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<br />CREEl< BASIN <br /> <br />1 <br />, <br /> <br />, <br />" <br />',' <br />I , <br />',' <br /> <br />AS <br />\:,:;,LAKE <br />~~ ~ <br />\.~, <br /> <br />Hydrologic Investigation <br /> <br />" <br />CACHE LA POU~~ <br />RIVER "..-~ <br />STUDY REACH <br />fiQRSETOOTH AESER'vQJR~ <br /> <br />t " <br />II ~1 \ <br />\1 <br />II <br />-N- \ \ <br />j " <br />" \\ <br />,\ ) <br />'^f <br />& <br /> <br />,,<~ <br />" <br /> <br />f\COBB <br />" <br />( , <br />',' <br /> <br />LAKE <br /> <br />A detailed computer model was used to simulate runoff <br />hydrographs, establishing peak discharges for the 2-year, <br />S-year, IO-year, 50-year, IOO-year and SOD-year frequency <br />flood events for selected basin conditions. <br /> <br />Hydraulic Analysis <br /> <br />" <br />il.TIMNATH <br />~ RESffiVOIR <br />I""'" C~WINDSOR <br />'............~ 'Il~ RESEfM)IR <br />'\ ( I <br />'\ " <br /> <br />Water surface profiles were determined throughout the study <br />reach for the IO-year, 50-year, IOO-yeaJ: and SOD-year events. <br />A floodway OJ: high hazard flood channel was identified for the <br />IOO-year event. <br /> <br />25 <br /> <br />Damage Assessment <br /> <br /> <br />00<0 <br />CAIOE <br />287 l\) <br />/\I;;Y <br />'" <br />.ll",( <br />---,,' <br />, , <br />, ( <br />" <br /> <br />,+l' <br /><"---~% <br /> <br />Flood plains for the 2-year, IO-year, 50-year, IOO-year and <br />SOD-year events were plotted on the topographic mapping and <br />structures located in each of these flood plains were identified. <br />rhe depth of flooding ~t cach o~ t~csc structures ~~d a valuatio~ <br />of the property was used to estimate total damages for each <br />flood event. An average annual flood da~age was determined from <br />this information. <br /> <br />Development of Alternatives <br /> <br />Improvement plans were identified that would mitigate or alleviate <br />the flood hazards along Dry Creek. These plans inCl\lded structural <br />and non-structural alternatives. <br /> <br />VICINITY <br /> <br />MAP <br /> <br />DRY CREEK <br />DRAINAGEW A Y PLANNING <br /> <br />- 5- <br />