TECHNICAL THEORY AND VERIFICATION OF FLOWING WATER DIVERSION IN NEW RAINWATER DISCHARGE CHAMBER

Abstract

 The combined sewer improvement works addressed in sewer advanced areas have had a task in the interception accuracy of sewerage flowing into an intercepting pipe, and its countermeasures have also been pointed out in terms of a low improvement effect and complicated maintenance and management. With regard to the flowing water diversion function, a hydraulic phenomenon of an overflow weir and an orifice is organically combined, and in the conventional technology, flow quantity is directly controlled by overflow in a single tank, but this study proposed an indirect control with several tanks to regulate the water level in the diversion chamber. This study was to verify technical theories of the conventional technology and the new technology with regard to the interception accuracy of sewerage flowing into the intercepting pipe, and scrutinized data of a numerical analysis of a diversion phenomenon and a hydraulic model experiment to judge the validity from a management practice point of view. Results of this study showed that an excessive interception error of sewerage by the conventional technology, 45% become to 3% or less by the new technology with three regulating tanks in the diversion chamber.