Abstract: For the Xiangjiaba reservoir, the incoming water and sediment conditions were determined
according to its filling plan and water release rules, and calculations were conducted for the flow velocity
and the concentration and gradation of suspended load in the passages of its generators and release structures.
The caculations are used for an evaluation of the maximum grain sizes of incipient motion in certain critical
areas of the reservoir and an analysis on the influence of construction slag heap on the generators and release
structures during initial impoundment.