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

Date: 6/14/2022 Project: Altera Development Project No: 2530-99-006 1904 Main Street, Lake Como, NJ 07719 Calculated By: SDP (732) 974-0198 Checked By: PAF Worksheet 3: Time of Concentration (T c ) Calculations Land Condition: Existing Drainage Area: DA-2 • Sheet Flow : AB BC CD Woods, Light Woods, Light 1. Surface Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Underbrush Underbrush Woods, Light Underbrush 2. Manning's Roughness Coefficient, n . . . . . . . . . . . . . . . . . . . . . . 0.4 0.4 0.4 3. Flow Length, L { total L ≤ 100 ft } . . . . . . . . . . . . . . . . . . . . . . . 25.0 ft 43.0 ft 32.0 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) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.220 ft/ft 0.023 ft/ft 0.188 ft/ft 0.007 (n L ) 0.8 6. Travel Time, T t = 0.5 0.4 . . . . . . . . . . . . . . . . . . . . . . . 0.044 hr + 0.166 hr + 0.057 hr = 0.266 hr

. . . . . . . . . . . . . . . . . . . . . . . 0.044 hr + 0.166 hr + 0.057 hr = 0.266 hr p2 s • Shallow Concentrated Flow : DE EF FG 7. Surface Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unpaved Unpaved Unpaved 8. Flow Length, L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36.0 ft 15.0 ft 12.0 ft 9. Watercourse Slope, s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.250 ft/ft 0.133 ft/ft 0.083 ft/ft 10. Average velocity, V { see Figure 3.1) . . . . . . . . . . . . . . . . . . . . . . 8.07 ft/s 5.89 ft/s 4.65 ft/s 11. Travel Time, T t = L . . . . . . . . . . . . . . . . . . . . . . . 0.001 hr + 0.001 hr + 0.001 hr = 0.003 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 . . . . . . . . . . . . . . . . . . . . . 2/3 1/2 1.49 r s 19. Velocity, V = ..................... n 20. Flow Length, L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21. Travel Time, T t = L . . . . . . . . . . . . . . . . . . . . . . . . 0.000

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 } . . . . . . . . . . . . . . . . . . . . . . . . . 0.269 hr 16.1 min