Journal of Natural Disaster Science

RUNOFF SIMULATION OF SEWER PIPE SYSTEMS WITH LATERAL PIPES

Masahiro WATANABE
Associate Professor, Department of Civil Engineering, Ehime University, Matsuyama
Takeharu ETOH
Professor, Department of Civil Engineering, Kinki University, Higashi-Osaka
and
Akira MUROTA
Professor, Department of Civil Engineering, Osaka Industrial University, Daito

(Received 8 May 1991 and in revised form 3 October 1991)

Abstract

In urban sewer pipe systems, many small lateral pipes from houses and roads are connected to storm sewer pipes. Pressurized water, air, or both in the surcharged flows in the pipes rises up inside the laterals, markedly relaxing the pressure. This relaxation effect is incorporated in the proposed LATERAL model, which makes the numerical simulation more realistic. Another model called the SLOT model for practical calculation is then presented by introducing a thin, continuous slot on a pipe instead of laterals. The expressions that relate the major parameters of the LATERAL model to those of the SLOT model are derived.

Key words

urban stormwater runoff, sewer pipe system, open-channel and surcharged flows, lateral pipe, pressure-relaxation effect