The City of Hot Springs’ innovative and comprehensive approach to state-mandated wastewater infrastructure improvements is the subject of the lead article in the current issue of the Water Environment Federation’s nationwide e-newsletter.
Although parts of the existing wastewater system are as old as the city itself, city staff is working with an engineering consultant to complete an advanced dynamic hydraulic model of Hot Springs’ wastewater collection system. What makes the model impressive for a city of Hot Springs’ size is not just the 2.2 million linear feet of gravity wastewater line and 1.1 million linear feet of pressure wastewater line, but also the inclusion of 293 pump stations and the 5,352 individual and duplex grinder pump stations.
Hot Springs’ unique topography and soil conditions require a large number of mechanical lift stations that are essential to the system’s overall hydraulic performance. The 24,057 sub-catchments, or individual wastewater sheds, that are included in the model provide a level of detail that will allow the city to analyze system performance in detail, from an inclusive standpoint down to a household level.
The model is the final component in a system-wide flow monitoring and comprehensive wastewater evaluation project initiated by the city, with the goal of mitigating infiltration and inflow (I &I) and improving the city’s wastewater infrastructure. The model will help target priority areas for improvement, as well as simulate current system performance.
The information obtained through the hydraulic model is crucial in the development of projects required to address the Consent Administrative Order, which the city received in August 2008 as a result of chronic wastewater overflows.
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