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<br />'.=) <br /> <br />~ <br />Q.:) <br />,.~) <br />~ <br /> <br />38. The results of applying consolidation effect to the sediment <br /> <br />deposited are shown in the last column of table 12 and were used to <br /> <br />construct the bar graph shown on plate 26. The estimated deposition <br /> <br />from the suspended sediment load is slightly higher than the sediment <br /> <br />deposition calculated from the reservoir resurveys. There is considerably <br /> <br />less divergence in the two methods and this is probably due to the readjust- <br /> <br />ment of the resurvey data following the 1968 aerial topographic survey. <br /> <br />39. The change in capacity in the vertical segments of the reservoir <br /> <br />is shown for the 1966, 1968, and 1972 surveys in table 13. The reservoir <br /> <br />capacity decreased considerably between the 1966 and 1968 surveys but an <br /> <br />increase in capacity occurred between the 1968 and 1972 surveys. The <br /> <br />greater part of the storage 1055 <br /> <br />in the earlier period can be ~!!ributed <br />---- ------ - - -. ----._- --------- <br /> <br />computation whereas the storage gain in <br /> <br />to the Constant Factor Method of <br /> <br />the later period can be traced to compaction of previously deposited sediment <br /> <br />and inward erosion. <br /> <br />40. Trap efficiency of John Martin Reservoir. John Martin Reservoir <br /> <br />is operated as a multiple-purposc reservoir. Platc 2 shows <br /> <br />the monthly <br />J <br />the highly var- <br /> <br />reservoir stage from January 1943 thru March 1973 and shows <br /> <br />iable operation procedure. This is reflected in the trap efficiency of the <br /> <br />reservoir. When liater is stored in the reservoir the trap efficiency is in <br /> <br />excess. of 90 percent but approaches zero percent when riverflow is routed <br /> <br />through the reservoir. An investigation of 4 years, 1968 thru 1971 was <br /> <br />made for p~riods when there was irrigation storage, and for periods when <br /> <br />there was no irrigation storage to compare sediment inflow and outflow for <br /> <br />these periods separately. With the irrigation pool, the trap efficiency <br /> <br />18 <br />