So, Minecraft.

[kandrathe]

Another option if you're looking for efficient use of space is to put the water under the soil. The soil you are trying to till for farming just needs to be touching (or very close) to a water source so if you drop down a layer of water then put the farm on top of that you can do some interesting design things by hiding the water.

I tried this, and it did not work. The soil would not stay tilled.

In Single Player, I used a cool mod called Toggle Block. It allows you to better create automated farms. With the flip of a switch water would flow onto my farm washing the wheat and seeds to the collection point. With the press of a button, the Toggle Blocks would till and replant the ground.