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Risk-Based Capacity and Renewal Planning in Dallas

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The City of Dallas' wastewater infrastructure consists of approximately 4,000 miles of pipelines ranging in size from 6- to 120-inches, 14 collection system lift stations, two major diversion structures and two wastewater treatment plants. The City serves 1.2 million customers and 11 customer cities included in a service area of over 340 square miles.

Dallas Water Utilities (DWU) completed master planning for the City's wastewater collection system in mid-2007. The master plan, Comprehensive Wastewater Collection System Assessment (CWWCSA), (MWH, October 2007) included development of a hydraulic model of the collection system, generation of custom-designed storms for both cloudburst and synoptic historic storm pattern and integration of risk-based methodologies for prioritizing and scheduling both capacity and for rehabilitation and renewal, collectively-termed renewal, projects.

Development of the risk-based methodology for the CWWCSA project is briefly summarized for background purposes, but this paper will focus on how level of service decisions affected implementation of the risk-based methodologies. A more extensive discussion of the risk-based methodology was presented in “Integrating Risk-Based Renewal Into a Capital Improvement Program,” (Cottingame, WEFTEC©.07).
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Document Type: Research Article

Publication date: 2008-01-01

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