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<br />1 <br />1 <br />I-d <br />1,---- -, .., <br />" <br /> <br /> <br />I <br /> <br />I <br />I <br /> <br />I:'::',:: <br />.. <br /> <br /> <br />I <br />I'~" <br />IH <br />I <br />I <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Substituting the values for Stagecoach dam we have: <br /> <br />Qp = 1.50 (362) (135-10)1.5 <br />= 758,866 cfs <br /> <br />, <br /> <br />The outlet works in both Stagecoach dam (450 cfs <br />maximum) and Lake Catamount dam (480 cfs maximum) were <br />assumed to be closed at the time of failure. <br /> <br />The volume of water in Stagecoach reservoir <br />available for flooding is the normal operating volume <br />less any volume that remains in the reservoir below the <br />level of the breach. Since the depth of the breach at <br />Stagecoach dam was taken as the full heigth of the dam <br />(H), less the freeboard (FB), or <br /> <br />(1.00) (H-FB) <br />= (135 - 10) <br />= 125 feet. <br /> <br />,.. This is at elevation 7,075 feet above mean sea <br />level, and corresponds to a total available volume of <br />33,275 acre-feet. <br /> <br />For the DWR model, the Yampa River between <br />Stagecoach dam and Lake Catamount dam was divided into <br />three stream reaches. The stream reaches are shown in <br />the following schematic diagrams, and the trapezoidal <br />valley cross section data used to typify each reach is <br />shown in Table 2. <br /> <br />II <br />