Abstract
ABSTRACT Sedimentation is a major problem in alluvial areas due to which reservoirs are losing their water storage capacity. The rivers in Himalaya especially have steep slope about 1:70 and carries heavy sediment during flood. The reservoir under such condition is likely to be silted up rapidly and sediment may enter into the intake of power development unit. Therefore removal of sediment from reservoir is of utmost importance. Different methods are available for removal of sediment, most of which are uneconomical except flushing techniques. Determination of optimum discharge for effective flushing and its duration are important aspects of flushing technique. Knowledge of bed profile at the end of one or two years should be known, so that it can be used in physical model for determination of optimum flushing discharge and duration. In this paper, the one year deposition profile at upstream of dam was obtained using HEC-6 model. Using this profile, the optimum discharge and duration of flushing were obtained using physical model for a particular case. This technique may be applicable to any river in alluvial area.
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