The 2017 Hydro Dynamics Challenge details are now posted on the FIRST LEGO League website.  We will not duplicate the resources but instead always recommend that you look at the source materials.

http://www.firstlegoleague.org/challenge#block-block-19

Also,  Project and Game Updates come throughout the season – as of August 29th morning, there is 1 Game Update and 3 Project Updates!

https://firstinspiresst01.blob.core.windows.net/fll/hydro-dynamics-challenge-updates.pdf