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<br />',"'"') <br /> <br />~ I~as 97.2 percent but during limited storage and ri verflow periods it <br />c...) <br />W was only 40.5 percent. The last column of table 8 shows the annual <br /> <br />trap efficiency of the reservoir since October 1942. The annual figures <br /> <br />ranged from zero percent in 1964 to 99 percent in several years. The <br /> <br />trap efficiency for the period October 1942 through March 1972 was <br />computed to be 87.5 percent. <br /> <br />S~IARY AND CONCLUSIONS <br /> <br />41. Summary. Results of the latest resurvey including the trends, <br />conclusions and recommendations are summarized in the following paragraphs. <br /> <br />This is the ninth resurvey of the sediment ranges at John ~Iartin Reservoir <br /> <br />since the original survey of April 1942. The total reservoir depletion <br /> <br />has been 80,449 acre-feet for an average annual depletion of 2,682 acre- <br /> <br />feet. This has been 11.46 percent of the original capacity. Depletion of <br /> <br />the flood control pool (above elevation 3,851.0) has been 8,264 acre-feet <br /> <br />or 3.00 percent. Depletion of the conservation pool (below elevation <br /> <br />3,851.0) has heen 72,185 acre-feet or 17.1 percent. The highest 'reservoir <br /> <br />elevation has been 3,856.16 feet. This was 25 August 1965. Reservoir <br /> <br />stages for the period of operation are shown on plate 2. Operation of the <br /> <br />reservoir since April 1968 has been for irrigation storage from November <br /> <br />through March and inflow equal to outflow for the remaining period sub- <br /> <br />sequent to depletion of irrigation storage except for short duration storages <br /> <br />when runoff was high. <br /> <br />19 <br />