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Publication Abstract

Regional Assessment of the Ground-water Resources in Eastern Kankakee and Northern Iroquois Counties Cravens, Stuart J., Steven D. Wilson, and R. Chris Barry, 1990  Illinois State Water Survey, Champaign, IL,  ISWS RI-111    Full Text Available

A regional ground-water quantity assessment was conducted in 1987 and 1988 on the groundwater resources of eastern Kankakee and northern Iroquois Counties. Ground water has been used for irrigation for more than 50 years in this region, and development is increasing. Ground-water withdrawals by irrigation wells during the drought of 1988 increased by 167 percent over withdrawals in 1987. Irrigation wells in the study area obtain their ground water from the Silurian Dolomite aquifer, the principal bedrock aquifer underlying the unconsolidated deposits of the region. The Silurian Dolomite aquifer is recharged primarily by vertical leakage of ground water from overlying unconsolidated deposits and by influent stretches of the Kankakee and Iroquois Rivers. Response of the Silurian Dolomite during several aquifer tests was isotropic. Transmissivities from pumping and aquifer tests ranged from 14,000 to 122,000 gallons per day per square foot. Coefficient of storage of the aquiferranged from 4 x 10-5 to 6 x 10-4. Model simulations were used for initial ground-water modeling of the dolomite aquifer and to evaluate the effects of hypothetical pumping wells located in hydrologically different locations. Ground-water management options are discussed, along with current legislative mandates governing the region's ground-water resources.

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