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Practical Park Irrigation
Water reuse in a southern California beach community
by Mark Baker
The No. 1 cause of coastal water pollution in southern California is urban storm water runoff. The city of Redondo Beach is taking steps to protect its coastal waters by harvesting runoff, removing pollutants and using the water to irrigate Alta Vista Park.
"With this innovative project, the city of Redondo Beach is taking a positive step to protect beach users and at the same time conserve southern California's scarce water supply," said John Kemmerer, associate Water Div. director for the U.S. Environmental Protection Agency's (EPA) Pacific Southwest Region.
Park Planning
The Alta Vista Park Diversion and Reuse Project is a $2.2-million venture designed to help the city of Redondo Beach comply with Regional Water Quality Control Board requirements to reduce storm water pollution. This system will store runoff from dry-weather and first-flush flows as well as larger rain events.
The project is funded by the American Recovery and Reinvestment Act (ARRA) and administered through the State Water Resources Control Board's Clean Water State Revolving Fund. Under the recovery act, California received $280 million from the EPA for water quality protection projects; at least 20% of these funds must be provided to green projects that support sustainable practices, such as the Alta Vista Park project.
"The City Council has been very proactive regarding water quality and green development. Their support has given the staff the incentive to think outside the box and to come up with innovative projects that protect the bay and our valuable resources," said Mike Shay, principal civil engineer for the city of Redondo Beach.
Capturing and reusing storm water, also known as rainwater harvesting, helps maintain a site's predevelopment hydrology. Redondo Beach needed a rainwater harvesting system installed below grade to accommodate the small site constraints of Alta Vista Park. The city selected a four-phase rainwater harvesting system (including both treatment and storage) from Contech Construction Products Inc.
Solutions Walk-Through
Mehta Mechanical Co. first installed a CDS system to pretreat the runoff. The indirect screening capability of the CDS allows for 100% removal of floatables and neutrally buoyant material, without blinding.
Storm water runoff then flows to a DuroMaxx rainwater storage system consisting of two 60-in.-diameter cisterns designed to contain the water for reuse in irrigation. Initially the North Buffer (surge) tank provides 20,714 gal of storage and regulates the storm water flow through the main pipelines by acting as a buffer during peak loads.
The ElectroFusion joint of the system remains watertight with a zero leak rate up to a pressure of 30 psi, which led to its selection on this project. The frequency of rain events can be sporadic in southern California, and the reduction of water loss is extremely important.
Water flow is then refined in the third phase with the storm water management StormFilter . Two 8-ft-by-16-ft StormFilter precast vault systems treat runoff to remove fine pollutants. This technology was chosen because its patented, surface-cleaning system prevents surface blinding, extending the cartridge life cycle and reducing maintenance.
Finally, the South Cistern DuroMaxx storage tank acts as the main storage—holding 123,339 gal—before irrigation reuse. The irrigation water supply system includes two vertical turbine pumps and a hydropneumatic tank to keep the water pressure and flow rates equivalent to current irrigation demands. If the South Cistern is dry, the structure will isolate itself and water will be provided by the municipal water system. A reduced-pressure double-check backflow preventer also has been installed to prevent cross-contamination.
Project Timeline
The city broke ground on the Alta Vista Park Diversion and Reuse Project on Feb. 9, 2010. Completion of the entire project is scheduled for September 2010. When the project goes online, it will be monitored through an SCADA system that allows for remote real-time observation. The impact on water quality in the Santa Monica Bay will be monitored as well.
CONTECH Construction Products Inc.
9025 Centre Pointe Dr.
Suite 400
West Chester, Ohio 45069
P: 909.797.1367
F: n/a
bakerm@contech-cpi.com
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Copyright 2010 Scranton Gillette Communications Inc.
3030 W. Salt Creek Lane, Suite 201
Arlington Heights, Illinois 60005-5025 USA
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