The parallel skimming walls are regarded as one of most applicable methods for gaining decline in the amount of sediment entering the lateral intake. The parallel skimming walls are installed on the main channel, in front of the intake span, creating a rotational flow and divert the sediments from intake span, as a result the reduction in the amount of sediment entry into the intake can be realized. The present paper aims at experimentally studying the impact of length (L) and height (H) of parallel skimming walls, as well as the effect of discharge shifts associated with the main channel on controlling the inlet sediment into the in intake. First, the impact of parallel skimming walls incorporating three lengths (L = 60 cm, 75 cm, 90 cm) in front of the intake is investigated, then the impact of skimming walls incorporating three heights (H = 2 cm, 4 cm, 6 cm) is scrutinized. After each test, the sediment volume entry (V) into the intake was measured. By performing dimensional analysis, the dimensionless ratios were obtained and the relation between the variables was determined. The results demonstrated that in the case of parallel skimming walls, the increase in L and H leads to mitigation in the amount of inlet sediment into the intake. Moreover, there is a proper agreement between the procedure of this study and the previous ones.

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