Hydraulic Function of Manholes for Surcharged Flow in Urban Drainage Sewer Systems

Abstract

It has been pointed out that, for surcharged flow simulations in urban drainage sewer systems, manholes are very important runoff elements that govern the pressure-wave celerity of the surcharged flow. In the first half of this paper, a theoretical expression of the celerity, which evaluates a hydraulic function of manhles, is presented. In the later half, numerical simulations with representative urban sewer and simple underground channel systems are made using SWMM-EXTRAN, and the influence of a manhole storage on runoff characteristics of the surcharged flow are investigated.