Clarification on "you must only use feature data from the same water year"

The announcement from Nov 17 says that we should only use feature data from the water year.

Does this also mean that, for example, the following feature would be prohibited:

Maximum yearly volume observed at a site (so far).

Let’s say I make a prediction for 2017. For the mentioned feature I take the volumes from all 2016 and before (except the test years) and calculate the maximum per site.

These types of features do not use data from test_monthly_naturalized_flow.csv but only from train.csv.

Are such features allowed or not?

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