2025 12 19 Stormwater Report Rev 1

10 7.24 6.04 5.21 4.59 4.12 3.74 3.43 3.17 2.95 2.77 2.60 2.46 25 8.25 6.95 6.03 5.34 4.80 4.38 4.02 3.73 3.48 3.26 3.07 2.91 50 9.04 7.65 6.66 5.92 5.34 4.87 4.49 4.16 3.88 3.65 3.44 3.25 100 9.83 8.36 7.30 6.50 5.87 5.36 4.94 4.59 4.29 4.03 3.80 3.60 Tc = time in minutes. Values may exceed 60. Projects\2024\24-170 - Baginski - Manor - West Orange\Civil\Current\Stormwater\Essex County - Current Adjusted.pcp Rainfall Precipitation Table (in) Storm Distribution 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr SCS 24-hour 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 SCS 6-Hr 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-1st 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-2nd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-3rd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-4th 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Huff-Indy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Custom 0.00 3.47 0.00 0.00 5.38 0.00 0.00 9.18

EXISTING CONDITIONS FUTURE PROJECTED HYDROGRAPHS

Hydraflow Table of Contents Existing - Future Projected.gpw Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 Tuesday, 12 / 23 / 2025 Watershed Model Schematic...................................................................................... 1 Hydrograph Return Period Recap............................................................................. 2 2 - Year Summary Report......................................................................................................................... 3 Hydrograph Reports................................................................................................................... 4 Hydrograph No. 1, SCS Runoff, DA-1 Pervious....................................................................... 4 Precipitation Report............................................................................................................. 5 Hydrograph No. 2, SCS Runoff, DA-1 Impervious................................................................... 6 Precipitation Report............................................................................................................. 7 Hydrograph No. 3, SCS Runoff, DA-2 Pervious....................................................................... 8 Precipitation Report............................................................................................................. 9 Hydrograph No. 4, SCS Runoff, DA-2 Impervious................................................................. 10 Precipitation Report........................................................................................................... 11 Hydrograph No. 5, Combine, DA-1 Combined....................................................................... 12 Hydrograph No. 6, Combine, DA-2 Combined....................................................................... 13 10 - Year Summary Report....................................................................................................................... 14 Hydrograph

.................... 13 10 - Year Summary Report....................................................................................................................... 14 Hydrograph Reports................................................................................................................. 15 Hydrograph No. 1, SCS Runoff, DA-1 Pervious..................................................................... 15 Precipitation Report........................................................................................................... 16 Hydrograph No. 2, SCS Runoff, DA-1 Impervious................................................................. 17 Precipitation Report........................................................................................................... 18 Hydrograph No. 3, SCS Runoff, DA-2 Pervious..................................................................... 19 Precipitation Report........................................................................................................... 20 Hydrograph No. 4, SCS Runoff, DA-2 Impervious................................................................. 21 Precipitation Report........................................................................................................... 22 Hydrograph No. 5, Combine, DA-1 Combined....................................................................... 23 Hydrograph No. 6, Combine, DA-2 Combined....................................................................... 24 100 - Year Summary Report....................................................................................................................... 25 Hydrograph Reports................................................................................................................. 26 Hydrograph No. 1, SCS Runoff, DA-1 Pervious..................................................................... 26 Precipitation Report........................................................................................................... 27 Hydrograph No. 2, SCS Runoff, DA-1 Impervious................................................................. 28 Precipitation

............................................... 27 Hydrograph No. 2, SCS Runoff, DA-1 Impervious................................................................. 28 Precipitation Report........................................................................................................... 29 Hydrograph No. 3, SCS Runoff, DA-2 Pervious..................................................................... 30 Precipitation Report........................................................................................................... 31 Hydrograph No. 4, SCS Runoff, DA-2 Impervious................................................................. 32 Precipitation Report........................................................................................................... 33 Hydrograph No. 5, Combine, DA-1 Combined....................................................................... 34 Hydrograph No. 6, Combine, DA-2 Combined....................................................................... 35 IDF Report.................................................................................................................. 36

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 - Future Projected.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 ------ ------- 2.304 ------- ------- 4.442 ------- ------- 9.365 DA-1 Pervious 2 SCS Runoff ------ ------- 8.974 ------- ------- 14.04 ------- ------- 25.46 DA-1 Impervious 3 SCS Runoff ------ ------- 0.237 ------- ------- 0.457 ------- ------- 0.964 DA-2 Pervious 4 SCS Runoff ------ ------- 0.108 ------- ------- 0.169 ------- ------- 0.307 DA-2 Impervious 5 Combine 1, 2, ------- 11.28 ------- ------- 18.49 ------- ------- 34.83 DA-1 Combined 6 Combine 3, 4, ------- 0.345 ------- ------- 0.627 ------- ------- 1.271 DA-2 Combined Proj. file: Existing - Future Projected.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 2.304 6 732 9,795 ------ ------ ------ DA-1 Pervious 2 SCS Runoff 8.974 6 732 43,554 ------ ------ ------ DA-1 Impervious 3 SCS Runoff 0.237 6 732 1,008 ------ ------ ------ DA-2 Pervious 4 SCS Runoff 0.108 6 732 525 ------ ------ ------ DA-2 Impervious 5 Combine 11.28 6 732 53,349 1, 2, ------ ------ DA-1 Combined 6 Combine 0.345 6 732 1,533 3, 4, ------ ------ DA-2 Combined Existing - Future Projected.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 = 2.304 cfs Storm frequency = 2 yrs Time to peak = 12.20 hrs Time interval = 6 min Hyd. volume = 9,795 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. = 4.09 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 3.00 3.00 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. = 4.0900 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