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<br />g <br /> <br />1<.. <br />~. <br />, <br /> <br />~...<.~. <br />~';- <br />1>;- <br /> <br />:,,1 <br />'~:-1 <br />:,.'1 <br />,ON <br /> <br />H <br /> <br />'-'.; <br />('~ <br /> <br />1.-. <br />, <br />i "~:! <br />1'<.1 <br /> <br />~J <br /> <br />.< <br />.~. <br />f; <br /> <br />I, <br />I! <br /> <br />,;-"~-- -,-,~._- <br /> <br />13 <br /> <br />t'- <br />CD <br /> <br />,,:_, <br /> <br />-< <br />'-' <br />l_,) <br /> <br />VII CONCLUSIONS <br /> <br />The existing diversion structure is inadequate for administra- <br /> <br />tive purposes and is in imminent danger of failure from continued <br /> <br />use. It is especially exposed to damage from high runoff or flash <br /> <br />floods. There is no question in the writer's mind that it should <br /> <br />be replaced as soon as possible. Its only value is for control of <br /> <br />water during the construction period. Following construction it <br /> <br />should be removed as Soon as possible as it would then constitute <br /> <br />a hazard to the new structure. It does have considerable value dur- <br /> <br />ing the construction period as it will serve as a coffer dam and <br />afford a means of control for administrative purposes and to protect <br /> <br />the new construction. <br /> <br />Canal lining for the upper 2000 feet of Cerro Canal, from the <br /> <br />headgate to the highway crossing, should be considered as part of <br /> <br />this project. Cerro Canal runs substantially parallel to Costilla <br /> <br />Creek for this distance in alluvium through which water losses are <br /> <br />important even though not high. <br /> <br />No alternative was found for the replacement of the diversion <br /> <br />structure during this study. It is felt that any attempt to restore <br /> <br />the existing structure would be a temporary measure and eventually <br /> <br />result in costs exceeding that required for a permanent solution. <br />