Comparing Models for Stormwater Structures

Singapore, August 6, 2018

What’s the best way to model green stormwater structures? A team of Innovyze experts based in Australia and the UK have published a poster showing the differences between two approaches that combine surface and groundwater modelling.

Green stormwater infrastructure is known by different names around the world: Water Sensitive Urban Design (WSUD) in Australia and the US, Sustainable Drainage Systems (SuDS) in the UK, and Low Impact Developments (LIDs) in several other countries. The location and design of these structures varies a great deal, so they’re relatively complex to model.

Sudesh Mudaliar, Vice-President Asia for Innovyze, presented the work of our team of flow engine developers at Singapore International Water Week in July 2018. The team compared two contrasting representations of LIDs: the flow routing engine currently used in XPDRAINAGE, developed by Innovyze, and a modified version of the open-source SWMM5 flow engine. These use very different approaches, but they share a detailed description of LID structures.

(Sudesh Mudaliar Vice President of Asia presented the ‘Comparison of two approaches for the modelling of Stormwater infrastructures’ poster at SIWW)
(Sudesh Mudaliar Vice President of Asia presented the ‘Comparison of two approaches for the modelling of Stormwater infrastructures’ poster at SIWW)

The team ran simulations for a swale, a bioretention structure, and porous paving. They said in the poster: “Despite the differences in the representation of processes in the two types of flow engines considered here, there are some notable similarities in the results, in many cases due to the influence of the flow controls.” While XPDRAINAGE had some limitations in the hydraulic network, with backwater and reverse flow, SWMM5’s main issue was the time water would take to infiltrate sub-surface layers. The poster goes into more detail and also discusses some ways to compensate for the SWMM limitations.

The Innovyze team is planning further work, including comparing the engines’ results with experimental data on LIDs.

The poster was published at Singapore International Water Week, and is available here.

To find out more about software that our team develops to solve the challenges of managing water resources join the Innovyze community at www.innovyze.com or contact the below.

Alana Deghelli
Marketing Manager
Phone: +61 7 5506 5700
alana.deghelli@innovyze.com

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