2022 10 Drainage Statement Signed

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