V4 11 Stormwater Report Rev 3 1 26 2023

® PETRY°@ EncineEcRING, LLC Time of Concentration Calculations Pre-Development Post-Development Qo Project #: 20-0265 Project: Daughters of Israel County: Essex Drainage Area: DA-1 TOC Line 1 Sheet Flow Segment 1 Segment 2 Segment 3 oe Woods, Light Woods, Light Surface Description (Table 3-1) Grass, Dense Grasses Sena Hee Manning's Roughness Coeff., n (Table 3- 0.24 0.4 0.4 Flow Length, L (total < 100 ft) 23 51 26 Two-Year 24-Hour Rainfall, P, 3.44 3.44 3.44 Land Slope, s (ft/ft) 0.04 0.08 0.46 T 3.22 6.94 2.01 Shallow Concentrated Flow — — Segment 1 Segment 2 Segment 3 Surface Description Unpaved Unpaved. paved Flow Length, L 345 185 157 Watercourse Slope, s 0.31 0.06 0.04 Average Velocity 8.9 3.9 41 T, 0.65 0.79 0.64 Channel Flow Segment 1 Segment 2 Segment 3 Cross Sectional Flow Area, a Wetted Perimeter, P,, Hydraulic Radius, r Channel Slope, s Manning's Roughness Description Manning's Roughness Velocity Flow Length T, 12.17 2.08 0.00 14.25