Stormwater Management in Urban Collector Streams

摘要

Flooding and streambank degradation of urban collector streams cause considerable damage and inconvenience in the City of Charlotte. The research was designed to give city officials information to help them develop a stormwater management program to solve problems of urban collector streams. The investigators evaluated the effectiveness of specific instruments the city currently uses in stormwater management. The first evaluated was the flood-plain restriction of the city's subdivision ordinance. The restriction prohibits construction below the elevation of the 10-year flood, plus two feet. Secondly, the investigators evaluated the detention provision of the zoning ordinance. A recommendation was made that the stormwater detention provision be revised to institute a development fee which can be earned back by developers who install effective detention facilities. Thirdly, the investigators examined the city's Stormwater Impoundment Design Manual and recommended its updating in respect to hydrograph formulation and hydraulic analytical procedures. Finally, the investigators examined the city's storm drainage repair policy and prepared a set of level-of-service descriptors.