Both the Shedd Aquarium and the Vancouver Aquarium have anaconda tanks that are mainly all water, while Oklahoma City (possibly having another pool in this exhibit) really failing to develop a half-decent exhibit for the world's largest snake.
Its always a shame when such a magnificent animal is made to look so pathetic. Though I hope there is another pool in the enclosure, to find a single small pool in a very large snake's enclosure is not uncommon.