The update provides guidance for the $250 million Consent Decree which took effect in 2013, as well as additional improvements not addressed by the Decree. The purpose of the program is to eliminate sanitary sewer overflows (SSOs) to the year 2040, while allowing adequate capacity in the system for future growth.
The system studied in the update serves customers in 15 incorporated communities and unincorporated areas in four counties in Tennessee and Georgia. The planning area includes over 474 square miles with a 2010 estimated population of 400,000.
The planning area is divided into four study areas, generally defined by the urbanizing areas within the drainage basins of major local tributaries. Adding to the challenge are the size and complexity of the planning area and the need to develop infiltration/inflow estimates for numerous existing contributory wastewater collection systems.
The final plan update will identify needed system improvements over the next 25 years. Each identified improvement will be selected after an evaluation of available system alternatives.
The plan update also identifies numerous mini-basin service areas with unacceptable levels of infiltration/inflow. These areas will be targeted in the City’s CMOM program.
- 2010 Planning Area Population = 400,000
- Length of Pipe in Chattanooga System = 1,350 miles
- Peak Flow at Moccasin Bend WWTP (Outlet of Collection System) = 240 MGD
- Number of Pump Stations = Over 70
- Number of CSO Facilities = 8
- Number of Mini-Basins in City of Chattanooga = 105
- Number of Regional Service Areas = 42