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

7-Day 10-Year Low Flow Maps

Map 2. NE Illinois Streams


The low flow estimates presented here for the Northeastern Illinois region represent a February 2003 update of previous published versions (Singh, 1973; Singh, 1983; Singh and Ramamurthy, 1993). For the Fox River watershed, low flow values were estimated from the Illinois Streamflow Assessment Model (ILSAM), the preparation and analysis of which is documented in Knapp (1988) and Knapp and Myers (1999). Flow estimates for this map reflect hydrologic conditions based on hydrologic data collected up through 2001, which include analysis of 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.

Knapp, H.V. 1988. Fox River Basin Streamflow Assessment Model: Hydrologic Analysis. Illinois State Water Survey Contract Report 454.

Knapp, H.V., and M.W. Myers. 1999. Fox River Basin Streamflow Assessment Model: 1999 Update to the Hydrologic Analysis. Illinois State Water Survey Contract Report 649.

Map Updated 4/30/2003

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