Design and evaluation of control strategies in urban drainage systems in Kunming city

Abstract

A stepwise design approach for real time control strategy was proposed.

Three typical strategies (static, constant and equal-filling strategy) were studied.

The fourth urban drainage system in Kunming was used for case study.

Equal-filling strategy was found to be able to reduce CSO effectively.

Real time control (RTC) of urban drainage systems (UDSs) is an important measure to reduce combined sewer overflow (CSO) and urban flooding, helping achieve the aims of ‘Sponge City’. Application of RTC requires three main steps: strategy design, simulation-based evaluation and field test. But many of published RTC studies are system-specific, lacking discussions on how to design a strategy step by step. In addition, the existing studies are prone to use hydrologic model to evaluated strategies, but a more precise and dynamic insight into strategy performance is needed. To fill these knowledge gaps, based on a case UDS in Kunming city, a study on RTC strategy design and simulation-based evaluation is performed. Two off-line volume-based RTC strategy design principles, Maximize WWTP inflow and Make full use of space, are emphasized. Following these principles, a detailed design procedure is shown for the case UDS resulting in three RTC strategies: static, constant and equal filling. The proposed strategies are evaluated based on a hydrodynamic model- Storm Water Management Model (SWMM) - under four typical rainfall events characterized by different return periods (1-year or 0.5 year) and different spatial distributions (uniform or uneven). The equal filling strategy outperforms other two strategies and it can achieve 10% more CSO reduction and 5% more flooding reduction relative to the no-tank case.

Graphical abstract

Keywords

Urban drainage system / Real time control / Static strategy / Constant strategy / Equal filling strategy

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