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<br />years respectively. This freeboard requireme.nt was used in all of l:he Cherry <br /> <br />Creek Reservoir routings which used a starting; pool at half-full. <br /> <br />BREACH PARAMETERS <br /> <br />The National Weather Service's DAMBRK computer program requires the user to <br /> <br />specify breach parameters. Included are: the pool elevation at which the breach <br /> <br />begins; the side slope, bottom width, and bottom elevation of the breach; and the <br /> <br />time required for the breach to reach its maxirnum size. Since 1:here are no well <br /> <br />defined methods for determining the appropriat:e values I a sensitivity study was <br /> <br />done to evaluate the effect of varying these parameters. In the sensitivity <br /> <br />study, the dam was assumed to fail when tht= pool elevation reached the bottom of <br /> <br />the freeboard zone, elevation 5639.5 feet m.s.J.. The results of the sensitivity <br /> <br /> <br />study are shown in table 4. Also shown in table 4 are the peak discharge and <br /> <br />peaking times for the final set of breach parameters. Note t:hat in the final <br /> <br /> <br />run, the dam was assumed to fail when the flow over the top of the dam was <br /> <br />1/2-foot deep, elevation 5645.0 feet m,s.l. <br /> <br />21 <br />