Look at that topo map. I would start the pond in the lower center "gully", approximately at the 410' elevation mark, and cut a couple of ditches or swales going NE and SW to collect any runoff from the 500' elevations and lower in those directions.

Stop at your local NRCS office and get a soil map of the property, and also ask them if there is enough runoff in that area to supply a pond the size you want to build without punching in a well to help supplement it. Without having the correct soil to seal the pond, you will be looking at a liner to do that, and that my friend will cost some $$$ not only for the liner, but the labor to install it. That size liner will require seaming on-site.


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