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<br />1~ :;~ ., q. (1 <br />00(.J0J <br /> <br /> High Flow Characteristics <br /> Constant Width Depth Endflow <br />,c< "D" Hole .., -.... 3 65 ---- 3. c 1860 <br /> Charlie's Hole 3 70 4 1900 <br /> <br />Table 1. Flow characteristics at the "D" hole and Charlie's hole <br /> <br />Table 1 shows that the high flow at the D hole is 1860 cfs. At this flow the entire river is <br />captured and controlled. At flows that are greater than this flow the structure will continue to <br />create a hydraulic and contain the floW but the play feature will become less efficient until the <br />structure will be overtopped. When the structure is overtopped it will become insignificant to the <br />flow and will not significantly affect the 100- year floodplain. <br /> <br />Table 1 also shows that the high f16wfor Charlie's Role is 1900 cfs. At this flow the <br />entire river is captllred and-controlled. -Sirni]arly, this structure will continue to function and will <br />contain the flow until it is overtopped.' At extreme floods this structure will not significantly" <br />affect the 100-year floodplain. <br /> <br />_._n ---';:;:;=-c <br /> <br />It is my opinion that the Park is capable of diverting, capturing, and controlling water <br />within the river channel at maximum flow rates up to 1900 cfs. These structures divert, capture <br />and control these flows efficiently and without waste. It is also my opinion that these structures <br />do not affect the 100- year floodplain. These structures were designed at grade to mimic the <br />natural shape of the streambed and they do not significantly decrease the cross-sectional area of <br />the streambed at their location. Numerous HEC- RAS models of similar structures in similar <br />rivers have shown that these structures do not create a flood hazard. <br /> <br />-12- <br />