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A diagram of a traditional French drain. A French drain [1] (also known by other names including trench drain, blind drain, [1] rubble drain, [1] and rock drain [1]) is a trench filled with gravel or rock, or both, with or without a perforated pipe that redirects surface water and groundwater away from an area.
The District's territory covers approximately 91% of land area and 98% of the valuation of Cook County, Illinois; and, unlike other sanitary districts, the district has the power to operate facilities outside its boundaries. [7] It serves an area of 883 square miles (2,290 km 2) which covers the City of Chicago and 128 suburban municipalities.
Infiltration will occur where local groundwater elevation is higher than the sewer pipe. Gravel bedding materials in sewer pipe trenches act as a French drain. Groundwater flows parallel to the sewer until it reaches the area of damaged pipe. In areas of low groundwater, sewage may exfiltrate into groundwater from a leaking sewer. [6]
Groundwater is contaminated with various pesticides, explosives, solvents, and petroleum-related contaminants. Sediments and surface water are contaminated with various explosives, PAHs, and metals. Multiple areas throughout the facility contain munitions and explosives of concern/unexploded ordnance (MEC/UXO). [2] 10/15/1984: 03/13/1989: N/A ...
[1] [2] A percolation trench is similar to a dry well , which is typically an excavated hole filled with gravel. [ 3 ] Another similar drainage structure is a French drain , which directs water away from a building foundation , but is usually not designed to protect water quality.
Maine Township is one of 29 townships in Cook County, Illinois, United States.The population was 140,600 at the 2020 census. [1] The township was founded in 1850. Maine Township is located in Cook County, directly north and east of O'Hare International Airport in Chicago.
Watersheds of Illinois is a list of basins or catchment areas into which the State of Illinois can be divided based on the place to which water flows.. At the simplest level, in pre-settlement times, Illinois had two watersheds: the Mississippi River and Lake Michigan, with almost the entire State draining to the Mississippi, except for a small area within a few miles of the Lake.
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