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<br />This 1,600 foot~long diversion would outlet into a 6' x 51' grass~ <br />-lined trapezoidal channel to the Uncompahgre River. Upstream of the <br />diversion, at South 9th and South 12th Streets, concrete bridges would <br />be required to replace the existing undersized culverts. A bridge <br />is also necessary where the di vers i on channe-I crosses the Denver <br />and Rio Grande Western Railroad. All present crossing structures <br />from South 7th Street downstream would be adequate with this plan. <br /> <br />The advantages of this plan are slightly lower cost, a minimal amount <br />of construction in the downstream area and the fact that much of <br />the local urban drainage into Montrose Arroyo is diverted away from <br />the channel in the developed area. Th(~ major' disadvantage is that 88 <br />percent of the total construction cost is for the diversion. Th-is <br />means that virtually the entire project would be constructed at one <br />time and would require immediate financing of the total project. <br /> <br />Plan 3 ~ This plan calls for increasing the capacity of the crossing <br />structures to convey the 100-year d-j scharge (1,100 cfs) throughout <br />the city. The overall capacity of Montrose Arroyo is limited by the <br />undersized culverts that exist at road crossings. The natural channel <br />between crossings has sufficient capacity to pass a 100--year flood; <br />therefore, no channel dredging or improvement is necessary. A total <br />of 10 road crossings from South 12th Street to North 7th Street are <br />currently undersized and would have to bE! improved or replaced. The <br />location of these crossings and the proposed improvements follow: <br /> <br />~ 25 ~ <br />