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Choosing a particular treatment node will set broadly appropriate default values for k, C*, and N (the number of CSTRs). The default values for k and C* are derived from the sedimentation equations of Fair & Geyer (1954), using a typical particle size distribution for Australian conditions (as described in Appendix G : - Selecting Appropriate k and C* Values). Any change in the particle size distribution will affect the values of k and C*, and so local data should be used where available.
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You are urged to calibrate the model with local or nearby data as much as possible. The default values have not been fitted to your catchment.
Note: Refer to Appendix G : - Selecting Appropriate k and C* Values for the USTM for advice on selecting appropriate parameter values for the USTM.
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