
Proper way to bury sump pump discharge line? | DIY …
2014/6/16· 4 inch is fine---You do not want to hard pipe the sump discharge into the underground pipe---if the pipe ever clogs or freezes the pump will not work or worse--blow a fitting inside the house Create a ''free fall'' drain--the smaller discharge pipe dumps into the larger underground pipe much like a faucet dumping into a sink---if the pipe clogs--the sump water will overflow onto the ground ---