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The water resources of Wildcat Creek and Deer Creek basins were evaluated by (1) describing the streamflow, (2) defining the geometry and the hydraulic characteristics of aquifers and semiconfining beds, (3) investigating the hydraulic connection between aquifers and major streams, (4) describing ground-water and surface-water quality, and (5) simulating the effects of large-scale pumping on ground-water levels and strearaflow. The area of study is 505 mi2 (square miles) of flat to rolling glacial plain. The plain is modified by stream erosion, particularly along Wildcat and Deer Creeks, which are incised. Glacial deposits of the plain, predominantly silty till, range in thickness from zero at bedrock quarries along Wildcat Creek to 200 ft (feet) in buried bedrock valleys. Devonian and Silurian limestone, dolomite, and dolomitic siltstone underlie the glacial deposits. Seasonal low flows of Wildcat Creek downstream from the mouth of Mud Creek exceeded 0.3 cubic foot per second per square mile, except in and near Kokomo, Indiana. The reaches of Wildcat Creek in and near Kokomo are affected by diversion of surface water, pumping of ground water, storage in reservoirs, treated sewage, and low-head dams. Thirty-three percent of the 7.1 million gallons per day pumped from the aquifers within the basins was used by Kokomo. A majority of the commercial, industrial, and municipal wells are in and near Kokomo. More than 90 percent of the pumpage was from the bedrock. Flow in the bedrock aquifer is predominantly through open fractures, joints, bedding planes, and solution channels above the siltstone in the Silurian Mississenewa Shale. Regional transmissivities of the bedrock obtained by ground-water flow modeling, were 1,250 square feet per day in some areas and 6,250 square feet per day in other areas. Locally, however, the transmissivities may vary considerally from these values. Water levels in the bedrock generally fluctuate plus or minus 2 ft in response to seasonal or periodic changes in recharge, but the trend in water levels is toward steady state. Discontinuous sand and gravel aquifers are interspersed within semiconfining beds of till. Thickness of the sand and gravel aquifers generally ranges from 5 to 40 ft. Horizontal flow predominates in the aquifers because of the contrast in hydraulic conductivity of the sand and gravel aquifers [200 ft/d (feet per day) based on specific-capacity data and flow modeling] and of the semiconfining beds (from 5 x 10"^ to 1 x 10~2 ft/d based on flow modeling). Effective recharge averaging 2.6 inches per year is

Water resources of Wildcat Creek and Deer Creek basins, Howard and parts of adjacent counties, Indiana, 1979-82