I fixed somethings, and the water and center building are waypointed, just give them some time I guess.
I also changed that they will not exit from the water, only the ladders because they have problems exiting water to land on this map.
Also I did not use any goal waypoint in this map. I thought of making the center building a goal but I chose only to use team specifics so maybe they will roam more freely instead of focusing on center building because this is fy_ map.
http://www.filefront.com/15088583/fy_waterarena.zip