Questions about leveling

[matt4x4]

Another method to get things perfectly level is a water level, you can't get much more accurate and they arer really easy to use, all you need is a good length of clear flexible tubing (Surgical tubinbg works nice), a large bucket or reservoir and a stake to fasten the tube to.

In your case, you will need about 30 feet of tubing, just make sure you keep pretty much the same amount of excess on stake, if you start to shorten your tube dramatically, it will push the water back to the bucket raising the level in the bucket. The extra length of tube can be snaked all over the area as long as it's between the bucket and stake it really doesn't matter how many feet run all over the place, it will always find it's own level unless you raise it above the water level.
If that just confused you, read the links below - they explain it well.

I believe you can buy then as well, but they're really cheap to make!

http://www.factsfacts.com/MyHomeRepair/WaterLevel.htm

http://www.taunton.com/finehomebuild...ges/hvt045.asp