V4 11 Stormwater Report Rev 3 1 26 2023

Time of Concentration Calculations Project #: 20-0265 Pre-Development Project: Daughters of Israel Post-Development County: Essex Drainage Area: DA-3 Sheet Flow Segment 1 Segment 2 Segment 3 Woods, Light Woods, Light Surface Description (Table 3-1) Grass, Dense Grasses Underbrush Underbrush Manning's Roughness Coeff., n (Table 3-1) 0.24 0.4 0.4 Flow Length, L (total ≤ 100 ft) 23 51 26 Two-Year 24-Hour Rainfall, P2 3.44 3.44 3.44 Land Slope, s (ft/ft) 0.04 0.08 0.46 Tt 3.22 6.94 2.01 12.17 Shallow Concentrated Flow Segment 1 Segment 2 Segment 3 Surface Description Unpaved Unpaved paved Flow Length, L 345 185 207 Watercourse Slope, s 0.31 0.06 0.04 Average Velocity 8.9 3.9 4.1 Tt 0.65 0.79 0.85 2.28 Channel Flow Segment 1 Segment 2 Segment 3 Cross Sectional Flow Area, a Wetted Perimeter, Pw Hydraulic Radius, r - - - Channel Slope, s Manning's Roughness Description Manning's Roughness - - - Velocity - - - Flow Length Tt - - - 0.00 14.46