Ken, if you don't have any surface runoff, how will the pond fill/refill after you fix this prob? (Not trying to be a SA, just curious) Also are you getting depressions or holes in the soil in the area that the water is coming from? (ground collapsing?) Lastly, if your successful in stopping the water from coming in. Will this create a swamp area beside your pond? (No other place for the water to go) Just curious about your situation, I've seen this kind of run-off before.