Can anyone give me info on how to go about deepening my pond. I don't know how old the pond is, but right now the deepest area at full pool is 5 foot deep. I'd like to get it to at least 8 feet. How would I go about doing this without draining the pond? And, what might the cost factor be? The pond is approx. 1/2 acre in size. Any info would be greatly appreciated.