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Flow in a vegetated swale is modelled in the USTM as uniform flow in a trapezoidal channel (although a triangular channel can be simulated by setting the base width to 0m).
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Inlet Properties
Low Flow Bypass
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The advanced properties section (opened using the ‘More’ button) of the swale properties dialogue box displays the parameters that describe the treatment processes in the swale as shown below.
For details on configuring CSTR cells, refer to Number of CSTR Cells. An infinite number of CSTRs would replicate the effects of plug flow through the swale. music defaults to 10 CSTR cells for swales as most swales are relatively long and thin, however, as the shape of the system can vary markedly dependent on design, the number of CSTR cells that is required to represent the hydraulic efficiency of the design is dependent on that shape.
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