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<br />m'......';. <br />-:<. <br />;;:' <br /> <br />t1 <br /> <br />, <br />"',j <br /> <br />;. ~ <br />~1 <br /> <br />:: <br /> <br />~'{ <br /> <br />,..; <br /> <br />~ <br /> <br />C'J <br />c.o <br />v <br />~ <br /> <br />'..:) <br />.'" <br />L_. <br /> <br />8 <br /> <br />IV PROPOSED FACILITY <br /> <br />It is proposed, as a result of this study, that a reinforced <br />concrete diversion structure be built approximately 60 feet down- <br /> <br />stream from the existing structure with a parallel axis. Two 120 <br /> <br />by 60 inch radial gates will control low to moderate flows in Cos- <br /> <br />tilla Creek and Cerro Canal. One small radial gate, or slide gate, <br /> <br />will control flows to Acequia Madre. Flows exceeding the capacity <br /> <br />of the gates would automatically continue downstream in the creek <br /> <br />channel through overflows in the structure. During periods of high <br /> <br />flow in Costilla Creek reduction of sand loads entering Acequia <br /> <br />Madre and Cerro Canal would be accomplished by the position of the <br /> <br />gates in the diversion structure. Design would include provision <br /> <br />for construction of sand slots and waste lines from the entry sec- <br /> <br />tion of the ditches to the creek. A reduction of sand entering the <br /> <br />ditches during low flows in Costilla Creek might be accomplished by <br /> <br />designing deposition basins and waste lines in both Acequia Madre <br /> <br />and Cerro Canal. A study of bottom and suspended sand loads has <br /> <br />been carried on by U. S. Geological Survey. The results indicate <br /> <br />provisions to reduce sand loads in the ditch are justified. <br /> <br />The proposed layout is schematically presented on Plate II. <br /> <br />No foundation borings were made of the construction site. Sur- <br />