I have a 2 acre pond 8' deep with a 50 gal per minute artisian well supplying it,this will not keep up the seepage,wet spots below dike,loose 2'in the summer,it runs fine in the winter and spring.Thinking of trenching the middle of the dike and installing 12'sheets of plastic piling,for a containment wall,anybody try this?thanks Lee

That was suggested by the Portage County, Indiana NRCS for slowing down seepage in groundwater ponds dug in sandy conditions. They said to use the thickest plastic you can get, overlap any seams and seal them with something like roofing cement.

http://www.miniape.com/default.asp?pgid=128 plastic pilings do they work for water containment in ponds?

http://www.buyshorelineonline.com/slvibu1.html another product for dike installation,to stop seepage