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

Water Supply Forecast Rodeo
1

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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