We designed a 36-inch force main and 48-inch gravity sewer that would terminate at the new pump station. Both pipelines are approximately 11,000 feet in length and we used tunnels to cross roadways due to the terrain and the cost to reconstruct an excavation. In order to preserve existing wetlands, the project was coordinated with the US Army Corps of Engineers and the Georgia Environmental Protection Division.
In addition to meeting the requirements of the site’s tight footprint, the new pump station’s straightforward layout was designed with maintenance in mind. Workers have easy access to the pumping system, as well as equipment, valves, piping and electrical controls. Even access roads to and from the site and the entrances and exits to the facility are intentionally placed. The layout worked so well that Gwinnett County now uses the Lower Big Haynes Creek layout as the model layout for all of their new facilities. Thanks to the pump station’s efficient design, Gwinnett County was able to decommission one of its smaller stations upstream. By reducing the number of stations in operation, the county has seen energy and maintenance cost savings.
After the initial pump station design, we were asked to design a canopy to go over the below-grade pump station wet and dry-wells. Once complete, the canopy will help reduce water infiltration into the wet-wells, reduce corrosion of the dry-wells and shelters the maintenance staff from nasty weather.