The depth of what can be achieved is what amazes me as an engineer. I can build cisterns to hold water, underground reservoirs, a series of mechanisms to refill the water, and to move it to consumption points, through the use of labelled levers, but be sure to smooth the stone, lest you get dusty water. Have some drain away to create mist in a common area, everyone loves mist. And another floodgate to create a defensive section, should invaders breach the entrance.
This is but one such area that can be brought about through the mechanics of the game, not to mention swimming practise in 1/2 depth water (7 is fully deep) and more.
A truly wonderful game, and I'm honoured to have a crayon drawing from them, to have been like yourself a part of its history. Strike the earth!