Fundamental Studies on the Runoff by Characteristics

Abstract

In treating the hydraulic analysis of surface runoff phenomena, the author's basic idea is expressed as follows: the surface runoff mechanism of rain water in a mountainous district consists of the combination of overland flow and flow in open channels with lateral inflow. Consequently, the unsteady flows with lateral inflow must be solved for various conditions, individually. In this paper, an approximate method for calculation of unsteady flow in open channels with lateral inflow, using the characteristic curve, is presented. Hydrographs resulting from the abrupt increase and decrease of rate of lateral inflow are obtained by this approach, and moreover the calculated hydrographs are compared with the experimental results.