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<br />111-13 <br /> <br />General Reach to Reach Sensitivitf. The investigations of various <br />schemes revealed the gulch sensitivities to alternative improvements <br />in various reaches. The Maple Grove Reservoir provides somewhat of <br />a breakpoint between the upper and lower reaches, since channel improve- <br />ments do not significantly change the flows below. <br /> <br />The channel ization of flow through the trai ler COLlrts would not increase <br />the peak discharge significantlY. <br /> <br />The channelization of flow below Maple Grove Reservoir would increase <br />the required channel capacity from Ki~ing Street to Clear Creek. <br /> <br />Channelization of Reach 3 would significantly increase peak fJo", rates <br />and subsequent flooding in the upper residential area of Reach 6. <br /> <br />Maple Grove Reservoir. The routing of flood waters through Maple Grove <br />Reservoir has quite a pronounced effect on the downstream flood flOlvs. <br />This is due to the storm water stora<je capabi 1 ity of the reservoi r <br />coupled with the ability to release waters at a lower rate than incoming <br />flows. As can be Seen in Table 111..2, the effect 011 strearnflo", wi thout <br />Maple Grove Reservoir increases the flow about 75% over having the exist- <br />ing facility in place. <br /> <br />The reader can refer to Section IX for an evaluation of Map.le Grove <br />Reservoir. <br />