New Jersey Administrative Code
Title 7 - ENVIRONMENTAL PROTECTION
Chapter 45 - RULES FOR THE REVIEW ZONE OF THE DELAWARE AND RARITAN CANAL STATE PARK
Subchapter 8 - STORMWATER RUNOFF AND WATER QUALITY IMPACT REVIEW
Section 7:45-8.6 - Specific stormwater runoff quantity standards
Universal Citation: NJ Admin Code 7:45-8.6
Current through Register Vol. 56, No. 24, December 18, 2024
(a) In order to control stormwater runoff quantity impacts, the design engineer shall, using the assumptions and factors for stormwater runoff, at N.J.A.C. 7:8-5.6, Calculation of stormwater runoff, complete one of the following:
1. Design
stormwater management measures so that the post-construction peak runoff rates
for the two-, 10- and 100-year storm events are 50, 75 and 80 percent,
respectively, of the pre-construction peak runoff rates.
i. The percentages apply only to the
post-construction stormwater runoff that is attributable to the portion of the
site on which the proposed development or project is to be
constructed;
2.
Demonstrate through hydrologic and hydraulic analyses that for stormwater
leaving the site, post-construction runoff hydrographs for the two-, 10- and
100-year storm events do not exceed, at any point in time, the pre-construction
runoff hydrographs for the same storm events; or
3. Demonstrate through hydrologic and
hydraulic analysis that there is no increase, as compared to the
pre-construction condition, in the peak runoff rates of stormwater leaving the
site for the two-, 10- and 100-year storm events and that the increased volume
or change in timing of stormwater runoff will not increase flood damage at or
downstream of the site. This analysis shall include the analysis of impacts of
existing land uses and projected land uses assuming full development under
existing zoning and land use ordinances in the drainage area.
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