are used to manage groundwater supplies. The United Water Conservation District provides wholesale water delivery through three pipelines to various portions of the Oxnard Plain. One is the Oxnard/Hueneme system which serves the City of Oxnard, the Port Hueneme Water Agency (City of Port Hueneme, Channel Islands Beach CSD) and the Naval Base Ventura County (Point Mugu and the Construction Battalion Center). A second pipeline serves agricultural uses in the Oxnard Plain. The third system supplies water to the Pleasant Valley area located between Oxnard and Camarillo. United rates for non-agricultural uses are at least three times more than agricultural users are charged as required by the state water code. The Vern Freeman Diversion Dam, built by United Water in 1991 on the Santa Clara river, channels water to shallow basins designed to replenish the aquifer. For decades before the structure was built, earthen dams were constructed in the river to divert water to farmers and replenished the aquifer. The berms would have to be rebuilt whenever winter rains created a flow that breached the berms. Southern California Steelhead were declared endangered in 1997 and the fish ladder on the structure was deemed insufficient. The National Marine Fisheries Service determined that fixing this was a high priority since it is the first structure the steelhead encounter when attempting to migrate from the ocean. United released water from Lake Piru to specifically recharge the Fox Canyon in the Oxnard Plain for the first time in 2019. Ormond Beach Ormond Beach is a broad, flat, coastal area on the south side of the Oxnard Plain that historically contained marshes, salt flats, sloughs, and lagoons. The expansion of agriculture and industry have drained, filled and degraded much of the wetlands over the past century but the area does have a dune-transition zone–marsh system along much of that extends from Port Hueneme to the northwestern boundary of Point Mugu Naval Air Station. Hazards The coastline is subject to inundation by a tsunami up to 23 feet in height. See also Ballona Wetlands California coastal prairie Coastal Strand Environment of California: Human impact on the environment Los Angeles Basin References Further reading Dunes of California Landforms of Ventura County, California Plains of the United States Regions of California Santa Clara River (California) Landforms of California Beaches of Ventura County, California