I have a 30x80 pond that was overtaken by cattails so I had it dug to 4 feet to get rid of all weeds. Naturally I had drained the pond before getting a backhoe to dig it out. It refilled within a month and stayed filled for 2 months. It then slowly started to drain and now it's empty and has been for 2 months. Another pond 300 feet away is still full so I am curious as to why mine went dry. Any ideas or suggestions?