Re: Sump Pump & Rain Water Issue
Pretty much all sump pump lines we deal with are 1-1/2 inch per pump. I would say that single 1-1/2 is not large enough and is causing restriction which reduces both pumps outputs. The 10-15 foot rise shouldn't be an issue and is not uncommon -- most sump pumps I've worked with include that rise in their specifications.
Either the existing line should be at least a 2 inch or two seperate 1-1/2 inch lines -- imo
"" an ounce of perception -- a pound of obscure "