Annual Sediment Loads of Illinois Streamsby Nani G. Bhowmik, Illinois State Water Survey, Champaign, IL, USA,
Rodger Adams, Illinois State Water Survey, Champaign, IL, USA,
Abstract: Incorporation of sedimentation surveys for 24 Illinois lakes was needed to provide somewhat long-term average sediment yields of Illinois streams. For each suspended sediment station a regression equation was developed between daily sediment load and average daily water discharge. These equations and the flow duration tables for the station were used to determine an average annual sediment load for each station. The data and watershed characteristics were used to divide Illinois into 11 Sediment Yield Areas (SYA). Linear regression analyses of the average annual sediment loads with drainage area and 24 geomorphic and hydraulic parameters were performed for each SYA as well as for the whole state. Cross correlations and engineering judgment were used to select three parameters for multiple regression analysis. Two sets of equations are thus given to estimate the average annual sediment load at any point on a stream or river in Illinois.
Subject Headings: Sediment loads | Rivers and streams | Load factors | Regression analysis | Streamflow | Water discharge | Suspended sediment | North America | Illinois | United States
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