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 tend to put the water under the fence corners and hide one water under the soil in the center of a 9x9 plot. Then, use a sticky piston to release some water for the harvest bringing all the wheat and seeds to the fence gate.