Emergency Repair of an Ocean Outfallby Gail Lynch,
Abstract: The County Sanitation Districts of Orange County (Districts) provide wastewater collection, treatment and disposal services for more than 2 million people in metropolitan Orange County. The Districts operate two plants that treat nearly 235 mgd of wastewater (50% advanced primary and 50% secondary) that is discharged 5 miles off Huntington Beach, California in 200 feet of water. The flapgate on the diffuser section of the Districts' 12-inch diameter ocean outfall pipe became disconnected as a result of a severe storm on January 4, 1995. During the storm, a nut was stripped off a hold-down bolt that prevents the flapgate from opening. The flapgate is a 7-foot concrete structure that was designed to remain closed except for cleaning and inspection. After the flapgate opened, it was critical to close it as soon as possible to prevent damage to the outfall and to prevent continued discharge through the end of the outfall.
Subject Headings: Ocean engineering | Emergency management | Wastewater treatment plants | Water discharge | Storms | Wastewater treatment | Beaches | Diffusion (porous media) | Urban areas | Water treatment plants | North America | California | United States
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