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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 />cI3,oslf!)! _Wash Drainage ~,as!~r_Plan <br /> <br />; ,~d ~ <br /> <br /> <br />,Phase 2: Alte17Zative Drainage Facility Evaluation <br /> <br />sediment control, should be undertaken at regular intervals and immediately following <br />significant rainfall events. <br /> <br />Of particular concern are those structures within which significant amounts of sediment <br />may accumulate. These structures are generally located near the top of the Watershed <br />where the greatest sediment load exists. As has been noted, the culverts crossing 1-70 <br />limit the amount of sediment entering the system. However, medium and fine sized <br />particles may flow through those culverts and make their way to structures further <br />downstream. These sediments may accumulate, particularly during dry periods, in some <br />of the culverts along the Bosley Wash main stem. Any alternative should include a <br />routine maintenance program that includes regular inspections and cleanings when <br /> <br />necessary. <br /> <br />The Government Highline Canal represents a structure that presents considerable <br />challenges. Particular attention should be paid to the maintenance of the siphon at the <br />Government Highline Canal. Siphons are generally more susceptible to debris and <br />sediment accumulations due to their geometry. More frequent inspection should be <br />undertaken. This canal also' represents an operational challenge from the standpoint of <br />potential overflows. While this study does not depict diversions of stormwater into the <br />canal, the possibility of some available excess capacity in the canal does exist. This could <br />serve to intercept large flows and convey them out of the Watershed. Equally likely is the <br />possibility of having flows from other Watersheds directed toward this Watershed. For <br />this study, it was concluded that the capacity of the canal is very consistent and that <br />limited conveyance is available to change the direction or amount of flows in Bosley <br />Wash. To assure that this assumption is valid, we suggest that no major operational <br />changes be entertained. <br /> <br />4.0 AL TERNA TIVE DEVELOPMENT <br /> <br />4.1 General <br /> <br />The elements identified in this study represent several components that can be combined <br />to create a system of improvements that address flooding problems within Bosley Wash. <br /> <br /> <br />; " ,- <br />~-~'...;;.:~:~~-- <br /> <br /> <br />/------,\ <br />R~ <br />~:;: <br /> <br />@l. <br /> <br /> <br />Page 16 <br />