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<br />,. <br /> <br />048,~ <br /> <br />. <br /> <br />for maintenance activities would necessitate the hiring of temporary <br />labor and probably rental of additional equipment to accomplish the <br />required annual maintenance tasks. Only the change in operation and <br />maintenance costs attributable to ground-water recharge operations <br />would be charged to the annual costs of the ground-water alternatives. <br /> <br />, Sediment <br /> <br />would be adversely <br />sediment <br />that -I be removed <br /> <br />Since the seepage rates of the re~~' ge ponds and th~ unlined canals <br />r::.... -~ . sed1ment... <br />affected by any'accu ulat10n of I 1t 1S 1mportant <br />f:'....- , ~ <br />from the" ~ste~~ffectively. An estimate was made <br />". ' <br />sediment ,) <br />of the average amount of II 'whicH would be diverted by a ground-water <br />I sedimllnt <br />recharge system based orithe / ~J load occurring in divertible flows. <br />,...... .~ <br /> <br />The amount of sedim~<:di~:d by canals in the reach between Weldona <br /> <br />and Julesburg forC~~~~~ater recharge is estimated to average 84 acre- <br /> <br />feet per year. This~s determined by using the flow-duration curve, <br /> <br />Figure 16. and the sediment rating curve, Figure 21, from the June 1951 <br /> <br />Sediment Control Appendix of the Definite Plan Report, Narrows Unit. <br /> <br />By assuming that the sediment concentration diverted by the recharge <br />canals will remain the same as in the river and that the average annual <br />river diversion will be 81,800 acre-feet, 35 percent of the streamflow <br />is diverted into the recharge canals, as well as 35 percent of the <br />suspended sediment.' Based on a unit weight for the suspended sediment <br />of 78.5 pounds per cubic foot or 1,710 tons per acre-foot, the average <br />annual sediment load of 84 acre-feet is not expected to dramatically <br />reduce recharge infiltration rates during one irrigation season. <br />