Is the water in the photos from runoff or ground water? You can get a topo view of the property using this tool.

http://www.acme.com/planimeter/

To to figure out the drainage area to the pond site, just point and click the high points on the topo and it will give you the acreage. Assuming the ground holds water and you have adequate room for a spillway the bowl in the picture looks like you could build a very nice size pond. Good luck keep us posted.



The road goes on forever and the party nevers end...............................................