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<br />9 <br />."~) <br />N <br />00 <br /> <br />care should be taken because much of the reservoir is subject to inter- <br /> <br />QO <br /> <br />mittent periods of inWldation and produces sediment densities that are <br /> <br />( ~ <br /> <br />highly vari ab Ie. <br /> <br />53. The original provision fOT sediment storage in the reservoir is <br /> <br />considered adequate based on the experienced rate of sediment deposition <br /> <br />during the 30.0 years of operation included in the last resurvey. The <br /> <br />reserve for sediment deposition during design of the John Martin Project. <br /> <br />was 250,000 acre- feet. This \;as based on a 50-year period 0 f 5,000 acre- <br /> <br />feet per year and an estimated average yearly streamflow of 350,000 acre- <br /> <br />feet. Experienced loss of storage has been about 80,450 acre-feet for <br /> <br />30.0 years or 2,680 acre-feet per year with an average yearly stream flow <br /> <br />of about 251,400 acre-feet. <br /> <br />54. The next resurvey of John Martin Reservoir will be a combination <br /> <br />of sounding lines and range line profiles. Sounding lines are usually run <br /> <br />in late March when irrigation storage is at a peak. Range line profiles <br /> <br />are surveyed a little later when the reservoir is nonnaUy dry. <br /> <br />'. " <br /> <br />24 <br />