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<br />safely pass the spillway design flood occurring at a time when the <br />reservoir is as full as could occur in advance of such a flood, adhering <br />to the specific rules by which the project would be operated under such <br />conditions. The spillway operation must not be dependent on communi- <br />cations that are subject to failure or on expert analysis that might <br />not be available at the time. <br />During floods that make use of the spillway and result in down- <br />stream flows that are damaging, the foll~ling precautions are necessary: <br />~. Outlet and spillway gates should not be opened so rapidly that <br />damaging flows downstream will be larger than would occur without the <br />project. <br />b. Opening of gates must start early enough to allow an orderly <br />opening of the gates to their full capacity without storing water above <br />the maximum safe level in the reservoir. <br />~. namaging flows should not be released before it is certain <br />that the flood cannot be completely controlled, but should be released <br />at a specified rate as an emergency measure as early as is feasible <br />after it is certain the flows of that magnitude or larger are inevitable <br />and would have occurred by that time without the project. <br />Induced surcharge operation may be used to exercise partial con- <br />trol over outflow rates after the reservoir has filled to the static- <br />full-pool level. Induced surcharge storage is storage above the static- <br />full-pool. Regulation is accomplished by raising all gates by small <br />increments, forcing into surcharge storage all inflow in excess of the <br />discharge capacity of the spillway with the gates at selected openings. <br />The elevation attained and volume of induced surcharge used will vary <br /> <br />6-02 <br /> <br />j <br />