Innovative modeling approaches improve capacity planning at Orange County sanitation district

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The Orange County Sanitation District (OCSD or District) owns and operates the regional collection system in north and central Orange County, California. The system, which includes over 400 miles of trunk sewers, conveys approximately 250 million gallons of wastewater per day from local sewers within a 471-square-mile service area to two treatment plants.

Recently, the District updated the collection system capacity element of its Strategic Plan. The project included the development, calibration, and application of a new dynamic hydraulic model of the District’s trunk sewer system. The model utilized the District’s new sewer GIS database, and was calibrated using flow monitoring data at 150 sites obtained over a recent three-year period.

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