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Subsurface water is generally plentiful in Illinois. However, irregular gravel deposits from glaciation can lead to difficulties predicting depth of the water table. The Mahomet Aquifer is a large aquifer used as a source for public water supply by many communities in Central Illinois.
A plot of sugarcane yield versus depth of water table in Australia. The critical depth is 0.6 m. [4] [5] Most crops need a water table at a minimum depth. [6] For some important food and fiber crops a classification was made [7] because at shallower depths the crop suffers a yield decline. [8]
The subsequent drop in water depth encouraged weed growth and changed fishing conditions. [13] The Illinois Department of Natural Resources and the City of Hammond, IN initiated the Reconnaissance Report in December 1998. It was approved in September 2000.
Lake Renwick, because of its location, depth, and the fertility of its fishery, is especially adapted to serve as a breeding location for wading birds. Unlike many Illinois lakes, this body of water has a gravel bottom, not mud. According to the Illinois Audubon Society, the heron rookery located within the lake is "by far the most valuable ...
The Mahomet Aquifer consists of sand and gravel deposited by glacial meltwater flowing westward along the Mahomet Bedrock Valley during the Pre-Illinoian glacial episode. [further explanation needed] This bedrock valley forms the western part of the Teays-Mahomet Bedrock Valley System that extends into Illinois from Indiana (Larson et al., 2003).
Lake Decatur water is also used in the process of refining corn into ethanol. In 2007, about 76 percent of Lake Decatur's water was used for commercial and industrial purposes. [2] As the largest artificial lake in Illinois at the time of construction, with a 30-mile (48 km) shoreline, Lake Decatur became a focus of Mid-Illinois recreation.
Instead of being located in the relatively flat, rolling terrain characteristic of most of Illinois, the lake is located in an unglaciated zone of deep sandstone valleys and steep slopes. Devils Kitchen Lake is located in one of these valleys, and it is one of the deepest lakes in Illinois. Sections of the lake are as deep as 90 feet (27 m). [1]
Raccoon Lake, also called Raccoon Creek Reservoir, is a reservoir in Marion County, Illinois. [1] Served by Illinois Route 161, it is 2 miles (3 km) northeast of the Illinois city of Centralia. [2] The reservoir is 970 acres in size, has a shoreline length of 16.4 miles, and possesses an average water depth of 3.9 feet. [3]