V4 11 Stormwater Report Rev 3 1 26 2023

6 PETRY °9? eNGINEERING, LLCO Time of Concentration Calculations Pre-Development Post-Development oO Project #: 20-0265 Project: Daughters of Israel County: Essex Drainage Area: DA-5 TOC Line 1 Sheet Flow — Segment 1 Segment 2 Segment 3 A Woods, Light Woods, Light Surface Description (Table 3-1) Un pees Un oe Manning's Roughness Coeff., n (Table 3- 0.4 0.4 - Flow Length, L (total < 100 ft) 48 Sy} Two-Year 24-Hour Rainfall, P, 3.44 3.44 3.44 Land Slope, s (ft/ft) 0.08 0.19 T, 6.61 4.99 7 Shallow Concentrated Flow _ Segment 1 a Segment 2 Segment 3 Surface Description Unpaved Unpaved paved Flow Length, L 135 Ail 77 Watercourse Slope, s 0.04 0.17 0.01 Average Velocity 3.2 6.6 2.0 T, 0.71 0.69 0.64 Channel Flow Segment T 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 11.60 2.03 0.00 13.63