I have a run off pond that is down 5' and I am planning to clean out the shallow end and would like to have clay hauled in to reseal the bottom and sides.

When the pond was dug...clay had to be pushed from the deep end to the shallow end and I don't think it was done very well. I am thinking that I am loosing water from the shallow end on the sides. The water level drops and holds...so I am thinking the bottom is ok and that I just need to add clay on the sides.

My shallow end...when full...could hold 7' of water. How thick should I put in the clay so it can hold the weight/pressure?

Does anyone have an equation to figure out the number of yards needed? If someone can tell me how thick I need the clay...I know the number of square feet that I would like to cover.

Thanks,
Wes