The City of Hot Springs, facing compliance with an EPA regulatory action, initiated a citywide program to mitigate recurring sanitary sewer overflow (SSO) violations at a rate of 18 reported SSOs per 100 miles of sewer. The Hot Springs wastewater collection system is unique because of its mountainous topography. The system uses more than 3,200 grinder pumps to transport flows through the system.
The mandate of the regulatory action was to eliminate all wet-weather SSOs under the order's design storm. It was critical to understand performance issues and identify where excess flows were causing overflows. A systemwide flow monitoring program provided the foundation for hydraulic modeling to formulate a plan to address capacity issues contributing to overflows.
A combination of I/I reduction measures and capacity improvements were recommended with an estimated cost of $68,000,000.
Daniel Jackson, PE
City of Hot Springs
Hot Springs, Arkansas
2008 — 2014