V4 11 Stormwater Report Rev 3 1 26 2023

@, oo PET RY° @ ENGINEERING, LLC Time of Concentration Calculations Project #: 20-0265 Project: Daughters of Israel County: Essex Pre-Development Post-Development Oo Drainage Area: DA-3 Sheet Flow — Segment 1 ~ Segment 2 Segment 3 — ws Woods, Light Surface Description (Table 3-1) Ghise DenselGraeses Un ae Manning's Roughness Coeff., n (Table 3- 0.24 0.4 - Flow Length, L (total < 100 ft) 45 55 Two-Year 24-Hour Rainfall, P, 3.44 3.44 3.44 Land Slope, s (ft/ft) 0.11 0.16 T, 3.67 5.59 - 9.26 Shallow Concentrated Flow a _ Segment 1 Segment 2 Segment 3 Surface Description Unpaved Unpaved paved Flow Length, L 140 115 64 Watercourse Slope, s 0.04 0.52 0.03 Average Velocity 3.2 11.5 35 T, 0.73 0.17 0.30 1.20 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, - - - 0.00 10.47