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Achieving Infrastructure Sustainability by Using Criticality to Guide Condition Assessment of Force Mains in an Enforcement Environment

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Hampton Roads Sanitation District (HRSD) serves a population of 1.6 million people in southeastern Virginia on the Chesapeake Bay. The transmission system is predominantly pump stations and pressure force mains with a total of 500 miles of pipe. Treatment is provided at 13 plants which process 230 million gallons per day.

HRSD's performance record for sanitary sewer overflows (SSOs) is very good with only 21 SSOs occurring in 2008. However, EPA has a policy of SSO enforcement under the Clean Water Act at all large systems with average daily flows greater than 100 MGD. EPA is actively pursuing enforcement with HRSD. In addition, HRSD and 13 localities that contribute flow to the regional system have entered into a three party special order by consent (SOC) with the Virginia Department of Environmental Quality (VDEQ) to address SSOs regionally.

Part of both enforcement actions is condition assessment of the infrastructure including the force main network. The program for force main assessment was developed using risk and criticality, in part, to guide the assessment program.
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Keywords: Force main; Infrastructure sustainability; Operational optimization; SSO; condition assessment; criticality; failure; risk

Document Type: Research Article

Publication date: 2010-01-01

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