URBAN STORMWATER-QUALITY INVESTIGATIONS BY THE USGS.

U. S. Geological Survey (USGS) urban stormwater investigations, in cooperation with local and Federal agencies, have produced significant national data bases of information and enhanced understanding of urban hydrologic processes. Studies in progress include statistical regionalization of urban stormwater quality, the effects of stormwater detention on water quality, ways of improving instrumentation for urban hydrology studies, and an evaluation and update of urban gaging networks. Studies performed by USGS since 1968, including 12 studies that were in the Environmental Protection Agency Nationwide Urban Runoff Program, are being summarized in a USGS report.