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<br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br /> <br />Bosl~y Wash Drainag~ Master. Plan <br /> <br /> <br /> <br />Phase 2: Alternative Drainage Facility Evaluation <br /> <br />The project sponsors also presented their interpretations of the causes of flooding in the <br />Watershed. The basis for flooding identified in this study is largely the high runoff <br />resulting from intense rainfalls. Operational issues such as inconsistent maintenance or <br />canal operations were considered, but were not included as the primary cause of problems <br />within the Watershed. This conclusion was reached based on conversations with the <br /> <br />County and GJDD that described rather routine maintenance and limited debris. This <br />study recognizes the potential for debris within the Vvatershed, but concluded that most of <br />the high debris loads are generated in the upper Watershed and would be intercepted by <br />the culverts under 1-70. <br /> <br />The participants in the public meeting did identify debris as a contributing problem for <br /> <br />. . <br />many of the areas with~n Bosley Wash. Specific areas mentioned were the Hwy 6/UPRR <br />and the Government Highline Canal structure. In both cases, it was noted that the culverts <br />could be as much as two-thirds full of sediment at any time. While an obvious concern, <br />the inclusion of such variable sediment obstruction is beyond the scope of this study. <br />However, the sponsors did commit to including recognition of the sediment potential and <br />incorporating the recommendation of routine maintenance in the final plan. In fact, a <br />general maintenance schedule is to be included in the final plan. <br /> <br />One citizen noted some problems associated with facilities along 43 % Road in the <br />vicinity of Bower's Drain. While this may have an impact on local flooding, and may <br />have some relation to flooding along F % Road, this area is outside the scope of this <br />project. Due to limited funding, the scope of this pr~ject was limited to the identification <br />of flooding problems along the Stub Ditch channel and the Bosley Wash main stem. <br />Other areas of flooding within the Watershed that are identified will be mentioned, but <br />will not be evaluated in detail. <br /> <br />Miller's diversion, on the lower portion of Bosley Wash, below the Hwy 6/UPRR <br />crossing was also identified as a potential problem area. The diversion consists of a gate <br />with manually installed stop logs. The structure is difficult to operate during times of <br />flood and is often not opened as a result. In that case, the diversion can cause a backwater <br />along Bosley Wash that may result in channel overtopping upstream. This study assumed <br /> <br />.";\,;j.f~ij;t/"r., <br />.... ~" <br />i~' ~,: <br />"'hl;:~j!:;~~lt~~f <br /> <br />ij) <br /> <br />Page 8 <br /> <br />~'" <br />~ <br /> <br />@'1 <br />