snmofo..The uprights are placed in concrete,2x6's are bolted to that.This is at every 24 inches.Then 3/4 inch treated plywood is screwed to the 2x6's all around.This is the backing for the plastic.Plastic is placed over the plywood and out a few feet on the ground.You then procede to place sandbags on the plastic,keeping it tight to the ground.We also caulk the plywood where it meets the concrete slabe on the bottom.And that is it.Any leakage is taken care of with pumps.The pic is of mom's all erected but with no plastic yet.It is all done now,will post pics later.Water is getting higher.Went up 6" since yesturday.It may be getting closer to the big flood we had in 97.