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<br />. <br /> <br />Brune curve are somewhat low. The relatively high reservoir <br />length-to-width ratio and large-course fraction of incoming <br />sediments may result in a more efficient trapping ratio than <br />Brune's work indicated. <br /> <br />TABLE 1-2 <br />ACCUMULATED SEDIMENT VOLUME AND <br />NET RESERVOIR CAPACITY <br /> <br />. <br /> <br />o <br />5 <br />10 <br />15 <br />20 <br />25 <br />30 <br />40 <br />50 <br />75 <br />100 <br /> <br />1,950 <br />3,850 <br />5,550 <br />7,200 <br />8,650 <br />10,100 <br />12,500 <br />14,600 <br />18,500 <br />18,900 <br /> <br />Net <br />Capacity <br />(ac-ft) <br /> <br />23,730 <br />21,780 <br />19,880 <br />18,180 <br />16,530 <br />15,080 <br />13,630 <br />11,230 <br />9,130 <br />5,230 <br />4,830 <br /> <br />Year <br /> <br />Accumulated <br />Volume Loss Due <br />to Sedimentation (ac-ft) <br /> <br />. <br /> <br />The above tabulation depicts the significant effect <br />sedimentation may have on the Webster Hill reservoir. Although <br />the projections of sediment load are based on only 13 actual <br />site measurements, the results appear to be reasonable. More <br />detailed study should be conducted during the next phase of the <br />project, including expansion of the data base for measured <br />suspended sediment load coupled with actual measurements of the <br />bedload. Also, a mathematical model should be developed to <br />account for the effect of reducing the ratio between the <br />reservoir capacity to inflow when the storage capacity north of <br />the rai lroad embankment is deducted from the overall reservoir <br />capacity, and to account for seasonal variations of sediment <br />inflow to the reservoir. <br /> <br />3686-a/5 <br /> <br />1-15 <br />