2025 12 19 Stormwater Report Rev 1

1 Watershed Model Schematic Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 1 2 3 4 5 6 Legend Hyd. Origin Description 1 SCS Runoff DA-1 Pervious 2 SCS Runoff DA-1 Impervious 3 SCS Runoff DA-2 Pervious 4 SCS Runoff DA-2 Impervious 5 Combine DA-1 Combined 6 Combine DA-2 Combined Project: Existing - Current Adjusted.gpw Tuesday, 12 / 23 / 2025

2 Hydrograph Return Period Recap Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 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 ------ ------- 1.749 ------- ------- 3.502 ------- ------- 7.132 DA-1 Pervious 2 SCS Runoff ------ ------- 7.590 ------- ------- 11.85 ------- ------- 20.28 DA-1 Impervious 3 SCS Runoff ------ ------- 0.180 ------- ------- 0.361 ------- ------- 0.734 DA-2 Pervious 4 SCS Runoff ------ ------- 0.091 ------- ------- 0.143 ------- ------- 0.244 DA-2 Impervious 5 Combine 1, 2, ------- 9.339 ------- ------- 15.35 ------- ------- 27.41 DA-1 Combined 6 Combine 3, 4, ------- 0.271 ------- ------- 0.503 ------- ------- 0.978 DA-2 Combined Proj. file: Existing - Current Adjusted.gpw Tuesday, 12 / 23 / 2025

3 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 1.749 6 732 7,463 ------ ------ ------ DA-1 Pervious 2 SCS Runoff 7.590 6 732 36,568 ------ ------ ------ DA-1 Impervious 3 SCS Runoff 0.180 6 732 768 ------ ------ ------ DA-2 Pervious 4 SCS Runoff 0.091 6 732 441 ------ ------ ------ DA-2 Impervious 5 Combine 9.339 6 732 44,031 1, 2, ------ ------ DA-1 Combined 6 Combine 0.271 6 732 1,209 3, 4, ------ ------ DA-2 Combined Existing - Current Adjusted.gpw Return Period: 2 Year Tuesday, 12 / 23 / 2025

4 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 Tuesday, 12 / 23 / 2025 Hyd. No. 1 DA-1 Pervious Hydrograph type = SCS Runoff Peak discharge = 1.749 cfs Storm frequency = 2 yrs Time to peak = 12.20 hrs Time interval = 6 min Hyd. volume = 7,463 cuft Drainage area = 1.360 ac Curve number = 80 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 13.60 min Total precip. = 3.47 in Distribution = Custom Storm duration = S:\Petry Engineering Cad Projects\2024\24-170 Shape factor - Baginski = 484 - Manor - West Orange DA-1 Pervious Q (cfs) Q (cfs) Hyd. No. 1 -- 2 Year 2.00 2.00 1.00 1.00 0.00 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 26 Time (hrs) Hyd No. 1

5 Precipitation Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 Tuesday, 12 / 23 / 2025 Hyd. No. 1 DA-1 Pervious Storm Frequency = 2 yrs Time interval = 6 min Total precip. = 3.4700 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. 1 : DA-1 Pervious - 2 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 0.15 0.10 0.10 0.05 0.05 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

6 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 Tuesday, 12 / 23 / 2025 Hyd. No. 2 DA-1 Impervious Hydrograph type = SCS Runoff Peak discharge = 7.590 cfs Storm frequency = 2 yrs Time to peak = 12.20 hrs Time interval = 6 min Hyd. volume = 36,568 cuft Drainage area = 3.320 ac Curve number = 98 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 13.60 min Total precip. = 3.47 in Distribution = Custom Storm duration = S:\Petry Engineering Cad Projects\2024\24-170 Shape factor - Baginski = 484 - Manor - West Orange DA-1 Impervious Q (cfs) Q (cfs) Hyd. No. 2 -- 2 Year 8.00 8.00 6.00 6.00 4.00 4.00 2.00 2.00 0.00 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 26 Time (hrs) Hyd No. 2

7 Precipitation Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 Tuesday, 12 / 23 / 2025 Hyd. No. 2 DA-1 Impervious Storm Frequency = 2 yrs Time interval = 6 min Total precip. = 3.4700 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. 2 : DA-1 Impervious - 2 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 0.15 0.10 0.10 0.05 0.05 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

8 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 Tuesday, 12 / 23 / 2025 Hyd. No. 3 DA-2 Pervious Hydrograph type = SCS Runoff Peak discharge = 0.180 cfs Storm frequency = 2 yrs Time to peak = 12.20 hrs Time interval = 6 min Hyd. volume = 768 cuft Drainage area = 0.140 ac Curve number = 80 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 11.80 min Total precip. = 3.47 in Distribution = Custom Storm duration = S:\Petry Engineering Cad Projects\2024\24-170 Shape factor - Baginski = 484 - Manor - West Orange DA-2 Pervious Q (cfs) Q (cfs) Hyd. No. 3 -- 2 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