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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