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<br />CHAPTER 3. REGULATION OF RESERVOIR DESIGN FLOOD <br /> <br />In cases where a specific observed or hypothetical reservoir <br />design flood has been adopted as a basis for establishing flood control <br />space, the amount of space required is determined by performing a <br />routing (an operation study) of that flood. Routings can be performed <br />by manual methods or by using a computer program such as HEC-5C. The <br />initial storage in the reservoir used in such a routing should be the <br />maximum storage that could reasonably be anticipated at the start of a <br />major flood. In general, this would be storage at the top of the <br />conservation pool, which includes storage required for all purposes <br />other than flood control (including a reserve for sedimentation). No <br />storage should exist in the flood control space at the start of a reser- <br />voir design flood, because this flood should include all periodS of <br />heavy runoff that would cause storage in the flood control space and <br />affect the maximum reservoir stage during that flood. <br />Releases made during the reservoir design flood are controlled by <br />outlet capacity and by target flows downstream of the reservoir. During <br />those periods when the controlling constraint is downstream of the <br />reservoir, the operation study is performed by adding the inflow volume <br />during any computation interval to the storage at the start of that <br />interval and subtracting the average release during that interval that <br />would be permitted by downstream controls. During times when releases <br />are controlled by outlet capacity or are otherwise a unique function of <br />storage, routing is performed by use of storage-indication curves, <br /> <br />~m <br />