732 1,217 ------ ------ ------ DA-2 Impervious 5 Combine 27.41 6 732 132,192 1, 2, ------ ------ DA-1 Combined 6 Combine 0.978 6 732 4,428 3, 4, ------ ------ DA-2 Combined Existing - Current Adjusted.gpw Return Period: 100 Year Tuesday, 12 / 23 / 2025