Stormwater Report 1

FIGURE 10-B: RAINFALL INTENSITY-DURATION FREQUENCY CURVE - NORTHERN REGION DURATION OF STORM IN MINUTES 10 15 20 30 40 5060 120 180 19.0 | 8.0 |! 7.0 + 6.0=> 50S [,, | ISS 5 4.0 “™~ SS < = ‘a ae SASS : P ~ RS, 5 SS RS N F3 ARS Re : v NISSN %, |o N <A a SANS e INS 3 1.0 a SZ 0.9 0.8 ® 0.7 0.6 0.5 0.4 PARED QW: coal svat 7 le poss arias ih ob 2005 ILYEAR AND 15-YEAR oe ee | | 10 15 20 30 40 5060 120 180 DURATION OF STORM IN MINUTES

Time of Concentration Calculations Project #: 24-170 Project: The Estate County: Essex Pre-Development Post-Development Drainage Area: DA-1 (Current Adjusted) Sheet Flow Segment 1 Segment 2 Segment 3 Surface Description (Table 3-1) Grass, Dense Grasses Grass, Dense Grasses Manning's Roughness Coeff., n (Table 3-1) 0.24 0.24 20 80 Flow Length, L (total ≤ 100 ft) Two-Year 24-Hour Rainfall, P2 3.47 3.47 0.025 0.05 Land Slope, s (ft/ft) 3.46 7.95 Tt 3.47 - 11.40 Segment 2 paved 340 0.05 4.6 1.25 Segment 3 paved 120 0.025 3.2 0.62 2.20 Segment 1 Segment 2 Segment 3 - - - - - - - - - Shallow Concentrated Flow Surface Description Flow Length, L Watercourse Slope, s (ft/ft) Average Velocity Tt Segment 1 Unpaved 70 0.05 3.6 0.33 Channel Flow 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 13.60

Time of Concentration Calculations Project #: 24-170 Project: The Estate County: Essex Pre-Development Post-Development Drainage Area: DA-1 Future Projected) Sheet Flow Segment 1 Segment 2 Segment 3 Surface Description (Table 3-1) Grass, Dense Grasses Grass, Dense Grasses Manning's Roughness Coeff., n (Table 3-1) 0.24 0.24 20 80 Flow Length, L (total ≤ 100 ft) Two-Year 24-Hour Rainfall, P2 4.09 4.09 0.025 0.05 Land Slope, s (ft/ft) 3.19 7.32 Tt 4.09 - 10.50 Segment 2 paved 340 0.05 4.6 1.25 Segment 3 paved 120 0.025 3.2 0.62 2.20 Segment 1 Segment 2 Segment 3 - - - - - - - - - Shallow Concentrated Flow Surface Description Flow Length, L Watercourse Slope, s (ft/ft) Average Velocity Tt Segment 1 Unpaved 70 0.05 3.6 0.33 Channel Flow 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 12.70

Time of Concentration Calculations Project #: 24-170 Project: The Estate County: Essex Pre-Development Post-Development Drainage Area: DA-1 (Current Adjusted) Sheet Flow Segment 1 Segment 2 Segment 3 Surface Description (Table 3-1) Grass, Dense Grasses Grass, Dense Grasses Manning's Roughness Coeff., n (Table 3-1) 0.24 0.24 20 80 Flow Length, L (total ≤ 100 ft) Two-Year 24-Hour Rainfall, P2 3.47 3.47 0.025 0.05 Land Slope, s (ft/ft) 3.46 7.95 Tt 3.47 - 11.40 Shallow Concentrated Flow Surface Description Flow Length, L Watercourse Slope, s (ft/ft) Average Velocity Tt Segment 1 Unpaved 70 0.05 3.6 0.33 Segment 2 paved 159 0.05 4.6 0.58 Segment 3 Segment 2 4.909 7.854 0.63 0.035 HDPE Pipe 0.01 20.38 310 0.25 Segment 3 - 0.91 Channel Flow 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 Segment 1 4.909 7.854 0.63 0.01 HDPE Pipe 0.01 10.89 24 0.04 - - 0.29 12.60

