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The 1965 floods were designed to raise the elevation of
Lake Mead reservoir and to scour the reach immediately
below Glen Canyon Dam in order to increase the efficiency
of the power plant at the dam, and were referred to informally by Bureau of
Reclamation engineers as "channel cleaning flows"
(Grams and others, Utah State University, written
commun., 2002). During these 3 months of high
discharge, approximately 5.0 million tons of fine sediment
(that is, sand and finer material) were scoured from Glen
Canyon between the dam and Lees Ferry (computed on
the basis of the USGS daily suspended-sediment data
from the Lees Ferry gaging station; U.S. Geological
Survey, accessed November 15, 2000), and approximately
17.6 million tons of fine sediment were scoured from the
reach between the Lees Ferry and Grand Canyon gaging
stations (Rubin and Topping, 2001). Pages 46-47 [1]
 [2]
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