2025 12 19 Stormwater Report Rev 1

36 Hydraflow Rainfall Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 Tuesday, 12 / 23 / 2025 Return Intensity-Duration-Frequency Equation Coefficients (FHA) Period (Yrs) B D E (N/A) 1 0.0000 0.0000 0.0000 -------- 2 69.8703 13.1000 0.8658 -------- 3 0.0000 0.0000 0.0000 -------- 5 79.2597 14.6000 0.8369 -------- 10 88.2351 15.5000 0.8279 -------- 25 102.6072 16.5000 0.8217 -------- 50 114.8193 17.2000 0.8199 -------- 100 127.1596 17.8000 0.8186 -------- File name: SampleFHA.idf Intensity = B / (Tc + D)^E Return Intensity Values (in/hr) Period (Yrs) 5 min 10 15 20 25 30 35 40 45 50 55 60 1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 5.69 4.61 3.89 3.38 2.99 2.69 2.44 2.24 2.07 1.93 1.81 1.70 3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 6.57 5.43 4.65 4.08 3.65 3.30 3.02 2.79 2.59 2.42 2.27 2.15 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

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

PROPOSED CONDITIONS FUTURE PROJECTED HYDROGRAPHS

Hydraflow Table of Contents Proposed - 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-1 Pervious....................................................................... 8 Precipitation Report............................................................................................................. 9 Hydrograph No. 4, SCS Runoff, DA-2 Impervious................................................................. 10 Precipitation Report........................................................................................................... 11 Hydrograph No. 5, Combine, <no description>...................................................................... 12 Hydrograph No. 6, Combine, <no description>...................................................................... 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-1 Pervious..................................................................... 19 Precipitation Report........................................................................................................... 20 Hydrograph No. 4, SCS Runoff, DA-2 Impervious................................................................. 21 Precipitation Report........................................................................................................... 22 Hydrograph No. 5, Combine, <no description>...................................................................... 23 Hydrograph No. 6, Combine, <no description>...................................................................... 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-1 Pervious..................................................................... 30 Precipitation Report........................................................................................................... 31 Hydrograph No. 4, SCS Runoff, DA-2 Impervious................................................................. 32 Precipitation Report........................................................................................................... 33 Hydrograph No. 5, Combine, <no description>...................................................................... 34 Hydrograph No. 6, Combine, <no description>...................................................................... 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-1 Pervious 4 SCS Runoff DA-2 Impervious 5 Combine <no description> 6 Combine <no description> Project: Proposed - 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 ------ ------- 2.693 ------- ------- 5.194 ------- ------- 10.95 DA-1 Pervious 2 SCS Runoff ------ ------- 8.352 ------- ------- 13.07 ------- ------- 23.70 DA-1 Impervious 3 SCS Runoff ------ ------- 0.237 ------- ------- 0.457 ------- ------- 0.964 DA-1 Pervious 4 SCS Runoff ------ ------- 0.108 ------- ------- 0.169 ------- ------- 0.307 DA-2 Impervious 5 Combine 1, 2, ------- 11.05 ------- ------- 18.27 ------- ------- 34.65 <no description> 6 Combine 3, 4, ------- 0.345 ------- ------- 0.627 ------- ------- 1.271 <no description> Proj. file: Proposed - 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 2.693 6 732 11,451 ------ ------ ------ DA-1 Pervious 2 SCS Runoff 8.352 6 732 40,537 ------ ------ ------ DA-1 Impervious 3 SCS Runoff 0.237 6 732 1,008 ------ ------ ------ DA-1 Pervious 4 SCS Runoff 0.108 6 732 525 ------ ------ ------ DA-2 Impervious 5 Combine 11.05 6 732 51,988 1, 2, ------ ------ <no description> 6 Combine 0.345 6 732 1,533 3, 4, ------ ------ <no description> Proposed - 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 = 2.693 cfs Storm frequency = 2 yrs Time to peak = 12.20 hrs Time interval = 6 min Hyd. volume = 11,451 cuft Drainage area = 1.590 ac Curve number = 80 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 11.70 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