V4 11 Stormwater Report Rev 3 1 26 2023

% PET RY @ ENGINEERING, LLG Time of Concentration Calculations Project #: 20-0265 Pre-Development Project: Daughters of Israel Post-Development o County: Essex Drainage Area: DA-1B Sheet Flow ~~ Segment 1 Segment 2 Segment 3 woe Woods, Light Surface Description (Table 3-1) Un oe Manning's Roughness Coeff., n (Table 3- 0.4 - - Flow Length, L (total < 100 ft) 100 Two-Year 24-Hour Rainfall, P, 3.44 3.44 3.44 Land Slope, s (ft/ft) 0.14 T, 9.51 - - 9.51 Shallow Concentrated Flow ~ Segment 1 Segment 2 Segment 3 Surface Description Unpaved Unpaved Unpaved Flow Length, L 51 23 36 Watercourse Slope, s 0.09 0.26 0.72 Average Velocity 48 8.2 13.6 T, 0.18 0.05 0.04 0.27 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 9.78