Design Alternatives for Protection of the Santa Ana River Interceptor Sewer

by Thomas Dawes, (M.ASCE),
Chenchayya T. Bathala, (F.ASCE),
Carl Nelson, (F.ASCE),

Document Type: Proceeding Paper

Part of: North American Water and Environment Congress & Destructive Water


The Santa Ana River Interceptor Sewer (SARIS) line buried within the floodplain of the Santa Aria River is being threatened by long term degradation of the river bed at the pipeline crossings, and by severe erosion around manholes. The County Sanitation Districts of Orange County (CSDOC), which owns and operates the SARIS line, has retained Holmes & Narver, Inc., to study and evaluate design alternatives to preserve and protect the integrity of the pipeline. The first alternative includes field inspection, hydraulic analysis, evaluation of long term aggradation and degradation patterns of the river and recommendation of appropriate protective structures (grade stabilizers), to protect the existing SARIS line in place. The second alternative consists of a new alternate alignment parallel to the existing La Palma Avenue, which is in the high ground above the maximum possible flood elevation in the Santa Aria River. The cost estimate for the first and second alternatives is approximately $4 million and $8 million respectively. Although Alternative 1 is less expensive, it would require regular maintenance of the grade stabilizers throughout their life. Alternative 2 provides an ideal solution with practically no interference with the Santa Ana River floodway, and its riparian habitat. There is a trade off between the two alternatives and a final decision is to be made by the CSDOC with due respect for the concerns of the participating agencies.

Subject Headings: Rivers and streams | Sewers | River crossing | River bank stabilization | River and stream beds | Floods | Chemical degradation

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