Add reservoir example

[jackvreeken]

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[jackvreeken]

@maijvis Is there any code you have to that we can actually run this file? Currently it's just a bunch of definitions, including a function at the end. Is the point to just run this function?

[maijvis]

@jackvreeken The point was to just put the ZTM function out there, but you're right that it might be nicer to have something that actually runs if we call it an example. I wrote some lines to print the increase in salinity in the canal over a period of sixty days, can I add these to the currently uploaded file directly or should I reupload?

[jackvreeken]

I'd say to just add a commit on top, and then I can take a look at those changes. See #7 (comment) for some more detailed instructions on how to do this (but obviously the branch name is add-reservoir-example here, not flushing_effectiveness)