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ABSTRACT
A stream bed undergoes parallel degradation due to preferential transport of sediments clear water released from a large dam. Progressive coarsening leading to the formation of I static armour coat eventually stops the degradation process for a given flow conditions. Mc elling of this process presents complexity due to nonuniform nature of the bed material and transient nature. A conceptual model for parallel degradation has been developed and tested using laboratory data collected by different investigators and is presented in this paper. 1 model has been tested for a field situation also.