2025 12 19 Stormwater Report Rev 1

Chapter 2 Estimating Runoff and Peak Part 650 Discharges Engineering Field Handbook NJ Supplement NEW JERSEY 24 HOUR RAINFALL FREQUENCY DATA Rainfall amounts in Inches County Tyear 2year Syear {Oyear 25 year SOyear 100year Atlantic 2.72 3.31 4.30 5.16 6.46 7.61 8.90 Bergen 2.75 3.34 427 5.07 6.28 7.32 8.47 Burlington 2.77 3.36 4.34 5.18 6.45 7.58 8.81 Camden 2.73 3.31 4.25 5.06 6.28 7.34 8.52 Cape May 2.67 3.25 4.22 5.07 6.34 7.47 8.73 Cumberland 2.69 3.27 425 5.09 6.37 7.49 8.78 Essex 2.85 3.44 4.40 5.22 6.44 7.49 8.66 Gloucester 274 3.29 4.24 5.05 6.29 7.36 8.55 Hudson 2.73 3.31 4.23 5.02 6.19 7.20 8.31 Hunterdon 2.80 3.38 4.26 5.00 6.09 7.02 8.03 Mercer 2.74 3.34 4.23 5.01 6.19 7.20 8.33 Middlesex 2.76 3.35 4.30 5.12 6.36 7.43 8.63 Monmouth 2.79 3.38 4.38 5.23 6.53 7.66 8.94 Mortis 2.94 3.54 4.47 5.24 6.37 7.32 8.35 Ocean 2.81 3.42 4.45 5.33 6.68 7.87 9,20 Passaic 2.87 3.47 4.42 5.23 6.43 747 8.62 Salem 2.69 3.26 4.20 §.00 6.22 7.28 8.45 Somerset 2.76 3.34 4.25 5.01 6.15 7.43 8.21 Sussex 2.68 3.22 4.02 4.70 5.72 6.60 7.58 Union 2.80 3.39 4.35 5.17 6.42 7.49 8.69 Warren 2.78 3.34 4.18 4.89 5.93 6.83 7.82 Notes: The average point rainfall amounts listed above were developed from data contained in NOAA Atlas [4 Volume 2. Point rainfall estimates for specific locations may be obtained from the Precipitation Frequency Data Server located at http://www.nws.noaa.zov/ohd/hdse/ For most hydrologic design procedures, the rainfall amounts listed above may be rounded to the nearest tenth of an inch. Page | of 2 August, 2012