Time of Concentration Calculations Project #: 24-170 Project: The Estate County: Essex Pre-Development Post-Development Drainage Area: DA-1 (Future Projected) Sheet Flow Segment 1 Segment 2 Segment 3 Surface Description (Table 3-1) Grass, Dense Grasses Grass, Dense Grasses Manning's Roughness Coeff., n (Table 3-1) 0.24 0.24 20 80 Flow Length, L (total ≤ 100 ft) Two-Year 24-Hour Rainfall, P2 4.09 4.09 0.025 0.05 Land Slope, s (ft/ft) 3.19 7.32 Tt 4.09 - 10.50 Shallow Concentrated Flow Surface Description Flow Length, L Watercourse Slope, s (ft/ft) Average Velocity Tt Segment 1 Unpaved 70 0.05 3.6 0.33 Segment 2 paved 159 0.05 4.6 0.58 Segment 3 Segment 2 4.909 7.854 0.63 0.035 HDPE Pipe 0.01 20.38 310 0.25 Segment 3 - 0.91 Channel Flow 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 Segment 1 4.909 7.854 0.63 0.01 HDPE Pipe 0.01 10.89 24 0.04 - - 0.29 11.70

STORM SEWER COMPUTATIONS RATIONAL METHOD - (Q=CIA) 25 YR. STORM C-Runoff Coef. AxC-Incremental Tc (MIN.) I-Rainfall Int. (in./hr) Qp-Peak Runoff (cfs) Qp-Peak Runoff (cfs) (Cumulative) Pipe/Box Length (FT.) Slope (%) Pipe/Box Size (IN.) Capacity (FULL) (cfs) Velocity (Design) (fps) Pipe Travel Time(min) Type "B" #5-1 Type "B" #4-1 0.08 0.05 0.99 0.99 0.08 0.05 6.0 6.0 5.80 5.80 0.46 0.29 0.46 0.75 165 165 1.0% 1.0% 15" HDPE 15" HDPE 8.42 8.42 6.86 6.86 0.40 0.40 Type "B" #4-3 Type "B" #4-2 Type "B" #4-1 Type "B" #4-2 Type "B" #4-1 MH #1-3 0.22 0.34 0.15 0.99 0.99 0.99 0.22 0.34 0.15 6.0 6.0 6.0 5.80 5.80 5.80 1.26 1.95 0.86 1.26 3.22 4.82 165 165 165 1.0% 1.0% 1.0% 15" HDPE 15" HDPE 15" HDPE 8.42 8.42 8.42 6.86 6.86 6.86 0.40 0.40 0.40 Type "B" #3-2 Type "B" #3-1 Type "B" #3-1 Type "B" #2-2 0.03 0.03 0.99 0.99 0.03 0.03 6.0 6.0 5.80 5.80 0.17 0.17 0.17 0.34 165 165 1.0% 1.0% 15" HDPE 15" HDPE 8.42 8.42 6.86 6.86 0.40 0.40 Courtyard Type "B" #2-3 Type "B" #2-2 Type "B" #2-1 Type "B" #2-3 Type "B" #2-2 Type "B" #2-1 Type "B" #1-4 0.42 0.02 0.02 0.18 0.99 0.99 0.99 0.99 0.42 0.02 0.02 0.18 6.0 6.0 6.0 6.0 5.80 5.80 5.80 5.80 2.41 0.11 0.11 1.03 2.41 2.53 2.99 4.02 165 165 165 165 1.0% 1.0% 1.0% 1.0% 15" HDPE 15" HDPE 15" HDPE 15" HDPE 8.42 8.42 8.42 8.42 6.86 6.86 6.86 6.86 0.40 0.40 0.40 0.40 Type "B" #1-6 Walkways Type "B" #1-5 Type "B" #1-4 MH #1-3 Type "B" #1-2 Type "B" #1-5 Type "B" #1-5 Type "B" #1-4 MH #1-3 Type "B" #1-2 Type "B" #1-1 Ex. Type Double "B" Inlet 0.32 0.02 0.13 0.34 0.99 0.99 0.99 0.99 0.32 0.02 0.13 0.34 0.13 0.99 0.13 6.0 6.0 6.0 6.0 6.0 6.0 5.80 5.80 5.80 5.80 5.80 5.80 1.84 0.11 0.75 1.95 0.00 0.75 1.84 1.95 2.70 8.67 13.49 14.24 165 165 165 165 165 165 1.0% 1.0% 1.0% 1.5% 3.5% 3.5% 15" HDPE 8.42 6.86 15" HDPE 8.42 6.86 15" HDPE 8.42 6.86 15" HDPE 10.31 8.40 15" HDPE 15.75 12.84 15" HDPE 15.75 12.84 0.40 0.40 0.40 0.33 0.21 0.21 0.20 0.99 0.20 6.0 5.80 1.15 15.39 165 3.5% 15" HDPE 15.75 12.84 0.21 Type "B" #1-1 TO Type "B" #5-2 Type "B" #5-1 FROM A-Incremental PIPE SEGMENT

