I would like to install an outside sump system in addition to my existing basement sump. This would entail a hole about 6'x6'x6' against the basement wall with a concrete block wall on two sides and a poured concrete stairway on third side (against basement wall). I would use an oversized sump with a submersible pump to better handle the wetter times like we are having now. I would still use the inside basement sump to handle the water softener discharge, etc. In the future I could see using this setup to install an outside basement door. Questions? Comments? Suggestions?