City of Fortuna Wastewater Treatment Plant Flood Protection Project

The City of Fortuna Wastewater Treatment Plant (WWTP) Flood Protection Project consists of improvements to the facility to protect the wastewater system during flood events. These improvements include an earthen berm around the eastern portion of the plant and a new treated effluent pump station designed to withstand a 100-year flood conditions. The flood protection berm will be designed to use the existing berm surrounding the eastern perimeters of the facility, and raise its height to 43.5 feet allowing for 1 foot of freeboard at the 100-year flood. The berm is expected to be approximately 1,764 feet in length and 1,585 cubic yards in volume. The project will include a pump station to allow effluent from the WWTP to flow during flood conditions when it cannot flow by gravity. Piping modifications will be made to the WWTP to withstand the maximum effluent flows. The project includes the design of a stormwater overflow drainage pipe as well as improvements to the treatment plant effluent pipe. When completed the public WWTP will continue to function properly during emergency conditions experienced during a 100-year flood