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Map 1. Rock River Region
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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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