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than the upper structures. These lower structures were designed to provide for boating that <br />is not intimidating, that allows for greater instructional and novice to intermediate usage, as <br />well as extended deep water boating during the off - season. As such the flow regime for <br />these structures was defined by a different set of intended uses. These flows and uses are <br />listed in Table 2: <br />Flow Regime <br />The Durango Boating Park - -Lower Structures <br />Dates <br />Flow Rate <br />Usage <br />Structures <br />#10&#11 <br />#12 <br />1 -Jan <br />185 <br />185 <br />Winter training for local and visiting athletes as well as winter recreational <br />boaters <br />14 -Mar <br />15 -Mar <br />250 <br />250 <br />Increased power for winter training and recreational boaters <br />3 -Ma <br />1-Apr <br />400 <br />400 <br />Increased power for winter training, beginning of freestyle skills practice and <br />recreational boater tune -up <br />14-Apr <br />850 <br />850 <br />Early season attraction, spring training freestyle /slalom, recreational boating <br />30-A Dr. <br />1-May, <br />900 <br />900 <br />Boating alternate attraction, whitewater destination, alternate novice /medium <br />level experience commercial rafting, instructional <br />14-May <br />15-May <br />900 <br />900 <br />Boating alternate attraction, whitewater destination, alternate novice /medium <br />level experience commercial rafting, instructional <br />31 -May <br />1 -Jun <br />1250 <br />900 <br />Tourist attraction, whitewater destination, alternate novice /medium level <br />experience commercial rafting, instructional <br />14 -Jun <br />15 -Jun <br />900 <br />900 <br />Boating alternate attraction, whitewater destination, alternate novice /medium <br />level experience commercial rafting, instructional <br />n <br />1 -Jul <br />600 <br />600 <br />Mid -to -late season boating alternate attraction, instructional inflatable traffic, <br />commercial rafting, hard boat recreational usage and training for local athletes <br />14 -Jul <br />15 <br />600 <br />400 <br />Mid -to -late season attraction, instructional, inflatable traffic, commercial rafting, <br />hard boat recreational usage and training for local athletes. Alternate boating <br />in (structure 12) <br />1 -Aua <br />400 <br />400 <br />Late season attraction, instructional inflatable traffic, commercial rafting, hard <br />boat recreational usage and training for local athletes <br />14-Auci <br />15-Aua, <br />300 <br />300 <br />Hard boat recreational usage, inflatable /inner tube usage, ducky trips, <br />instructional and training for local athletes <br />30-Sep <br />1 -Oct <br />185 <br />1 <br />185 <br />1 <br />Winter training for local and visiting athletes as well as winter recreational <br />boaters <br />31 -Dec <br />Table 2. Minimum flow regime for the lower structures of the Durango Boating Park to <br />provide for the intended whitewater usage. <br />Given the dimensions of the upper section of the reach in comparison with the lower <br />section, the structures at the site can be designed to accommodate the specified flow regime <br />and provide for the City's intended usages at each site. <br />35 <br />