2023 06 Drainage Statement

Project: Proposed Popeye's & Fast Food Restaurant Computed By: DG Job #: 1021-99-025 Checked By: MB Location: West Orange, NJ Date: 3/30/2023 Drainage Area Impervious Impervious Curve HSG B - HSG B - Curve HSG C - HSG C - 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 0.84 36,782 98 0.07 3,045 61 0.14 5,966 74 70 0.21 1.05 4 Total 0.84 36,782 0.07 3,045 0.14 5,966 0.21 1.05 Per County Soil Survey - URBONB HSG B Soil Urban Land, Boonton substratum, 0 to 8 percent slopes Per County Soil Survey - BouC HSG C Soil Boonton - Urban Land, Boonton substratum complex, 8 to 15 percent slopes Runoff Curve Number (CN) Runoff Curve Number (CN) Description (HSG B) (HSG C) Impervious Surface 98 98 Open Space (lawn) (good) 61 74

RUNOFF CURVE NUMBER (CN) CALCULATIONS – PROPOSED

Project: Proposed Popeyes & Fast Food Restaurant Computed By: DG Job #: 1021-99-025 Checked By: MB Location: West Orange, NJ Date: 7/6/2023 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 0.72 31,512 98 0.24 10,603 74 0.08 3,546 80 76 0.32 1.05 4 Total 0.72 31,512 0.24 7,650 0.08 3,546 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 2023-07-06 2, 10, 100 yr.gpw Hydraflow Hydrographs by Intelisolve v9.1 Friday, Jul 7, 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,

....................................... 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: 2023-07-06 2, 10, 100 yr.gpw Friday, Jul 7, 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 ------- ------- 2.311 ------- ------- 3.528 ------- ------- 5.872 Proposed Site (Impervious) 6 SCS Runoff ------- ------- 0.500 ------- ------- 1.037 ------- ------- 2.150 Proposed Site (Pervious) 7 Combine 5, 6 ------- 2.803 ------- ------- 4.553 ------- ------- 8.012 Proposed Total Proj. file: 2023-07-06 2, 10, 100 yr.gpw Friday, Jul 7, 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 2.311 1 725 8,381 ---- ------ ------ Proposed Site (Impervious) 6 SCS Runoff 0.500 1 726 1,584 ---- ------ ------ Proposed Site (Pervious) 7 Combine 2.803 1 726 9,964 5, 6 ------ ------ Proposed Total 2023-07-06 2, 10, 100 yr.gpw Return Period: 2 Year Friday, Jul 7, 2023

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