Location

Portland, OR

Start Date

29-6-2016 1:30 PM

End Date

29-6-2016 3:30 PM

DOI

doi:10.15142/T3740628160853

Description

The Central Arizona Project (CAP) is designed to bring about 1.9 ML of Colorado River water per year to Maricopa, Pima, and Pinal counties in Arizona. CAP carries water from the Colorado River at Lake Havasu toTucson. The CAP canal system is a 540 km long system of conveyance system aqueducts, tunnels, pumping plants,pipelines and a large reservoir (just north of Phoenix, AZ). Water is pumped uphill from the Colorado River. This study was conducted for the Hayden-Rhodes Aqueduct of the Central Arizona Project (CAP), which starts at the after bay of the Bouse Hill Pumping Plant and extends to the fore bay of the Salt-Gila Pumping Plant, which is just south of the Salt River, east of Phoenix. Additional pumping plants downstream lift water uphill to Tucson. The canal between adjacent pumping plants defines a canal segment. A sloping lined canal with check structures carries water between power plants. The canal between adjacent check structures defines a canal pool. The Pumping Plants use electric motors to power the pumps. Power outages could cause the canal to overtop at the fore bay of these power plants, since the flow in the canal would not stop with a power outage. The check structures in between the power plants can be closed with battery-operated electric motors. This was intended to contain water within each canal pool, if power is lost. Stopping the pumping plants and closing the check gates causes surge waves in the canal. Some additional freeboard at the downstream end of each canal pool was provided to contain these surge waves. Increases in frictional resistance in the canal have reduced the available canal freeboard from design conditions. This study evaluated the available freeboard in the canal during steady conditions and during unsteady conditions, associated with a power outage. HEC-RAS was used to determine water surface elevations and available freeboard under both steady and unsteady conditions.

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Jun 29th, 1:30 PM Jun 29th, 3:30 PM

Unsteady-Flow Modeling for Emergency Shutdown of the CAP Canal

Portland, OR

The Central Arizona Project (CAP) is designed to bring about 1.9 ML of Colorado River water per year to Maricopa, Pima, and Pinal counties in Arizona. CAP carries water from the Colorado River at Lake Havasu toTucson. The CAP canal system is a 540 km long system of conveyance system aqueducts, tunnels, pumping plants,pipelines and a large reservoir (just north of Phoenix, AZ). Water is pumped uphill from the Colorado River. This study was conducted for the Hayden-Rhodes Aqueduct of the Central Arizona Project (CAP), which starts at the after bay of the Bouse Hill Pumping Plant and extends to the fore bay of the Salt-Gila Pumping Plant, which is just south of the Salt River, east of Phoenix. Additional pumping plants downstream lift water uphill to Tucson. The canal between adjacent pumping plants defines a canal segment. A sloping lined canal with check structures carries water between power plants. The canal between adjacent check structures defines a canal pool. The Pumping Plants use electric motors to power the pumps. Power outages could cause the canal to overtop at the fore bay of these power plants, since the flow in the canal would not stop with a power outage. The check structures in between the power plants can be closed with battery-operated electric motors. This was intended to contain water within each canal pool, if power is lost. Stopping the pumping plants and closing the check gates causes surge waves in the canal. Some additional freeboard at the downstream end of each canal pool was provided to contain these surge waves. Increases in frictional resistance in the canal have reduced the available canal freeboard from design conditions. This study evaluated the available freeboard in the canal during steady conditions and during unsteady conditions, associated with a power outage. HEC-RAS was used to determine water surface elevations and available freeboard under both steady and unsteady conditions.