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<br />0017 J~ <br /> <br />Monthly Sediment Accumulation (acre-feet) <br /> <br />Fl ami ng <br />Go rge <br /> <br />Navajo <br /> <br />Lake <br />Po we 11 <br /> <br />Lake <br />Mead <br /> <br />Jan <br /> <br />o <br />o <br />o <br /> <br />o <br />o <br />o <br />830 <br /> <br />3,125 <br /> <br />3,208 <br />3,208 <br /> <br />Feb <br /> <br />3,125 <br /> <br />Mar <br /> <br />3,125 <br /> <br />3,208 <br /> <br />Apr <br />May <br /> <br />500 <br />500 <br /> <br />9,000 <br /> <br />3,208 <br /> <br />Jun <br /> <br />500 <br />500 <br />o <br />o <br /> <br />830 <br />830 <br /> <br />9,000 <br />9,000 <br /> <br />3,208 <br />3,208 <br /> <br />, <br />.1 <br /> <br />Jul <br /> <br />830 <br /> <br />9,000 <br /> <br />3,208 <br /> <br />1 <br />I <br /> <br />J <br /> <br />Nov <br /> <br />o <br /> <br />o <br />o <br />o <br /> <br />3,125 <br />3,125 <br />3,125 <br />3,125 <br /> <br />3,208 <br />3,208 <br /> <br />Aug <br />Sep <br />Oct <br /> <br />o <br /> <br />o <br /> <br />o <br /> <br />3,208 <br />3,208 <br /> <br />Total <br /> <br />o <br />2,000 <br /> <br />3,125 <br /> <br />3,208 <br /> <br />~ <br /> <br />Dec <br /> <br />3,320 <br /> <br />61,000 <br /> <br />38,500 <br /> <br />, . <br />I' <br /> <br />These sediment volumes were estimated by averaging the results of the <br />Lane and Koelzer unit weight method and the Trask unit weight method <br />over the 1944 through 1960 time frame (reference: May 1962, <br />Sedimentation Study, Glen Canyon Dam, CRSP). In order to simplify <br />the sediment procedure, the annual sediment volume is constant from <br />year to year, rather than being a function of inflow. <br /> <br />Si nce a si gnifi cant amount of sediment has depositedi n these reser- <br />voirs since their closure, the area-capacity coefficients used by the <br />CRSM have been modified (1984) to reflect this accumulation. During <br />a model simulation, these area-capacity coefficients are changed <br />every month to reflect the amount of sediment accumulation shown in <br />the above table. Only the portion of sediment that accumulates in <br />live capacity is used in updating the area-capacity coefficients. <br />The volume that accumulates in live capacity is determined according <br />to a Type II (Flood plain-Foothill) sediment distribution as defined <br />in "Distribution of Sediment in Large Reservoirs," by Borland and <br />Miller. Other mOdeling parameters like live and active capacity, <br />current contents, and dead storage volume are also updated monthly to <br />account for the sediment deposition. <br /> <br />l, <br /> <br />, <br />I <br />I <br />; <br />I' <br />1 <br />I, <br /> <br />1 <br />I. <br />i <br />i <br /> <br />53 <br />