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<br />, <br />, <br /> <br />No summary sheets were prepared for No. Weir and So. Weir Gulches <br />as potential flood damage is relatively low and plausible alter- <br />natives obviously could not be justified based on the benefitl <br />cost analysis theory. <br /> <br />SELECTION PROCESS <br /> <br />In nearly every case, the basic reason for selecting the 10 year <br />storm frequency as the design frequency was to achieve the maximum <br />amount in benefits for the minimum cost. This is the same as <br />maximizing the benefit/cost ratio. In every case the most <br />inexpensive alternative was selected except for two reaches on <br />Weir Gulch in Denver, as discussed in the previous section. <br /> <br />In only one instance was the benefit/cost ratio greater than <br />one. This, of course, was to be expected as was discussed in <br />the Section IVan the Benefit/Cost Analysis. Overall, the b..nefit/ <br />cost ratio for Weir Gulch was 1.13 and for Sanderson Gulch (not <br />including NO. Sanderson) was 0.83. <br /> <br />RECOMMENDED ALTERNATIVES <br /> <br />The recommended alternatives which came out of the Phase A study <br />and which were selected for more detailed analysis are presented <br />in the summary reports prepared by the Urban Drainage and Flood <br />Control District, entitled "Recommendation for Improvements to <br />Sanderson and No. Sanderson Gulches" dated April 18, 1972 and <br />"Recommendations for Improvements to North Weir Clnd South Weir <br />Gulches" dated May 16, 1972. The"" recommendations were approved <br />by the Board of Directors of the Urban Drainage and Flood Control <br />District. <br /> <br />The Phase A reco!l1m/!'ndations havf' basically bf'en inrorprH'atArl into <br />the Master Plan a~ rAcoffimAnded, with only a few revisions. On <br />Sanderson Gulch an additional culvert was installed at Arkansas <br />to lower the frequency of flooding of houses along Florida AVe. <br />Also, revisions were made to the Green Gables Golf Course <br />entrance road which were not anticipated in Phase A. This was <br />a result of discrepancies in the 5 foot contour interval mapping. <br />On Weir Gulch, the Federal Blvd. Detention Pond was considered <br />and found feasible for additional detention. These revisions <br />from the origLnal recommendations are discussed in more detail <br />in Section VIII. <br /> <br />-79- <br />