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Map 5. Sangamon Region
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The low flow estimates presented here for the Sangamon region represent
an April 2002 update of previous published versions (Singh, 1973; Singh
et al., 1988b). These new low flow values were estimated from the
Illinois Streamflow Assessment Model for the Sangamon River watershed,
the preparation and analysis of which is documented in Knapp (1999).
The estimates produced by this model are based on hydrologic data
collected up through 1997, 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 (2000) hydrologic conditions in the region.
Knapp, H.V. 1999. Sangamon River Streamflow Assessment Model: 1999
Update to the Hydrologic Analysis. Illinois State Water Survey Contract
Report 650.
Map Updated 4/12/2002
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