flood risk. The detention basin is augmented by an underground storage pipe designed to temporarily store up to 500,000 gallons of wastewater during large storms. This storage pipe is located under the detention basin in Boeing Creek Park. The pipe is in diameter and about long. Completed in 2007 by King County Public Works, the pipe's purpose is to help keep wastewater within the sewer system and reduce overflows into Puget Sound. The pipe conveys wastewater to the Hidden Lake Pump Station. At the same time the Hidden Lake Pump Station, located on Hidden Lake, was replaced in order to increase capacity. The old pump station lacked capacity, resulting in about three overflows into Puget Sound per year. Another related wastewater projet is the Boeing Creek Trunk Sewer Replacement. A major wastewater conveyance pipe, the Boeing Creek Trunk (BCT) was under capacity and had deteriorated with age. During heavy rain storms wastewater sometimes overflowed from manholes and into Puget Sound. These projects were all part of the Hidden Lake Pump Station replacement and sewer improvement project. Construction of this overall project began in 2006. The underground storage pipe in Boeing Creek Park was finished in 2007, Boeing Creek Trunk in 2008, and the Hidden Lake Pump Station in 2009. All of these wastewater systems are located very close to Boeing Creek, although the Boeing Creek Trunk extends north out of the creek's watershed. The City of Shoreline is planning additional stormwater management projects to reduce flooding and improve Boeing Creek's hydrology. Construction of the Pan Terra Pond and Pump Improvement Project began in 2009. See also List of rivers of Washington Thornton Creek References External links Shoreline Aerial Photos, Boeing Creek, Washington State Department of Ecology Aerial photo, Puget Sound, Boeing Creek, Washington State Department of Ecology, Coastal Atlas Rivers of Washington (state) Rivers of King County, Washington Shoreline, Washington Subterranean rivers of the United States