The Chicago Illinois Stormwater Control Ordinance is a set of regulations and guidelines established by the city of Chicago to manage and control stormwater runoff within its boundaries. This ordinance plays a crucial role in protecting the city's water resources, preventing flooding, improving water quality, and promoting sustainable development practices. The primary objective of the Chicago Illinois Stormwater Control Ordinance is to minimize the adverse impacts of stormwater runoff by implementing various stormwater management practices. These practices aim to reduce the volume and velocity of stormwater runoff, increase infiltration, and promote the natural recharge of groundwater. One of the key components of the ordinance is the requirement for on-site stormwater detention and retention. This involves the installation of stormwater control measures such as detention basins, green roofs, permeable pavements, and rain gardens. These measures help to capture and store excess stormwater, allowing for gradual release and filtration before it enters the city's sewer system. Furthermore, the Chicago Illinois Stormwater Control Ordinance also emphasizes the need for erosion and sediment control during construction activities. Contractors and developers are required to implement erosion control measures to prevent soil erosion and the transportation of sediment into nearby water bodies. Additionally, the ordinance promotes the best management practices (BMPs) for managing stormwater runoff in both residential and commercial areas. It provides guidelines on techniques such as rainwater harvesting, rain barrels, and vegetative sales, which help to capture and reuse stormwater for irrigation purposes or allow for natural infiltration. It is worth mentioning that Chicago has implemented revisions to its stormwater control ordinance over the years. The most recent update, known as the Green Stormwater Infrastructure (GSI) ordinance, places a greater emphasis on using nature-based solutions, such as bio-retention areas and green roofs, to reduce stormwater runoff. In summary, the Chicago Illinois Stormwater Control Ordinance is a comprehensive set of regulations that aim to reduce stormwater runoff, prevent flooding, and protect water quality. It promotes the use of various stormwater management practices, including detention and retention, erosion control, and the implementation of the best management practices. The GSI ordinance represents the city's commitment to embracing nature-based solutions for managing stormwater.
Chicago Illinois Stormwater Control Ordinance
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For the Chicagoland region, wastewater combines with the Illinois River which flows into the Mississippi River and eventually out to the Gulf of Mexico.
Intercepting sewers: 550 miles in Cook County. About 10-15 in diameter, but up to 27 feet in diameter and about 15 feet down, these generally follow each bank of the rivers and lakes.
Building sewers that connect to private sewage disposal systems shall be a minimum of 36 inches (914 mm) below finished grade at the point of septic tank connection. Building sewers shall be a minimum of 36 inches (914 mm) below grade.
In this programme, infrastructural assets like drains, canals and reservoirs have gone beyond their functions of flood management and water storage. As they are transformed into beautiful streams, rivers and lakes, they bring people closer to water so that they can better appreciate and cherish this precious resource.
Chicago uses a combined sewer system, meaning that stormwater and wastewater are handled by the same sewers and treatment plants. During large storms, it may be necessary to dump excess from the sewers into Lake Michigan.
Residential sewer line pipe depths range from as shallow as 18 to 30 inches in depth or 5 to 6 feet deep. However, in colder climates where freezes occur, you often see sewer line depths ranging from 4 to 8 feet deep. This ensures the pipes are below the freeze line.
Uncontrolled stormwater runoff has many cumulative impacts on humans and the environment including: Flooding - Damage to public and private property. Eroded Streambanks - Sediment clogs waterways, fills lakes, reservoirs, kills fish and aquatic animals. Widened Stream Channels - Loss of valuable property.
The combined sewer system was designed to divert excess flow to local waterways instead of flooding the treatment plants or sending a mix of sewage and stormwater back up into streets and buildings. This mixture of sewage and stormwater is discharged, untreated, through outfalls into the river and canal system.
For the Chicagoland region, wastewater combines with the Illinois River which flows into the Mississippi River and eventually out to the Gulf of Mexico. For almost all other Great Lake adjacent cities, the water flows into the lakes and then out through the St. Lawrence Seaway.