12 2026 02 12 Crestmont CC Stormwater Management Report

Table 2 – NOAA Atlas 14 Precipitation Summary for 24-Hour Storm Events 2-yr 10-yr 25-yr 100-yr (in) (in) (in) (in) 3.43 5.22 6.46 8.72 In accordance with N.J.A.C. 7:8-5.7.(c), the precipitation depths from NOAA Atlas 14 shall be modified for the “current” storm events using the following precipitation adjustment factors, which are based on the project site’s location within Essex County. Table 3 – Current Precipitation Adjustment Factors for Essex County 2-yr 10-yr 25-yr 100-yr 1.01 1.03 1.04 1.06 Note: The adjustment factor for the 25-year storm event was found using a weighted average of the 10-year and 100-year storm event adjustment factors. The purpose of determining the 25-year storm event adjustment factor is for inputting basin-routed discharge rates into the conveyance network design software, as the proposed conveyance networks are designed for the 25-year design storm event. Table 4 – Current Precipitation Summary for 24-Hour Storm Events 2-yr 10-yr 25-yr 100-yr (in) (in) (in) (in) 3.46 5.38 6.72 9.24 In accordance with N.J.A.C. 7:8-5.7.(d), the precipitation depths from NOAA Atlas 14 shall be modified for the “future” storm events using the following precipitation adjustment factors, which are based on the project site’s location within Essex County. Table 5 – Future Precipitation Adjustment Factors for Essex County 2-yr 10-yr 25-yr 100-yr 1.19 1.22 1.26 1.33 Note: The adjustment factor for the 25-year storm event was found using a weighted average of the 10-year and 100-year storm event adjustment

.19 1.22 1.26 1.33 Note: The adjustment factor for the 25-year storm event was found using a weighted average of the 10-year and 100-year storm event adjustment factors. The purpose of determining the 25-year storm event adjustment factor is for inputting basin-routed discharge rates into the conveyance network design software, as the proposed conveyance networks are designed for the 25-year design storm event. 6