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CHAPTER III ALTERNATIVES Branch of Persigo Wash. The west end portion of the Government Highline Canal would have 7 miles of detention ditches and dikes. Behind the four detention dams, permanent and semipermanent ponds would be formed. Existing structures, such as bridges and control structures on the drains, washes, and creeks below the canal, would be evaluated individu- a11y during preconstruction. Any of these structures that would not safely carry the flood that the cross-drainage facilities pass would be either improved or replaced. If it is determined to be more practical to leave these structures as they are, detention dams would be con- structed on those drainages above the detention ditch and dike system. This would limit the peak floodflows to the estimated capacity of the existing downstream structures. Moss and Debris Removal Structures Two automated structures would be installed to help remove moss, debris, and other material from the irrigation water to keep the pipe laterals operational. The structures would be located to serve all laterals. One would be on the Government Highline Canal near Asbury Creek and would have a capacity of 1,650 cfs. The second would be at the beginning of the Grand Valley Canal across the river from the Orchard Mesa Pumping Plant and would have a capacity of 640 cfs. The photograph below shows a moss and debris removal structure installed on the Govern- ment Highline Canal under Stage One Development. f.. ~'' _ ~ -- -~`""' - ---'r'~~ ~`^"' ~ Mir ._ i ~ {~r ~G ~ T j - 1 t 1 ~' Y p ffll~~ i:;r~ - ~'1 i4pi%tl'il~nli ~ ~1~~ f .. ~ ~ ,~ _ 4~'~ !~, '~ ~ .~+.l~~j,! i ~~~~ -~~~ ,, , F~ ~+~• 1~~ 't~ r'4 YM1% ,. . ~ F ~ ~ ,~ ' .- ~ t r . ~ a~, ;1 ~ p~' -' jd ,. -. K ~, ,l n .. -.~ An automated structure went Highline Canal removes moss and debris from the Govern- just upstream from Stage One. 25