Wastewater Tsunami: SSO/CSO Storage Facility Relief

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Forest Hunt

Presented at the Georgia Association of Water Professionals Fall Conference.

This presentation covers the challenges related to the planning and designing of a wet weather storage facility as part of a larger Consent Decree program in San Antonio. San Antonio Water System (SAWS) entered into a Consent Decree in 2013 with the United States Environmental Protection Agency (USEPA). SAWS has developed the Basin Planning project to support the Sanitary Sewer Overflow Reduction Program (SSORP) team to meet the mandates of the Consent Decree. As the Basin Planning Consultant (BPC) for the Central Basin, Freese and Nichols, Inc. (FNI), teamed with CH2M HILL (CH2M), was tasked with developing the Condition and Capacity Remedial Measures Plans for the wastewater collection system basin-wide. In developing these plans, FNI conducted an alternatives analysis for each capacity constraint identified by the SSORP team. The alternatives analysis was completed in two phases: 10% design – Feasibility analysis and 30% design – Development of selected alternatives. This paper focuses on the 30% design of the Rilling Road Storage Facility, which will be a new wet weather storage facility that will temporarily divert flows from the main interceptor sewer to the Dos Rios Water Recycling Center (WRC). The 30% design will be submitted to a design consultant that is selected by SAWS. The Rilling Road Storage Facility will be designed for potential expansion in the future to allow SAWS flexibility to divert additional flows if necessary.

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