DIVISION OF CONSUMER AFFAIRS LICENSE NUMBER 24GA28155900 155 PASSAIC AVENUE FAIRFIELD NEW JERSEY 07004 TEL. (973) 227-7004 FAX (973) 227-7074 PETRYENGINEERING.COM ENGINEERING , LLC REV DESCRIPTION DATE CU DRAFTED BY: JAF IN IN .7 M : 12 .6 M : 13 OC OC ET TT EN R TU RR FU CHECKED BY: JMP D LOW SHAL ENTRATE C CON FLOW ENGINEERING , LLC OW T FL E SHE PREPARED FOR THE ESTATE 111 PROSPECT AVENUE LOTS 17.01 BLOCK 151, TOWNSHIP OF WEST ORANGE ESSEX COUNTY, NEW JERSEY TITLE: EXISTING CONDITIONS DRAINAGE AREA MAP PROJECT #: 24-170 SHEET: FIG.-1

DIVISION OF CONSUMER AFFAIRS LICENSE NUMBER 24GA28155900 155 PASSAIC AVENUE FAIRFIELD NEW JERSEY 07004 TEL. (973) 227-7004 FAX (973) 227-7074 PETRYENGINEERING.COM ENGINEERING , LLC REV DESCRIPTION DATE CHECKED BY: JMP IN .6 M : 12 OC TT EN MIN RR 1.7 CU C: 1 TO RE TU FU DRAFTED BY: JAF ENGINEERING , LLC D LOW SHAL ENTRATE C CON FLOW LOW ET F SHE PREPARED FOR THE ESTATE 111 PROSPECT AVENUE LOTS 17.01 BLOCK 151, TOWNSHIP OF WEST ORANGE ESSEX COUNTY, NEW JERSEY TITLE: PROPOSED CONDITIONS DRAINAGE AREA MAP PROJECT #: 24-170 SHEET: FIG.-2

DIVISION OF CONSUMER AFFAIRS LICENSE NUMBER 24GA28155900 155 PASSAIC AVENUE FAIRFIELD NEW JERSEY 07004 TEL. (973) 227-7004 FAX (973) 227-7074 PETRYENGINEERING.COM ENGINEERING , LLC REV DESCRIPTION DATE CHECKED BY: JMP DRAFTED BY: JAF ENGINEERING , LLC PREPARED FOR THE ESTATE 111 PROSPECT AVENUE LOTS 17.01 BLOCK 151, TOWNSHIP OF WEST ORANGE ESSEX COUNTY, NEW JERSEY TITLE: INLET DRAINAGE AREA MAP PROJECT #: 24-170 SHEET: FIG.-2