7-Day 10-Year Low Flow Maps - Map Information, Illinois State Water Survey

7-Day 10-Year Low Flow Maps

Map 1. Rock River Region

The low flow estimates presented here for the Rock River region represent an October 2002 update of previous published versions (Singh, 1973; Singh et al., 1988a). These new low flow values were estimated from the Illinois Streamflow Assessment Model for the Rock River watershed, the preparation and analysis of which is documented in Knapp (2002). The estimates produced by this model are based on hydrologic data collected up through 2001, which include USGS streamgage records, water-use records collected by the Illinois State Water Survey, and discharge data from wastewater treatment facilities and industries as reported to the Illinois Environmental Protection Agency. Selected water use and effluent discharge estimates have been updated so that the values represent the current (2001) hydrologic conditions in the region.

Knapp, H.V. 2002. Streamflow Assessment Model for the Rock River Watershed: Hydrologic Analysis. Illinois State Water Survey Contract Report, in preparation.

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