At the base of a hill on my land I have a large flat area that water puddles in during rains. It' about 500 feet long and around 200 feet deep. I'm planning on taking out the trees and moving the dirt across the area to build a long, low dam.

I figure a 4ft dam and digging about 3 feet will give me 6 foot of water and a foot of freeboard.

I have a Case 1550 dozer to do this, so the work itself shouldn't be a problem.

My question is about the depth and width of the core trench. Is there a formula for this? My dozer blade is 12 feet wide. If I dig it that wide, am I creating more problems than I'm solving? I have a backhoe that I could use for this, but it's bucket is only 2ft wide. I was also thinking that I could lift the blade at the place I want the core trench, but don't think It would be the best solution.

Thanks,
Eddie