Illinois Water Supply Planning



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How is Water Used in Illinois? (More Information)
 
For more information on how water is used in Illinois, see the following sources of information:
 
Publications:
  Bulletin 40 index
  Reports of Investigation 11, 30, & 118
  Circular 115, 152, & 164
  Contract Report 209, 442, & 477
  Data/Case Study 2002-02 full text available online
   
All publications available on loan from the Illinois State Water Survey Library. Some publications are available online as full-text documents, in pdf form. These publications are followed by the full-text-available symbol: full text available online. Some publications have abstracts online, and are followed by the abstract-available symbol: full text available online.

Other Information:
Water withdrawals by category 1950 - 1998 (excluding power generation) This graph shows the water withdrawals by category, 1950 to 1998 (excluding power generation). Sources include mining, self-supplied industry, rural (domestic, livestock, irrigation), public water supply.
 

 
Fresh water withdrawals 1995 (MGD) This table show fresh water withdrawals during 1995, in millions of gallons per day. Topping the list is thermoelectric, followed by domestic and public supply, self-supplied industries, and livestock and irrigation.
 

 
Illinois contemporary water withdrawals by source (excluding power generation) This graph displays Illinois contemporary water withdrawals by source (excluding power generation). Sources of withdrawal include ground water, surface water, and Lake Michigan. The bulk of Illinois water withdrawal comes from Lake Michigan.
 

 

 
Water withdrawals by use by category (1998 provisional data) Here we have a pie chart displaying water withdrawals by use excluding power generation. Categories include public water supply, self-supplied industry, self-supplied commercial, self-supplied mining, self-supplied irrigation and agriculture, and self-supplied domestic water. The largest category is public water supply.
 

 

 
Communities using Lake Michigan water Communities that use Lake Michigan water are displayed on this map. The graphic displays major rivers, county boundaries, municipal boundaries, along with areas that use Lake Michigan water. Source: Martin Jaffe, University of Illinois at Chicago.
 

 
Water use against population by region Population is graphed against water use in this series of six graphics. Each one of the six is a different area of Illinois, showing the population and water use every decade from 1960 until the present. Water use has also been projected out to the year 2020 on these graphics.
 

 
Northeastern Illinois population This graphic displays the municipal and residential water use for Northeastern Illinois against the region's population (in millions of persons). The usage is divided by county, and the area's use has been projected out for the years 2010 and 2020.
 

 
Northeastern Illinois deep bedrock withdrawals 1900 - 2000 Many communities and industries in northeastern Illinois draw water from deep bedrock aquifers, and this graph displays deep aquifer withdrawals from 1900 until 2000. Upper and lower estimates of the sustained yield of this aquifer system have been estimated to be from 46 to 65 mgd, but historical withdrawals have greatly exceeded either of those estimates and water levels fell drastically as a result. In the late 1970's Lake Michigan water became available to outlying communities and pumpage from the deep aquifers was greatly reduced. However, recent trends suggest deep aquifer withdrawals are climbing again. (See this for more information: ISWS DCS 2002-02)
 

 
Lake Michigan allocations in 2000 This graph shows Lake Michigan allocations in the year 2000. The graphic shows where the water drawn from the lake was used, along with the amount for each area. Source: Martin Jaffe, University of Illinois at Chicago.
 

 
Water use: Central Illinois cities (Martin Jaffe) Central Illinois cities use both groundwater and surface water for water supply. The groundwater communities on this graph depend on a plentiful supply of water from the Mahomet aquifer. Recently, concerns have been expressed over the potential for those communities using surface water to shift to the Mahomet aquifer for their water and the impact that might have on future groundwater availability from that important resource. For more information, see: www.mahometaquiferconsortium.org.
 

 
Groundwater supplies This table displays quantitative information about groundwater supplies versus population. The number of water supplies is show for different ranges of population, from less than 100 to greater than 10,000.
 

 
Groundwater resources This graphic shows the major groundwater resources of Illinois. Note the abundance of aquifers in northern Illinois and the lack of major groundwater resources in southern Illinois. The geology of Illinois dictates that southern Illinois must rely upon the development of surface water sources: reservoirs, lakes and rivers.


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