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Publication Abstract

Kane County Water Resources Investigations: Final Report on Shallow Aquifer Potentiometric Surface Mapping. Locke, Randall A., II, and Scott C. Meyer., 2007  Illinois State Water Survey, Champaign, IL,  ISWS CR 2007-06    Full Text Available

Prompted by concerns for their county's water resources, Kane County officials funded a multifaceted project to be conducted by the Illinois State Water Survey (ISWS) and Illinois State Geological Survey (ISGS). The project, initiated in May 2002 and scheduled to conclude in December 2007, will provide baseline water-resources data, analyses, and tools for future analyses of water resources available to the county.

This report presents and discusses groundwater data and analyses performed as a part of the investigations in Kane County. It supersedes the interim report on potentiometric mapping produced in April 2005. Shallow aquifers considered include the unconsolidated sand-andgravel aquifers and the uppermost bedrock (i.e., the shallow bedrock aquifer). Deeper bedrock aquifers, including the productive Ancell Group and Ironton-Galesville sandstones, are not within the scope of this study, but are discussed in other ISWS reports.

The study area includes Kane County and adjacent townships covering a total area of 1260 square miles. A network of 1010 private, public, industrial, and commercial wells was assembled during the inventory phase (May 2002 - August 2003). During the synoptic phase (September - October 2003), water-level measurements were collected from those wells. Waterlevel data were used to construct potentiometric maps for three shallow aquifers: the Ashmore Tongue, the aggregated Glasford Formation sands, and the shallow bedrock.

Using only groundwater data to constrain the potentiometric surfaces of individual aquifers, the potentiometric surfaces still closely correlated with perennial stream configurations and land-surface topography. The Fox River and Marengo Ridge are the most influential features that determine regional groundwater flow patterns in the county. Groundwater flow west of the Fox River is predominantly to the south and east. East of the Fox River, flow is to the south and west.

The final potentiometric maps can be used to characterize regional groundwater flow, identify areas of groundwater recharge and discharge, determine regional effects of groundwater withdrawals, and provide a baseline for comparison with future groundwater conditions. The maps have been useful in developing a conceptual model of groundwater flow and corresponding mathematical groundwater flow models for a wide range of analyses, including aquifer development scenarios.

In 2003, 52 high-capacity wells accounted for 6.6 billion gallons or 96 percent of the total reported groundwater withdrawals of 6.9 billion gallons from the shallow aquifers in Kane County. Groundwater withdrawals appear to have locally influenced the head surfaces, particularly in east-central and southeastern Kane County. Areas of relatively low head in the shallow bedrock aquifer may reflect large withdrawals from the aquifer, hydraulically connected units, and/or areas of significant discharge to the Fox River.

Some source aquifer assignments have been changed since the interim report was published in 2005, and this report presents the updated interpretations as well as new potentiometric maps based on those interpretations. This report supersedes the interim report. Because of the mapping scale, updates to the underlying data have not significantly affected the maps from a regional groundwater flow perspective.

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