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<br />f. A family of curves such as those shown in fig. 6.03 are appro- <br />priate for use in a central office, but relationships to be used as an <br />emergency operation schedule for damtenders are more directly usable <br />if the rate of rise of reservoir level is substituted for the inflow. <br />This is readily accomplished by obtaining the difference between the <br />volume of inflow and outflow for a selected time interval and expressing <br />the volume as a rate of rise for any particular reservoir elevation. A <br />typical family of curves is shown in fig. 6.04. The time interval to <br />be used as a basis for determining rate of rise should be based on a <br />consideration of the reservoir and drainage basin characteristics, with <br />1 to 3 hours being typical. Adjustment in gate openings at 1- or 2-hour <br />intervals is adequate for most projects. <br />A computer program Spillway Gate Regulation Curve. described in <br />Appendix 5, has been developed for computing gate regulation schedule <br />curves for a reservoir utilizing area-capacity curves. an induced sur- <br />charge envelope curve. and a constant recession constant, Ts' <br /> <br />Section 6.03. Initial Reservoir level <br /> <br />The spillway discharge capacity and peak reservoir level likely to <br />be attained during the spillway design flood will be governed by, <br />!. The spillway design flood inflow hydrograph. <br />b. The reservoir level at the beginning of the spillway design <br />flood inflow. <br />~. The plan of reservoir regulation. <br /> <br />6-09 <br />