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Parks' Flood Control Systems

Parks' Overhead Sewer System

What is a Parks' Overhead Sewer System?

An overhead sewer is another type of flood control system. With an overhead sewer; the house waste water from above grade (usually from first floor and above) drains to the city or village sewer main by gravity, and all waste water from below grade (usually all the basement plumbing fixtures) drain into a basin in the basement from which it is discharged into the gravity overhead sewer line by a pump.  In addition, in Chicago the basement pump basin can collect some ground water from around the house, which is then pumped into the gravity overhead sewer line as well. In the suburbs the clean ground water must be collected by a separate pit and pump and the water must discharge onto the exterior lawn or into a storm sewer.

This plumbing design changes the house's original drainage system. The original lowest drain (usually the basement floor drain) is raised to a higher level (usually first floor bathtub drain). Outside, the original house sewer line's connection to the city or village sewer main is closed off, and a sewer clean-out is installed for rodding purposes.This keeps the basement dry from municipal sewer backup.  Technically, the overhead sewer system is believed to be the most reliable flood control system out of the three types of flood control systems. However, it cannot be installed cost effectively in all houses. The overhead sewer system is custom-designed for each house it is installed in, and it can be more complex than described above. This system is an excellent system to install when the basement walls are not finished. Also because of city and village codes it is commonly installed in new houses.