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  1. G'day all, I have used multiple "Read Materials File" calls in a model I'm working on, with scenarios for roughness increased and decreased by 20% (sensitivity tests). From looking at the uvpt check output my understanding is that, if a material code is used more than once, the first Manning's n value is used, not the last. Can you confirm this understanding is correct? If so it might be worth adding a comment to future releases of the manual. Based on other commands that can be used multiple times I expected codes roughness values to be overwritten by later calls to "Read Materials File". Below is an extract from my TCF for reference. This extract has the desired effect but I first expected the last line to need to be at the top: If Scenario == Sens(2A_MnInc20pcent) Read Materials File == ..\model\materials.tmf | 1.2 Else If Scenario == Sens(2B_MnDec20pcent) Read Materials File == ..\model\materials.tmf | 0.8 End If ! Baseline roughness, this will not be applied if Sens(2A_MnInc20pcent) or Sens(2B_MnDec20pcent) applied first. Read Materials File == ..\model\materials.tmf Having checked the uvpt check output, if I run with scenario Sens(2A_MnInc20pcent) specified I have roughness increased by 20%; with Sens(2A_MnInc20pcent) I have decreased roughness 20%, with neither I have my baseline roughness. Thanks for reading, Matty
  2. All, We are running a rainfall model using TuFLOW, which uses variable Manning's for the 2D domain to help maintain model stability. However, the thought occurred as to why it is not more common to incorporate variable Manning's into all models? Is this something that people have given much thought to, or is a constant Mannings roughness value considered to be appropriate? Any thoughts would be most welcome. Regards, L
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