CHAPTER 5 Computing Stormwater Runoff Rates and …

New Jersey StormwaterBest Management Practices ManualFebruary 2004 CHAPTER 5 Computing StormwaterRunoff Rates and VolumesThis CHAPTER discusses the fundamentals of Computing Stormwater Runoff Rates and volumes from rainfallthrough the use of various mathematical methods. To do so effectively, the CHAPTER also describes thefundamentals of the rainfall- Runoff process that these methods attempt to simulate. Guidance is alsoprovided in the use of the Natural Resources Conservation Service, Rational, and Modified Rational Methodsthat are specifically recommended and/or required by the NJDEP Stormwater Management Rules at :8. This guidance includes use of the methods to comply with the Rules groundwater recharge, stormwaterquality, and Stormwater quantity actual physical processes that convert rainfall to Runoff are both complex and highly variable.

New Jersey Stormwater Best Management Practices Manual • Chapter 5: Computing Stormwater Runoff Rates and Volumes • February 2004 • Page 5-5 Modified Rational Method The Modified Rational Method is a somewhat recent adaptation of the Rational Method that can be used to

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