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<br />Table 4 <br />Sensitivity of Breach Parameters <br /> <br />Side <br />Slooe <br /> <br />Bottom <br />Width <br /> <br />Time <br />To Form <br /> <br />Bottom <br />Elevation <br />(ft. m.s.1.) <br /> <br />Peak <br />Outflow <br />(c.f. s.) <br /> <br />Peaking <br />Time <br /> <br />. . . Effect of varying time to form breach . . <br /> <br />Vertical <br />Vertical <br />Vertical <br /> <br />500 ft. <br />500 ft. <br />500 ft. <br />. . Effect <br /> <br />2 hrs 5550 <br />3 hrs 5550 <br />4 hrs 5550 <br />of varying bottom elevation <br /> <br />1.31(E06) <br />1.24(E06) <br />1. 13(E06) <br />of breach <br /> <br />11.9 <br />12.9 <br />13.9 <br /> <br />hrs <br />hrs <br />hrs <br /> <br />Vertical <br />Vertical <br /> <br />500 ft. 3 hrs 5550 <br />500 ft. 3 hrs 5514 <br />, Effect of varying bottom width <br /> <br />1. 24(E06) <br />1. 79 (E06) <br />of breach , <br /> <br />12.9 hrs <br />12.9 hrs <br /> <br />Vertical 500 ft. 3 hrs 5514 1. 79(E06) 12.9 hrs <br />Vertical 400 ft. 3 hrs 5514 1. 56 (E06) 12.9 hrs <br /> Effect of varying side slope of breach <br />Vertical 500 ft. 3 hrs 5514 1. 79(E06) 12.9 hrs <br />1:1 500 ft. 3 hrs 55}4 1. 91 (E06 ) 12.9 hrs <br /> Final Set of Breach Parameters <br />Vertical 425 ft. 2 hrs 5500 2.02(E06) 14 . 0 hrs <br /> <br />The model is quite sensitive to all of the parameters tested, particularly <br /> <br />the parameters which deal with the size of the breach (i.e., bottom elevation, <br /> <br />side slope, and bottom width of the breach.) Based on this sensitivity study, the <br /> <br /> <br />guidelines given in the DAMBRK Users Man1,lal, and the geotechnical characteristics <br /> <br /> <br />of Cherry Creek Dam, the following breach parameters were fixed in the model: <br /> <br />Breach Width <br />Side Slope of Breach <br />Bottom Elevation of Breach <br /> <br />425 feet <br /> <br />Vertical <br /> <br />Failure Time <br /> <br />5500.0 feet m.s,l. <br />2 hours <br /> <br />22 <br />