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<br />reach C include benefits of channel diversions in reaches A <br />and a. Without these upstream diversions, benefit:cost ratios <br />for reach C would be further reduced. <br /> <br />Alternative #4 <br />Alternative #4 is identical to Alternative #2 except <br />design frequency is limited to the la-year event <br />throughout the developed areas. <br /> <br />For reaches A and e, a summary of results follows. <br /> <br />The benefit,cost ratio is 5.04 and net benefits are <br />$3.0 million. <br /> <br />Alternative !iiI <br />This alternative inCludes a channel diversion to Terry Lake <br />and culvert improvements in reach A, a channel diversion <br />to the Poudre River in reach B and channel improvements <br />in the vicinity of Alta Vista. Improvements are <br />designed for the IOO-year event throughout the developed <br />areas. The benefit:cost ratio is 1.53 and net benefits <br />are $1.6 million. <br /> <br />Alternative #5 <br />This plan is again similar to alternative #2. These <br />improvements, however, are designed for la-year flood <br />capacity in reach A and laO-year flood capacity in <br />reach B. <br /> <br />The benefit:cost ratio is 1.69 and net benefits are <br />$1.8 million. <br /> <br />Alternative #2 <br />This improvement plan consists of channel improvements <br />through reach A, a diversion to the poudre River in <br />reach B and channel improvements in the vicinity of Alta <br />Vist<l. The design is aqain for the lOa-year flood <br />t!vt!nt throughout developed areas. <br /> <br />The benefit,cost ratio is 1.02 and net benefits are <br />slightly positive. <br /> <br />The improvement through reach C for each of the five alternatives <br />is an improved channel throuah the Valley Airpark industrial <br />area to the poudre River. For Alternatives *1, '2 and *5, <br />the design is for the lOO-year runoff event from local drainage <br />downstream of a Poudre River diversion. Alternative t4 is a <br />design for the la-year flood event under the same conditions <br />of diversion upstream. Only Alternative '3, a lOa-year <br />frequency design, is independent of improvements in Reaches <br />A and B. <br /> <br />Alternative "1'3 <br />This alternative plan is a system of channel improvements <br />throughout the developed areas of reaches A and R Design <br />capacity is for the lOO-year flooa magnitude. The <br />benefit,cost ratio is 0.57 and, therefore, net benefits <br />are neg.'1tive. <br /> <br />The benefit:cost ratios for reach C are summarized below in <br />Table XIII. Net beneflt~ for th.""", improvements alone are <br />negative for each plan. <br /> <br />-37- <br /> <br />-36- <br />