The term "Nutrient Discharges" refers to a wide range of non-stormwater flows polluting urban waters during dry weather due to spills, leaks, and overflows from storm sewers and sanitary sewers. Dry weather nutrient discharges collectively account for as much as 20 to 40% of the annual nutrient load in urban watersheds.  Illicit discharge prevention is the practice of locating, eliminating and preventing non-stormwater entries into storm drain systems.  The Chesapeake Stormwater Network provides a variety of resources on illicit discharge prevention. Resources include two fact sheets, a webcast, and an expert panel report that outlines a series of recommendations to define removal rates for the elimination of discovered nutrient discharges from grey infrastructure.