Flood control reservoir operations for conditions of limited storage capacity

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Title: Flood control reservoir operations for conditions of limited storage capacity
Author: Rivera Ramirez, Hector David
Abstract: The main objective of this research is to devise a risk -based methodology for developing emergency operation schedules (EOS ) . EOS are decision tools that provide guidance to reservoir operators in charge of making real -time release decisions during major flood events . A computer program named REOS was created to perform the computations to develop risk -based EOS . The computational algorithm in REOS is divided in three major components : (1 ) synthetic streamflow generation , (2 ) mass balance computations , and (3 ) frequency analysis . The methodology computes the required releases to limit storage to the capacity available based on the probabilistic properties of future flows , conditional to current streamflow conditions . The final product is a series of alternative risk -based EOS in which releases , specified as a function of reservoir storage level , current and past inflows , and time of year , are associated with a certain risk of failing to attain the emergency operations objectives . The assumption is that once emergency operations are triggered by a flood event , the risk associated with a particular EOS reflects the probability of exceeding a pre -established critical storage level given that the same EOS is followed throughout the event . This provides reservoir operators with a mechanism for evaluating the tradeoffs and potential consequences of release decisions . The methodology was applied and tested using the Addicks and Barker Reservoir system in Houston , TX as a case study . Upstream flooding is also a major concern for these reservoirs . Modifications to the current emergency policies that would allow emergency releases based on the probability of upstream flooding are evaluated . Riskbased EOS were tested through a series of flood control simulations . The simulations were performed using the HEC -ResSim reservoir simulation model . Rainfall data recorded from Tropical Storm Allison was transposed over the Addicks and Barker watersheds to compute hypothetical hydrographs using HEC -HMS . Repeated runs of the HEC -ResSim model were made using different flooding and residual storage scenarios to compare regulation of the floods under alternative operating policies . An alternative application of the risk -based EOS in which their associated risk was used to help quantify the actual probability of upstream flooding in Addicks and Barker was also presented .
URI: http : / /hdl .handle .net /1969 .1 /1464
Date: 2005-02-17

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Flood control reservoir operations for conditions of limited storage capacity. Available electronically from http : / /hdl .handle .net /1969 .1 /1464 .

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