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I’ve read all the “flood in basement” posts in the Forum for awhile and, having experienced many cellar floods myself, have put some time into a system that I think will address my problem BUT I want to hear what the Bstoner community thinks of it.

I have a 20×45 roof and a cellar with a main house sewer/drain line BELOW the cellar slab.

Simple system: 1) Install check valve on main house sewer/drain line and 2) install professional grade large capacity dry well under rear yard and route roof drains, downspouts and rear patio drain into it.

This does two things: 1) protects from inevitable backflow when the sewer overflows into my cellar (pops off the cap on the “U-pipe” in the sump hole and 2) when check valve is activated, the roof and rear yard drainage have someplace to go.

If I just installed the check valve, the sewer water would stay out but the roof water would still flood the cellar. This keep sewer water AND roof water out. Single family home, so no problems with tenants running dishwashers, washing machines showers, etc. when the check valve is activated.

What do you think of the systems design and what are your cost estimates?

Thanks in advice for all helpful/positive/non-flame comments.