View File - Development Services - City of Oxnard

WATER RESOURCES TECHNICAL REPORTOxnard-Hueneme Delivery SystemThe O-H pipeline (1954) moves municipal groundwater extraction away from coastal areassubject to seawater intrusion. The O-H system consists of wells located at the El Riospreading grounds and along Rose Avenue, a water treatment plant, booster plant, and12 miles of distribution pipeline. The O-H pipeline is designed to deliver up to 55 cfs ofpotable water to wholesale customers on the Oxnard Plain (City of Oxnard, PHWA, NavalBase, and a number of small mutual water companies). Approximately 16,200 AFY ofpotable water were pumped at the El Rio facility and delivered to the O-H system duringthe 2000 water year.Pumping-trough PipelineThe PTP (1986) conveys diverted Santa Clara River water to agricultural pumpers on theOxnard Plain to offset pumping of wells in this area. Five LAS wells provide additionalwater to the system when surface water supplies are incapable of meeting demand. The PTPsystem was designed to serve 4,000 acres of farmland and has a capacity of approximately21,000 AFY. Approximately 7,000 AFY of surface water were delivered to the PTP systemduring the 2000 water year.Pleasant Valley PipelineThe Pleasant Valley pipeline (1958) supplies surface water from the Freeman Diversion toagricultural users in Pleasant Valley to offset pumping of wells in this area. The PleasantValley pipeline terminates at Pleasant Valley reservoir, owned by PVCWD. PVCWDoperates 11 LAS wells in the western Pleasant Valley basin, supplying water to agriculturalusers via a delivery system linking the wells and the reservoir. The pipeline is 25,600 feetlong and 54 inches in diameter, with a design capacity of 75 cfs. The 150-acre-foot reservoirfunctions as an irrigation water regulating reservoir for 12,000 acres of farmland.Approximately 10,500 AFY of surface water was delivered to the PTP system during the2000 water year.Groundwater SuballocationsUWCD currently holds a suballocation through the FCGMA on behalf of the City ofOxnard, PHWA, and OVMWD. These users pay for delivery of this water through the O-Hpipeline. Rates vary based on the amount of water delivered.Supplemental M&I ProgramUWCD is currently implementing the Supplemental M&I Water Program, which is anextension of the Conejo Creek Diversion Project. As described above, the Supplemental M&IWater Program involves delivering an estimated 4,000 AFY of water from Conejo Creek toPVCWD in lieu of groundwater pumping, which would result in the transfer of pumpingcredits to CMWD. This, in turn, would transfer the credits to UWCD for use by O-Hpipeline customers. These deliveries would be made during wet and average years asgroundwater level conditions dictate in the Forebay area. As described above, the Saticoywellfield, currently being constructed adjacent to the Saticoy Spreading Grounds, isdesigned to reduce groundwater stored in the Forebay during the dry season, thus creatingadditional storage space in the Forebay for wet-season recharge. Pumped water will beW112003002SCO LW1458.DOC/ 033390002 32