I’m building a water feature as part of my RR. It will only be a log holding pond for the mill at Potlatch. I figure it will be about 4-5 inches deep, and perhaps 2 x 6 feet in an irregular rectangle.
The only problem is that the pond will be on raised roadbed, much like Richard’s. I plan to use 2 X 6 framing with 24 inch centers.
Will that be enough to carry the weight of the water, or should I go bigger, say 2 X 8?