Abstract
The present study describes sediment discharge over the side weir and bed variation in a straight open channel, which are associated with sediment problems of a bypass channel. Energy losses due to the useage of side weir are discussed experi-mentally in the case that total flow discharge is drained from the weir. Sediment discharge over the side weir and bed variation are predicted well in terms of one dimensional governing equations and the results of the energy losses. It is basically important to estimate how water and sediment are diverted to a side weir in the case that part of the flow discharge is drained over the side weir. A simple method for predicting the diversion ratios of sediment as well as of flow water is developed. Calculated results of the ratios coincide with experimental data.
