Over the years, the City of Anderson continued to experience increases in wastewater flow whenever significant rainfall events occurred. These flow increases were due to stormwater entering the wastewater collection system. This phenomenon is known as rain-dependent inflow and infiltration. Design South developed a comprehensive Inflow and Infiltration (I/I) removal plan for basin specific areas with excessive I/I, including extensive flow monitoring, smoke testing, manhole inspections, and development of cost effective rehabilitation solutions using a variety of traditional and trenchless methods.
The restoration portion of the project included cleaning and internal inspection of 37,000 linear feet of sewer, rehabilitation of 29,900 linear feet of sewer using cured-in-place pipe technology, restoration of 11 existing manholes using a sulfide resistant cementitious mortar, and other repairs to 20 existing manholes to mitigate excessive inflow and infiltration from the Rocky River and Generostee Creek Drainage Basins.
Trenchless methods helped eliminate significant maintenance problems for the City by structurally rehabilitating sewers without excavation, including 13 sewers under buildings, 5 sewers under railroads, 7 sewers under highways, and 6 sewers under creeks.