Pond Boss Forums POND CONSTRUCTION Building a dam Dam on rock shelf seeps badly

Hico
We deal with this problem quite often up here on older ponds it is a tough problem to deal with if you take the damm down and rebuild you have a 70% chance of creating another leak in a different spot. Most of the time we drain the pond down remove soil from area of leak and pack with hard pan or clay we have been using 30 mesh bentonite mixed with sand wash from local quarries ,the two are mixed together and applied in a depth of 8" and packed then we cover with filter fabric and pack hardpan or clay it is best to coverdouble the area that you think is leaking to prevent water from walking through. Do not be fooled by pouring bentonite from a boat over leak it will not work.This type of project always requires proper planning and equipment.
Good Luck