FYI: Where I'll be...

[E-Revonut]

Good luck Brian! My Mom and step dad have had continuous flooding in their basement, mostly through the sewer line. They wound up putting a one way valve in, similar to a check valve, but it had a special name. When there are water issues now there basement is dry but if that valve shuts they can only get about two flushes before the drains stop working. I would rather have to rent a portapotty and keep the basement dry myself so I think thats a small trade off. They had their washer, dryer, furnace, hot water heater, and freezer replaced twice because of flooding. Each time they raised things up higher. Their basement is only about 6'4" and they have their furnace and hot water heater almost 3 feet off the floor so if you have a deeper basement 4' shouldn't be a big deal. There are shorter furnaces that you can get, they're just fatter, I'm sure that you can get similar hot water tanks.

Gave a few cookies to your calculator, I've used it enough, hope it helps