Does anybody have thoughts on a good, durable snowboard (about 2 feet square) to use when measuring snow for CoCoRaHS purposes? Last year, the first year reporting to CoCoRaHS, I used a 3/4" piece of untreated plywood that I had painted white. While it did its job, it warped and really isn't useable this year. Some have suggested using a 3/4" piece of plywood that has been pressure treated, then painted white. Others have suggested using a 3/4" piece of white solid PVC. The later approach sounds durable, but it is costly--$45 for the pvc board and about $20 to ship.