2022 10 Drainage Statement Signed

TIME OF CONCENTRATION (TC) CALCULATIONS

Date: 10/21/2022 Project: Proposed Popeyes & Fast Food Restaurant Project No: 1021-99-025 1904 Main Street, Lake Como, NJ 07719 Calculated By: DG (732) 974-0198 Checked By: MB Worksheet 3: Time of Concentration (T c ) Calculations Land Condition: Existing Drainage Area: Site • Sheet Flow : AB Smooth 1. Surface Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Surfaces 2. Manning's Roughness Coefficient, n . . . . . . . . . . . . . . . . . . . . . . 0.011 3. Flow Length, L { total L ≤ 100 ft } . . . . . . . . . . . . . . . . . . . . . . . 100.0 ft 4. Two-Year 24-hour Rainfall, p 2 for . . . Essex County . . . . 3.44 in 5. Land Slope, s (ft/ft) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.022 ft/ft 0.007 (n L ) 0.8 6. Travel Time, T t = . . . . . . . . . . . . . . . . . .0.019 . . . . .hr + 0.000 hr + 0.000 hr = 0.019 hr p 2 0.5 s 0.4 • Shallow Concentrated Flow : BC 7. Surface Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Paved 8. Flow Length, L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94.0 ft 9. Watercourse Slope, s . . . . .

. . . . . . . . . . . . . . . . . . Paved 8. Flow Length, L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94.0 ft 9. Watercourse Slope, s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.462 ft/ft 10. Average velocity, V { see Figure 3.1) . . . . . . . . . . . . . . . . . . . . . . 13.82 ft/s 11. Travel Time, T t = L . . . . . . . . . . . . . . . . . .0.002 . . . . .hr + 0.000 hr + 0.000 hr = 0.002 hr 3600 V • Channel Flow : 12. Pipe Diameter, D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13. Cross-Sectional Flow Area, A . . . . . . . . . . . . . . . . . . . . . . . . . 14. Wetted Perimeter, p w . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15. Hydraulic Radius, r = A / p w . . . . . . . . . . . . . . . . . . . . . . . . . . 16. Channel Slope, s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17. Pipe Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18. Manning's Roughness Coefficient, n . . . . . . . . . . . . . . . . . . . . . 1.49 r 2/3 s 1/2 19. Velocity, V = ..................... n 20. Flow Length, L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21. Travel Time, T t = L . . . . . . . . . . . . . . . . . .0.000 . . . . .hr . . . +. . . 0.000 . . . . . hr . . . .+ 0.000 hr = 0.000 hr 3600 V 22. Watershed or subarea Time of Concentration, T c { add T t in steps 6, 11 and 21 } . . . . . . . . . . . . .

.+ 0.000 hr = 0.000 hr 3600 V 22. Watershed or subarea Time of Concentration, T c { add T t in steps 6, 11 and 21 } . . . . . . . . . . . . . . . . . . . . . . . . . 0.021 hr 1.2 min

Date: 10/21/2022 Project: Proposed Popeyes & Fast Food Restaurant Project No: 1021-99-025 1904 Main Street, Lake Como, NJ 07719 Calculated By: DG (732) 974-0198 Checked By: MB Worksheet 3: Time of Concentration (T c ) Calculations Land Condition: Proposed Drainage Area: Site • Sheet Flow : AB Smooth 1. Surface Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Surfaces . 2. Manning's Roughness Coefficient, n . . . . . . . . . . . . . . . . . . . 0.011 ... 3. Flow Length, L { total L ≤ 100 ft } . . . . . . . . . . . . . . . . . . . . 100.0 . . . ft 4. Two-Year 24-hour Rainfall, p 2 for . . .Essex County. . . . 3.44 in 3.44 in 3.44 in 5. Land Slope, s (ft/ft) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ft/ft 0.024 0.007 (n L ) 0.8 6. Travel Time, T t = . . . . . . . . . . . . . . . .0.018 . . . . .hr .. + 0.000 hr + 0.000 hr = 0.018 hr p 2 0.5 s 0.4 • Shallow Concentrated Flow : BC 7. Surface

= 0.018 hr p 2 0.5 s 0.4 • Shallow Concentrated Flow : BC 7. Surface Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Paved . 8. Flow Length, L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111.0 . ft 9. Watercourse Slope, s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.031 .. ft/ft 10. Average velocity, V { see Figure 3.1) . . . . . . . . . . . . . . . . . 3.60 . . . . ft/s . 11. Travel Time, T t = L . . . . . . . . . . . . . . . .0.009 . . . . .hr .. + 0.000 hr + 0.000 hr = 0.009 hr 3600 V • Channel Flow : CD 12. Pipe Diameter, D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 in 13. Cross-Sectional Flow Area, A . . . . . . . . . . . . . . . . . . . . . . . 0.785 .. sf 14. Wetted Perimeter, p w . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.1 ft 15. Hydraulic Radius, r = A / p w . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 . ft 16. Channel Slope, s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.035 .. ft/ft 17. Pipe Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RCP 18. Manning's Roughness Coefficient, n . . . . . . . . . . . . . . . . . . . 0.013 .. 1.49 r 2/3 s 1/2 19. Velocity, V = . . . . . . . . . . . . . . . . . .8.46

. . . . . 0.013 .. 1.49 r 2/3 s 1/2 19. Velocity, V = . . . . . . . . . . . . . . . . . .8.46 . . . ft/s n 20. Flow Length, L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50.0.... 21. Travel Time, T t = L . . . . . . . . . . . . . . . .0.002 . . . . .hr . . .+ . . . 0.000 . . . . . hr . . . .+. . 0.000 hr = 0.002 hr 3600 V 22. Watershed or subarea Time of Concentration, T c { add T t in steps 6, 11 and 21 } . . . . . . . . . . . . . . . . . . . . . . . . . 0.028 hr 1.7 min 1

RUNOFF CURVE NUMBER (CN) CALCULATIONS – EXISTING

Project: Proposed Popeye's & Fast Food Restaurant Computed By: DG Job #: 1021-99-025 Checked By: MB Location: West Orange, NJ Date: 10/21/2022 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 6 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