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Pipeline. Due to maximum pressure limitations on both the upstream and downstream sides of the <br />system, surge protection measures in the form of pressurized surge tanks have been recommended and <br />installed at the pump station. Additionally, the Bernasconi Tunnel was fitted with three 10-inch vacuum <br />relief valves to utilize the tunnel as a surge tank to prevent maximum pressures in the suction system from <br />exceeding allowable values. Testing performed by MWD verified the results of the modeling. <br />Bay Delta Conservation Plan, Northern California <br />Metropolitan Water District of Southern California <br />Scott performed hydraulic analyses to determine the feasibility of operating the proposed system under <br />two potential pump operation alternatives: the Modified Pipeline Tunnel Option (MPTO) and Clifton <br />Court Option (CCO). Under the MPTO, three 3000 cfs pump stations located at the upstream end of the <br />system would take flow directly from the Sacramento River and deliver it through two tunnels to the <br />Intermediate Forebay (IF) where it would then flow by gravity through two 40 ft diameter tunnels to the <br />Clifton Court Forebay. For the CCO, the flow would come from three locations on the Sacramento River <br />and flow by gravity through two tunnels to a junction structure where two 40 ft diameter tunnels would <br />deliver the flow to two 4500 cfs pump stations located adjacent to the CCF. The analyses highlighted <br />advantages and disadvantages of each, allowing MWD to use the information to assist them in <br />determining their preferred alternative. <br />Carlsbad Desalination Project Product Water PS and Conveyance Pipeline, San Diego County, CA <br />Tetra Tech/San Diego County Water Authority <br />The Product Water Pump Station consists of eight pumps that delivers up to 57 mgd of desalinated <br />water through the approximately 53,000 ft long, 54-inch Conveyance Pipeline to the San Diego County <br />Water Authority's Second Aqueduct. Scott performed hydraulic and pressure surge analyses for the <br />system under multiple head, friction, and flow conditions. The maximum and minimum allowable <br />pressures in pre -constructed segments of the pipeline required surge protection prepared by others to <br />be reevaluated. Scott determined that surge protection in the form of three 26,000 gallon pressurized <br />surge tanks were required to protect the system. Field testing showed the predicted results to be within <br />three percent or less of the field test results. <br />Additional Projects <br />Additional systems he as analyzed for MWD and surrounding agencies include the Rialto and Etiwanda <br />Pipelines/Etiwanda Power Plant, Greg Avenue Pressure Control Structure (PCS) and Power Plant, West <br />Valley Feeder No. 2, Calabasas Feeder, La Verne Pipeline, Yorba Linda Pipeline, East Valley Feeder, Santa <br />Monica Feeder, Box Springs Feeder, Bernasconi Tunnel, Lakeview Pipeline, Eastside Pipeline, Central <br />Feeder and Redlands/Texas Street Pump Station, Box Springs Feeder, Santa Ana Valley Pipeline, and Sar <br />Diego Pipelines 3 and 4. <br />SCOTT FOSTER ENGINEERING, INC. 3 of 3 <br />