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Lake Springfield is a 3,965-acre (16.05 km 2) [1] reservoir in the southeast of the capital city of Springfield, Illinois. It is 560 ft (170 m) above sea level. The lake was formed by building Spaulding Dam across Sugar Creek, a tributary of the Sangamon River. It is the largest municipally-owned body of water in Illinois. [1]
The Illinois Waterway system consists of 336 miles (541 km) of navigable water from the mouth of the Calumet River at Chicago to the mouth of the Illinois River at Grafton, Illinois. Based primarily on the Illinois River , it is a system of rivers, lakes, and canals that provide a shipping connection from the Great Lakes to the Gulf of Mexico ...
The Water Tower and Pumping Station were jointly added to the National Register of Historic Places on April 23, 1975. [3] In addition the Tower was named an American Water Landmark in 1969. The Water Tower was also one of the few buildings to survive the Great Chicago Fire. The district is the namesake of the nearby Water Tower Place. [4] [5]
The basic subdivisions of Illinois are the 102 counties. [2] Illinois has more units of local government than any other state—over 8,000 in all. [3] The Constitution of 1970 created, for the first time in Illinois, a type of "home rule", which allows localities to govern themselves to a certain extent. [4]
A cone of depression is a circular area surrounding a well where groundwater levels are reduced from pumping. [1] [2] In an unconfined aquifer (water table), this is an actual depression of the water levels. In confined aquifers , the cone of depression is a reduction in the pressure head surrounding the pumped well.
The U.S. Geologic Survey measured a zero cubic feet per second discharge from the well. The recommended flow rate is 4 to 7 cubic feet per second.
Groundwater pumping has been causing the land to sink at a record pace in California's San Joaquin Valley. ... The rates of decline slowed in the 1970s and '80s as newly built aqueducts brought ...
Knox would later become a county in Indiana and is unrelated to the current Knox County in Illinois, while St. Clair would become the oldest county in Illinois. 15 counties had been created by the time Illinois achieved statehood in 1818. The last county, Ford County, was created in 1859.
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