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<br />b. Reduction in flood control space requirements can sometimes <br />be made on the basis of seasonal variation in flood potential or, if <br />long-term forecasts are dependable (as in the case of snowmelt floods <br />in some regions), space can be adjusted in relation to the forecast. <br />c. Reservoir space provided for flood control should be held <br />empty during times when full flood potential exists, except for tempo- <br />rary storage of flood waters to prevent downstream flooding. <br />d. Whenever water is stored in flood control space, releases <br />should be made at r.laximum rates that do not cause substantial damage <br />downstream, subject to limiting controls on the rate-of-change of release <br />and subject to unforeseen emergency conditions. <br />e. Reduction in target release rates when the flood hazard is low <br />is discouraged, because such intenmittent protection encourages devel- <br />opment in low areas that can inhibit important flood releases in the <br />future. <br />f. r1aintenance of channel capacities and proper management of <br />flood plains downstream of reservoirs is especially important for main- <br />taining reservoir release capability. <br />.9.. The operation of very large outlet gates and particularly the <br />operation of spill~lay gates can be extremely hazardous and should be <br />strictly regulated by the use of emergency release rules. <br />The methods and guides presented in the fOllowing chapters are <br />intended to be consistent with these principles. <br /> <br />1-02 <br />