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<br />with the volume and rate of reservoir inflow in individual floods and <br />the exact schedule of gate operations in each case. The maximum eleva- <br />tion of induced surcharge that is practicable to provide for in the <br />design of projects involving gated spillways usually is limited to <br />approximately 1 to 3 meters. <br /> <br />Section 6.02. Development of Emergency Release Schedules <br /> <br />In order to assure that the project operation will be able to <br />comply with necessary precautions under extreme flood conditions, it is <br />advisable to provide an emergency release diagram that uses only infor- <br />mation on reservoir data immediately available to the operator. Such <br />an operation diagram is illustrated in fig. 6.04 and is developed as <br />follows: <br />a. Develop a set of spillway-rating curves which shows the dis- <br />charge that would occur as all spillway gates are raised collectively <br />by successive increments of about 1 foot (.3 meter) until fully opened. <br />A set of curves is shown in fig. 6.01. <br />~. Construct an "induced surcharge envelope curve" from a point <br />corresponding to the nondamaging flood control release at the static- <br />full-pool elevation to the free discharge capacity of the spillway <br />corresponding to the elevation at which all gates must be fully opened. <br />This is illustrated by curve E, fig. 6.01. A straight-line connection <br />would assure the minimum rate of increase in spillway discharge under <br />critical flood conditions, and may be the proper selection in some cases. <br />However, curvature as illustrated in fig. 6.01 pemits a lower release <br /> <br />6-03 <br />