thanks for info on db100 &200. i was thinking of roto-tilling in the db200 prior to it getting too wet/slippery if that's possible. re: leaking under the dam--the two ft. of clay we lined the bottom of the pond with seemed to have helpd some but water still going out faster than coming in--pond has leveled out at about 1/2 full --at present no water going into pond other than rain at present---we were thinking of some way to tie the new pond bottom into the dam--i ran across this info on db100/200 and it sounded like a possibility --re: auger--i have post hole diggers but no auger--are you talking about going along back side of dam every 10ft or so and doing a test hole? doing so on front of dam would probably be too close to water in pond--in center of dam no auger would reach that far down so you must be talking backside of dam near ground level? thanks for info and replies