My calculations put that size of pond liner 45 mil, at a weight of about 15000 pounds. And I would be looking at about a price in $20,000 range. I would definitely look into using bentonite clay for a project like this. I would be very surprised if you could find a one piece liner for this and you will have to join them.
You might want to browse Firestone's website to check out their liners
http://www.firestonebpe.com/lining/a...rrigation/_en/
PS: 20 mil is a lot thinner than 45 mil. (If I did my conversion right there are 245 Mil in 1 inch)
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Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways - Beer in one hand - Nacho's in the other - body thoroughly used up, totally worn out and screaming : Woo Hoo, what a ride!
