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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />would have to be modified. The modification includes expanding the bottom width to 20 feet and <br />reshaping the side slopes to L5H: LOV, The cross sections at bridge openings would not need to be <br />modified under this option, In areas where the existing canal is lined, the modification would include <br />removing the existing concrete, reshaping the channel cross section, and relining the channel with <br />concrete. <br /> <br />The recommended alternative for Big Barnes Ditch includes modifYing the geometry of the <br />canal and relining the existing concrete sections to increase the capacity of the canal to 1,000 cfs. <br />The existing concrete would be replaced with new concrete lining. The cross section of the canal <br />would be modified such that the bottom width would be increased to 40 feet with side slopes of <br />L5H: Lay. The new cross sectional geometry would have the same approximate top width as the <br />existing canal and would eliminate the need for additional easements. Transitional sections are <br />required between the canal section and bridges. The existing bridges have sufficient capacity to <br />convey the decreed discharge of 1,000 cfs. The water surface would rise in the canal due to the <br />increased discharge but should not significantly affect normal operations of other structures. <br /> <br />The recommended alternative for Hubbs Check structure involves removing the existing <br />structure and replacing it with a new concrete check structure. The new check structure would have <br />the same general dimensions as the original check structure as shown in Figures IV-l through IV-3. <br />The control structure will remain 29 feet wide and use an ogee crest weir to provide flow regulation, <br />The wooden bridge deck would be replaced with a simple span concrete bridge deck with new <br />handrails, supported on either side by 8-foot high retaining walls. The check structure, as well as the <br />downstream end of the Hoffinan outlet canal will be realigned to allow the canal a straighter, more <br />natural path towards the confluence with the Greeley and Loveland canal, The check structure would <br />remain 9 feet wide and contain a parshall flume directly upstream of the structure with the same <br />original dimensions, The dual gate turnout would be replaced by a turnout conduit. The same type <br />of turnout gate system would be used for flow control, but a 8-foot x 8-foot x 6-foot box culvert <br />would replace the structure. The box culvert would transition into a 3-foot-diameter 35-foot-long <br />concrete pipe, which discharges into the Hoffinan Reservoir outlet canal, directly upstream of the <br /> <br />E:\GctLREPOR. WPD <br /> <br />v <br /> <br />Man:hI7.1997 <br />