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: 1 Sheet Flow Segment 1 Segment 2 Segment 3 Smooth Surfaces Surface Description (Table 3-1) (Concrete. Asphalt, Grass, Dense Grasses Gravel, or Bare Soil) Grass, Dense Grasses Manning's Roughness Coeff., n (Table 3-1) 0.24 0.011 0.24 Flow Length, L (total ≤ 100 ft) 16 32 9 Two-Year 24-Hour Rainfall, P2 3.44 3.44 3.44 Land Slope, s (ft/ft) 0.01 0.01 0.01 Tt 4.19 0.62 2.65 7.46 Shallow Concentrated Flow Segment 1 Segment 2 Segment 3 Surface Description Flow Length, L Watercourse Slope, s Average Velocity - - - Tt - - - 0.00 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 7.46