Water Control Strategies,
CORPS OF ENGINEERS DALLAS TX SOUTHWESTERN DIV
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The water control strategy depends first upon the latitude given the Corps of Engineers to make changes in the projects water control plan. The public laws and project documents relating to specific projects usually contain provisions for development of water control plans and appropriate revisions under the authority of the Chief of Engineers. In those cases where water quality was not mentioned in the project documents, a change in water control criteria for a water quality must be found to not have a significant detrimental impact on the authorized project purposes. The process leading to this finding has become more complex and formal during the past few years. In the past the Corps of Engineers had a much larger degree of flexibility to unilaterally change a rule curve, or change a flood control evacuation target or the criteria for hydropower scheduling. These and other adjustments were used to resolve instream flow or water quality problems. The strategy for developing water control plans for a new project is well defined in Corps guidance and regulations. One very important issue in design is to make the dividing line between the conservation and flood storage zones as wide and grey as possible. It is very important to avoid the perception of a normal pool elevation in order to retain flexibility into the future.