| Optimization of Operational Policies for Tarrant Regional Water District’s West Fork System |
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Vini de Oliveira—Tarrant Regional Water District; John Craven—Hydros Consulting, Inc.; Nick Mander—Hydros Consulting, Inc.; Nicole Rutigliano—Tarrant Regional Water District |
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ABSTRACT |
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The Tarrant Regional Water District (TRWD) West Fork System consists of three water supply lakes that were built between the 1910s and 1930s as an integrated system to supply water to the City of Fort Worth and adjacent areas. Due to updated infrastructure, climatic characteristics of the lakes and increasing demands over the years, it was necessary to optimize the West Fork operations to improve reliability of the System during extreme drought conditions. A multi-objective optimization algorithm (NSGA-II) was coupled with RiverWare to perform the optimization with the goal of determining operational parameters that result in an optimal balance between the Lake Bridgeport and Eagle Mountain Lake pool elevations and storage volumes. The optimization was based on two decision variables: a “Drawdown Ratio” based on the departure from conservation elevation for both lakes; and a minimum threshold elevation for water releases at Lake Bridgeport. Four different optimization scenarios were evaluated, and the results showed that a Drawdown Ratio of 1.75 and minimum release elevation of 800 ft-msl at Lake Bridgeport together reduce the overall impacts to TRWD Customers, thereby providing for increased water supply reliability of the System during extreme drought conditions. |
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