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MUSIC uses the Universal Stormwater Treatment Model (USTM) to calculate the treatment processes that take place in most of the treatment devices - wetlands, vegetated swales, ponds, tanks and sediment basins, as well as in the ponding (extended detention) zones of infiltration, bioretention and media filtration systems. For more information regarding the details of the USTM, you should read The Universal Stormwater Treatment Model.

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When the Auto Run mode is turned on, clicking the Finish button will automatically run the simulation model if the treatment device is connected to a source node. A progress bar will be displayed while the simulation is running.

 

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Number of CSTR Cells
Number of CSTR Cells
Number of CSTR Cells

The USTM models the treatment of each of the contaminants using a series of continuously stirred tank reactors (CSTR), each with a first order kinetic model to describe the exponential decay of the contaminant. To select the most appropriate value, click on the button next to the CSTR Cells entry box. A new dialog box is then opened allowing you to click on the radio button that is next to the shape which most appropriately describes the shape of the swale as shown below.

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