ZB 22 13 2023 03 Drainage Statement

Project: Proposed Popeyes & Fast Food Restaurant Computed By: JD Job #: 1021-99-025 Checked By: DG Location: West Orange, NJ Date: 3/30/2023 Drainage Area Impervious Impervious Curve HSG C - HSG C - Curve HSG D - HSG D - Curve Avg. Perv. Total Total Area TC (Min.) Area (acre) Area (sf) Number Open Open Number Open Open Number Curve Pervious (acres) (CN) Used Space Area Space Area (CN) Used Space Area Space Area (CN) Used Number Area (acre) (sf) (acre) (sf) (acres) Study Area Site 0.73 31,808 98 0.24 10,603 74 0.07 3,250 80 75 0.32 1.05 4 Total 0.73 31,808 0.24 7,650 0.07 3,250 0.32 1.05 Per County Soil Survey - BouC HSG C Soil Boonton - Urban Land, Boonton substratum complex, 8 to 15 percent slopes Per County Soil Survey - URBONB HSG D Soil Urban Land, Boonton substratum, 0 to 8 percent slopes Runoff Curve Number (CN) Runoff Curve Number (CN) Description (HSG C) (HSG D) Impervious Surface 98 98 Open Space (lawn) (good) 74 80

HYDROGRAPH SUMMARY REPORTS – EXISTING AND PROPOSED CONDITIONS 2 YR. 10 YR. & 100 YR.

Hydraflow Table of Contents 2023-04-03 2, 10, 100 yr.gpw Hydraflow Hydrographs by Intelisolve v9.1 Wednesday, Apr 5, 2023 Watershed Model Schematic ................................................................................... 1 Hydrograph Return Period Recap ........................................................................... 2 2 - Year Summary Report ....................................................................................................................... 3 Hydrograph Reports ................................................................................................................. 4 Hydrograph No. 1, SCS Runoff, Existing Site (Impervious) .................................................... 4 Hydrograph No. 2, SCS Runoff, Existing Site (Pervious) ....................................................... 5 Hydrograph No. 3, Combine, Existing Total ............................................................................ 6 Hydrograph No. 5, SCS Runoff, Proposed Site (Impervious) ................................................. 7 Hydrograph No. 6, SCS Runoff, Proposed Site (Pervious) .................................................... 8 Hydrograph No. 7, Combine, Proposed Total ......................................................................... 9 10 - Year Summary Report ..................................................................................................................... 10 Hydrograph Reports ............................................................................................................... 11 Hydrograph No. 1, SCS Runoff, Existing Site (Impervious) .................................................. 11 Hydrograph No. 2, SCS Runoff, Existing Site (Pervious) ..................................................... 12 Hydrograph No. 3, Combine, Existing Total .......................................................................... 13 Hydrograph No. 5, SCS Runoff, Proposed Site (Impervious) ............................................... 14 Hydrograph No. 6, SCS Runoff, Proposed

.............................. 13 Hydrograph No. 5, SCS Runoff, Proposed Site (Impervious) ............................................... 14 Hydrograph No. 6, SCS Runoff, Proposed Site (Pervious) .................................................. 15 Hydrograph No. 7, Combine, Proposed Total ....................................................................... 16 100 - Year Summary Report ..................................................................................................................... 17 Hydrograph Reports ............................................................................................................... 18 Hydrograph No. 1, SCS Runoff, Existing Site (Impervious) .................................................. 18 Hydrograph No. 2, SCS Runoff, Existing Site (Pervious) ..................................................... 19 Hydrograph No. 3, Combine, Existing Total .......................................................................... 20 Hydrograph No. 5, SCS Runoff, Proposed Site (Impervious) ............................................... 21 Hydrograph No. 6, SCS Runoff, Proposed Site (Pervious) .................................................. 22 Hydrograph No. 7, Combine, Proposed Total ....................................................................... 23 IDF Report ............................................................................................................... 24

1 Watershed Model Schematic Hydraflow Hydrographs by Intelisolve v9.1 Legend Hyd. Origin Description 1 SCS Runoff Existing Site (Impervious) 2 SCS Runoff Existing Site (Pervious) 3 Combine Existing Total 5 SCS Runoff Proposed Site (Impervious) 6 SCS Runoff Proposed Site (Pervious) 7 Combine Proposed Total Project: 2023-04-03 2, 10, 100 yr.gpw Wednesday, Apr 5, 2023

2 Hydrograph Return Period Recap Hydraflow Hydrographs by Intelisolve v9.1 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 ------- ------- 2.696 ------- ------- 4.116 ------- ------- 6.851 Existing Site (Impervious) 2 SCS Runoff ------- ------- 0.224 ------- ------- 0.533 ------- ------- 1.215 Existing Site (Pervious) 3 Combine 1, 2 ------- 2.913 ------- ------- 4.640 ------- ------- 8.056 Existing Total 5 SCS Runoff ------- ------- 2.343 ------- ------- 3.577 ------- ------- 5.953 Proposed Site (Impervious) 6 SCS Runoff ------- ------- 0.460 ------- ------- 0.973 ------- ------- 2.048 Proposed Site (Pervious) 7 Combine 5, 6 ------- 2.795 ------- ------- 4.538 ------- ------- 7.991 Proposed Total Proj. file: 2023-04-03 2, 10, 100 yr.gpw Wednesday, Apr 5, 2023

3 Hydrograph Summary Report Hydraflow Hydrographs by Intelisolve v9.1 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 2.696 1 725 9,778 ---- ------ ------ Existing Site (Impervious) 2 SCS Runoff 0.224 1 726 740 ---- ------ ------ Existing Site (Pervious) 3 Combine 2.913 1 725 10,518 1, 2 ------ ------ Existing Total 5 SCS Runoff 2.343 1 725 8,497 ---- ------ ------ Proposed Site (Impervious) 6 SCS Runoff 0.460 1 726 1,463 ---- ------ ------ Proposed Site (Pervious) 7 Combine 2.795 1 726 9,960 5, 6 ------ ------ Proposed Total 2023-04-03 2, 10, 100 yr.gpw Return Period: 2 Year Wednesday, Apr 5, 2023

4 Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.1 Wednesday, Apr 5, 2023 Hyd. No. 1 Existing Site (Impervious) Hydrograph type = SCS Runoff Peak discharge = 2.696 cfs Storm frequency = 2 yrs Time to peak = 725 min Time interval = 1 min Hyd. volume = 9,778 cuft Drainage area = 0.840 ac Curve number = 98 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = USER Time of conc. (Tc) = 4.00 min Total precip. = 3.44 in Distribution = Custom Storm duration = NOAA Atlas 14 Type-D.cds Shape factor = 484 Existing Site (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 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Time (min) Hyd No. 1

5 Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.1 Wednesday, Apr 5, 2023 Hyd. No. 2 Existing Site (Pervious) Hydrograph type = SCS Runoff Peak discharge = 0.224 cfs Storm frequency = 2 yrs Time to peak = 726 min Time interval = 1 min Hyd. volume = 740 cuft Drainage area = 0.210 ac Curve number = 70 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = USER Time of conc. (Tc) = 4.00 min Total precip. = 3.44 in Distribution = Custom Storm duration = NOAA Atlas 14 Type-D.cds Shape factor = 484 Existing Site (Pervious) Q (cfs) Q (cfs) Hyd. No. 2 -- 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

0.20 0.15 0.15 0.10 0.10 0.05 0.05 0.00 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Time (min) Hyd No. 2