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S&VLLR

SEDIMENT AND VOLUME OF LOCH RAVEN RESERVOIR

   This 9 page document includes graphics and text.  The fianl paragraph of the summary is excerpted as follows:

Between 1913 and 1998, about 11.23 million cubic yards of sediment were deposited in Loch Raven Reservoir.  Water volume in the reservoir has decreased from 21.445 billion gallons as calculated fromthe 1913 grid to 19.175 billion cgallons as calculated fromthe 1998 grid.  this represents an 11 perscent decrease in water volume over the past 85 years.  by including the folume of water below the elevation of the existing impoundment in 1913, water storage increases to 19.38 billion bgallons.  Sediment has accumulated at an average anual rate of about 132,000 cubic yards per year.  this rate is slower than the rate predicted during the design phase of the  reservoir.  The reservoir has accumulated athe most sediment in its upper reached and the least sediment near its dam.