At the moment you cannot directly do this within MUSIC, but there is an easy way to workaround:
- When your simulation is run, right click on the node you are interested in (the rainwater tank, for example)
- Click on "Export (to MS Excel, ES ...)"
- Select the relevant timestep (probably daily) and the relevant data you want to export (in that case this is probably the outflow)
- Save the file wherever suits you (Tip: if you are using version 5, and you don't want to export a .txt file, just add .csv at the end of the file which is a format convenient to process the file in Excel).
NOTE: This functionality is in the work plan for the next version of MUSIC. Please let us know if you would like it sooner.