V4 11 Stormwater Report Rev 3 1 26 2023

7 PETRY %9° eNGINEERING, LLCO Time of Concentration Calculations Project #: 20-0265 Pre-Development Project: Daughters of Israel Post-Development oO County: Essex Drainage Area: DA-2 Sheet Flow Segment 1 Segment 2 Segment3_ a Woods, Light Surface Description (Table 3-1) Un eee 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) 0.13 T, 9.80 - - Shallow Concentrated Flow ~ Segment 1 Segment 2 Segment 3 Surface Description Unpaved Unpaved Flow Length, L 66 63 Watercourse Slope, s 0.11 0.22 Average Velocity 5.3 Lo - T, 0.21 0.14 - 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, « “ 9.80 0.35 0.00 10.14