Since the 80s, regulatory agencies in the US and around the world have slowly been realizing that anti-seep collars are at best marginally effective and at worst can contribute to dam failure. NRCS guidelines require a filter drain diaphram rather than anti-seep collars on all but "low hazard ponds" (defined in NRCS code 378).

To over simplify it, a filter drain diaphram is a 2' wide section of the drain pipe that is surounded by sand.

Has anyone here had a dam built using filter drain diaphrams on dam penetrations rather than anti-seep collars?

Thanks

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