PB 22 10 Altera 769 LLC Filed Application with Exhibits Final Site Plan Phase 2

Date: 6/14/2022 Project: Altera Project No: 2530-99-006 1904 Main Street, Lake Como, NJ 07719 Calculated By: SDP (732) 974-0198 Checked By: RJC Worksheet 3: Time of Concentration (T c ) Calculations Land Condition: Proposed Drainage Area: DA-2B DET • Sheet Flow : AB BC Woods, Light Woods, Light 1. Surface Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Underbrush Underbrush 2. Manning's Roughness Coefficient, n . . . . . . . . . . . . . . . . . . . . . . 0.4 0.4 3. Flow Length, L { total L ≤ 100 ft } . . . . . . . . . . . . . . . . . . . . . . . 12.0 ft 88.0 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) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.333 ft/ft 0.068 ft/ft 0.007 (n L ) 0.8 6. Travel Time, T t = . . . . . . . . . . . . . . . . . . . . . . . 0.021 hr + 0.191 hr + 0.000 hr = 0.211 hr p 2 0.5 s 0.4 • Shallow Concentrated Flow : CD DE EF 7. Surface Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unpaved Paved Paved 8. Flow Length, L . . . . . . . .

EF 7. Surface Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unpaved Paved Paved 8. Flow Length, L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45.0 ft 105.0 ft 35.0 ft 9. Watercourse Slope, s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.068 ft/ft 0.086 ft/ft 0.057 ft/ft 10. Average velocity, V { see Figure 3.1) . . . . . . . . . . . . . . . . . . . . . . 4.21 ft/s 5.95 ft/s 4.86 ft/s 11. Travel Time, T t = L . . . . . . . . . . . . . . . . . . . . . . . 0.003 hr + 0.005 hr + 0.002 hr = 0.010 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 } . . . . . . . . . . . . . . . . . . . . . . . . . 0.221 hr

in steps 6, 11 and 21 } . . . . . . . . . . . . . . . . . . . . . . . . . 0.221 hr 13.3 min 1