Abstract

This chapter presents an approach to analysing combined sewer systems with dynamic sluice and radial gates for real-time flow control. New code was developed for radial gates and integrated into version 4 of the Extended Transport (EXTRAN) module of the Stormwater Management Model (SWMM4). The new program is called RGEXTRAN and is suitable for handling unsteady flow conditions occurring in real sewer systems with radial and regular sluice gates. The program also makes provision for dynamic control of the radial gates (or other gate types) based on flow conditions at remote locations in the sewer system. The radial gate code has been verified under a wide range of flow conditions, and found to produce good results for most conditions. The code can be used for dynamic or static sluice gates as well as radial gates by using the "constant discharge coefficient" option. RGEXTRAN is subject to the numerical stability concerns associated with the explicit scheme used in the EXTRAN program. This chapter covers the background and describes the verification of the new code.

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