Case Studies in Collection System Management

Inverted Siphons: Reduce Maintenance Effort by Using Gravel Traps

Friday, April 20
10:25 AM - 10:50 AM
Location: Meeting Room 313, Sacramento Convention Center

CWEA: .5 Contact Hours

Practice Area: Professional Challenge Area: Collection Systems

Inverted siphons are typically the hardest part of a collection system to clean and often require more than their “fair share” of the maintenance budget. In this session hear about a gravel trap that was installed upstream of an “impossible-to-clean” siphon and how the maintenance effort has been reduced.

Learner Outcomes:

Level: Intermediate; working knowledge of subject matter / journeyman level staff

Glenn Hermanson

Senior Technical Practice Leader
Woodard & Curran


Glenn Hermanson is a Senior Technical Practice Leader with the consulting firm Woodard & Curran in Sacramento. He is a civil engineer with degrees from Cal Poly and Virginia Tech. He has been involved in pipeline projects from Alaska to Florida to Hong Kong. He is a registered civil engineer with more than 25 years of experience focused on sewers and pipelines.


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William Halsted

District Engineer
Oro Loma Sanitary District


Bill Halsted is the District Engineer with the Oro Loma Sanitary District which located south of Oakland and serves San Lorenzo, Ashland, Cherryland, Fairview, and portions of Castro Valley, the City of San Leandro, and the City of Hayward. He is a registered civil engineer with degrees from Humboldt, Dominguez Hills, and Norwich. He has 22 years of experience.


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Gary Warren

Senior Civil Engineer / Supervisor of Wastewater Design Section


Gary Warren, PE, is a Senior Civil Engineer for the East Bay Municipal Utility District (EBMUD), supervising the Wastewater Engineering Division’s Design Section. This Section performs in-house design work for the Wastewater Department’s capital improvement projects. Projects include treatment plant, collection system and recycled water system upgrades and rehabilitation. Gary has been very involved with EBMUD’s innovative resource recovery and co-digestion program, which allows their treatment plant to produce typically 130% of the power needed to operate the plant. Gary has a BS in chemical engineering from UC Santa Barbara and 30 years of experience. Prior to working for the District, he also worked for CH2M HILL (now part of Jacobs) and Metcalf & Eddy (now part of AECOM). He is also very active in CWEA, currently serving on the board of the local SF Bay Section.


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Inverted Siphons: Reduce Maintenance Effort by Using Gravel Traps


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