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: 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