Water Supply Planning: Mass Measurement of Northern Illinois Aquifers
Some of the most critical data for groundwater supply planning are water levels, and one of the most productive ways of collecting these data is via mass measurements, i.e., measuring water levels in a large number of wells over a fairly short time period. The last mass measurement in northeastern Illinois was done in 2005, with approximately 375 wells in 15 Illinois counties measured. For this mass measurement, measurements will be made in the entire northern part of the state, which will include three water supply planning regions, Northeastern Illinois, the Rock River, and the Middle Illinois River. Wells in southern Wisconsin will also be measured with the assistance of the Wisconsin Geological and Natural History Survey, which helps define the trend of water level contours in extreme northern Illinois. This work is currently underway and will be completed in 2015.