2918-25 STORMWATER final 4_1_25.doc.pdf

28 Cumberland 1.03 1.03 1.01 Essex 1.01 1.03 1.06 Gloucester 1.05 1.06 1.06 Hudson 1.03 1.05 1.09 Hunterdon 1.02 1.05 1.13 Mercer 1.01 1.02 1.04 Middlesex 1.00 1.01 1.03 Monmouth 1.00 1.01 1.02 Morris 1.01 1.03 1.06 Ocean 1.00 1.01 1.03 Passaic 1.00 1.02 1.05 Salem 1.02 1.03 1.03 Somerset 1.00 1.03 1.09 Sussex 1.03 1.04 1.07 Union 1.01 1.03 1.06 Warren 1.02 1.07 1.15 D. Table 6: Future Precipitation Change Factors provided below sets forth the change factors to be used in determining the projected two-, 10-, and 100- year storm events for use in this chapter, which are organized alphabetically by county. The precipitation depth of the projected two-, 10-, and 100-year storm events of a site shall be determined by multiplying the precipitation depth of the two-, 10-, and 100-year storm events determined from the National Weather Service’s Atlas 14 Point Precipitation Frequency Estimates pursuant to (c)1 above, by the change factor in the table below, in accordance with the county or counties where the drainage area(s) of the site is located. Where the major development and/or its drainage area lies in more than one county, the precipitation values shall be adjusted according to the percentage of the drainage area in each county. Alternately, separate rainfall totals can be developed for each county using the values in the table below. NOTE: The municipality may instead wish to abbreviate this table along with the text in Item D above to reflect only the relevant information, depending on the location of the municipality. The future precipitation change factors added to the ordinance shall be those found in N.J.A.C. 7:8-5.7(d) as Table 5-6. Table 6: Future Precipitation Change Factors County Future Precipitation Change Factors 2-year Design Storm 10-year Design Storm 100-year Design Storm Atlantic 1.22 1.24 1.39