V4 11 Stormwater Report Rev 3 1 26 2023

Type "B" #1-7A Type "B" #1-7 0.24 0.75 0.18 6.0 5.60 1.01 1.01 2.0% 15" HDPE 10.83 8.82 0.00 Type "B" #1-7 Type "B" #1-6 0.11 0.99 0.11 6.0 5.60 0.61 11.18 2.5% 15" HDPE 12.10 9.86 0.00 Type "B" #1-6A Type "B" #1-6 0.15 0.75 0.11 6.0 5.60 0.63 0.63 2.0% 15" HDPE 10.83 8.82 0.00 Type "B" #1-6 Type "B" #1-5 0.05 0.99 0.05 6.0 5.60 0.28 12.09 2.5% 18" HDPE 18.04 10.21 0.00 Type "B" #1-5A Type "B" #1-5 0.08 0.99 0.08 6.0 5.60 0.44 0.44 2.0% 15" HDPE 10.83 8.82 0.00 Type "B" #2-2 Type "B" #1-5 0.58 0.99 0.57 6.0 5.60 3.22 3.22 2.5% 15" HDPE 12.10 9.86 0.00 Type "B" #1-5 Type "B" #1-3 0.06 0.99 0.06 6.0 5.60 0.33 16.08 2.5% 18" HDPE 18.04 10.21 0.00 Type "B" #1-3A Type "B" #1-3 0.22 0.99 0.22 6.0 5.60 1.22 1.22 2.0% 15" HDPE 10.83 8.82 0.00 Type "B" #1-3 Type "B" #1-2 0.04 0.99 0.04 6.0 5.60 0.22 17.52 2.5% 18" HDPE 18.04 10.21 0.00 Type "B" #1-2A Type "B" #1-2 0.17 0.99 0.17 6.0 5.60 0.94 0.94 2.0% 15" HDPE 10.83 8.82 0.00

Type "B" #1-2 MH #1-1 0.02 0.99 0.02 6.0 5.60 0.11 18.57 2.0% 24" HDPE 34.75 11.06 0.00 EX. MH in Pleasant MH #8-1 Valley Way 42.29 3.0% 30" RCP 61.74 12.58 0.00 * Phase 1 Roof leaders capacity for 3-10" PVC pipes ** Phase 2/3 Roof leaders capacity for 4-10" PVC pipes

® PETRY°@ EncineEcRING, LLC Time of Concentration Calculations Pre-Development Post-Development Qo Project #: 20-0265 Project: Daughters of Israel County: Essex Drainage Area: DA-1 TOC Line 1 Sheet Flow Segment 1 Segment 2 Segment 3 oe Woods, Light Woods, Light Surface Description (Table 3-1) Grass, Dense Grasses Sena Hee Manning's Roughness Coeff., n (Table 3- 0.24 0.4 0.4 Flow Length, L (total < 100 ft) 23 51 26 Two-Year 24-Hour Rainfall, P, 3.44 3.44 3.44 Land Slope, s (ft/ft) 0.04 0.08 0.46 T 3.22 6.94 2.01 Shallow Concentrated Flow — — Segment 1 Segment 2 Segment 3 Surface Description Unpaved Unpaved. paved Flow Length, L 345 185 157 Watercourse Slope, s 0.31 0.06 0.04 Average Velocity 8.9 3.9 41 T, 0.65 0.79 0.64 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, 12.17 2.08 0.00 14.25

% 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

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

@, oo PET RY° @ ENGINEERING, LLC Time of Concentration Calculations Project #: 20-0265 Project: Daughters of Israel County: Essex Pre-Development Post-Development Oo Drainage Area: DA-3 Sheet Flow — Segment 1 ~ Segment 2 Segment 3 — ws Woods, Light Surface Description (Table 3-1) Ghise DenselGraeses Un ae Manning's Roughness Coeff., n (Table 3- 0.24 0.4 - Flow Length, L (total < 100 ft) 45 55 Two-Year 24-Hour Rainfall, P, 3.44 3.44 3.44 Land Slope, s (ft/ft) 0.11 0.16 T, 3.67 5.59 - 9.26 Shallow Concentrated Flow a _ Segment 1 Segment 2 Segment 3 Surface Description Unpaved Unpaved paved Flow Length, L 140 115 64 Watercourse Slope, s 0.04 0.52 0.03 Average Velocity 3.2 11.5 35 T, 0.73 0.17 0.30 1.20 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 10.47

Project #: 20-0265 ove PET RY @ ENGINEERING, LLCO Time of Concentration Calculations Pre-Development Project: Daughters of Israel Post-Development Oo County: Essex Drainage Area: DA-4 TOC Line 2 __ Sheet Flow Segment 1 Segment 2 Segment 3 wo Woods, Light Surface Description (Table 3-1) Un ee 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) 0.15 T, 9.25 - - Shallow Concentrated Flow Segment 1 Segment 2 Segment 3 Surface Description Unpaved Flow Length, L 138 Watercourse Slope, s 0.18 Average Velocity 6.8 - - Ty, 0.34 - - 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, 9.25 0.34 0.00 9.59

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

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

Time of Concentration Calculations Project #: 20-0265 Pre-Development Project: Daughters of Israel Post-Development County: Essex Drainage Area: DA-2 Sheet Flow Segment 1 Segment 2 Segment 3 Woods, Light Surface Description (Table 3-1) Underbrush Manning's Roughness Coeff., n (Table 3-1) 0.4 - - Flow Length, L (total ≤ 100 ft) 100 Two-Year 24-Hour Rainfall, P2 3.44 3.44 3.44 Land Slope, s (ft/ft) 0.13 Tt 9.80 - - 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 7.5 - Tt 0.21 0.14 - 0.35 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 10.14