EVALUATION OF THE UPSTREAM WATER LEVEL OF THE FLOW OVER FINITE-LENGTH WEIRS WITH RECTANGULAR CROSS-SECTION IN THE FLOW DIRECTION

抄録

 This paper aims to formulate the upstream water level of the flow over finite-length weirs with rectangular cross-section in the flow direction in order to obtain basic information for flood management planning of rivers with weir(s). Experimental data by Govinda Rao and Muralidhar, which gave the discharge coefficient related to the flow pattern over the crest, were selected as base data. Equations for the upstream water level were obtained as the functions of the critical depth, h_c, with application ranges almost correspondent to those of the formula by Govinda Rao and Muralidhar. The obtained formula gave proper evaluation for the upstream water level of Bazin’s experimental data obtained for a wide range of hydraulic condition.