External French drain going into internal sump?

[Gnfanatic]

Bad idea?? Hello everyone. Building an extention on my house with a full basement. Water table is 10.3 ' so exterior French channel and water proofing walls is absolutely a must. I got the walls ready to go and I have 4in green pipe coming with 2 rows of holes on the bottom. This is the dilemma..... if I have basin outside I need it to be at least 12' long to go deep enough because the pipe is 8' deep. Where do you buy such a thing? OR run a 4in pipe under my footing into an interior basin. Much easier and cheaper but would you go this route??

 

[John Gayewski]

You can bury a 12" or 14" pipe upright and drop a pump down into it.

The main question is where are you going to pump the water?

 

[Sponsor]

 

[Gnfanatic]

Hi John. Out to the street like everyone else on the block. Good thing is that it is a rare occurrence, just want to do it right the first time

 

[John Gayewski]

I have seen a design where the perimeter drains all flow to one spot outside of the building. From that spot there is a large pipe buried up on end (like a manhole but a man won't fit). The pump is then lowered down into the hole with a small chain and piped to a 2" pipe that is pretty shallow, which then gravity feeds to another tile away from the building. I liked that idea.

I've also ran them to a pit in the house, but that's not my favorite.

 

[John Gayewski]

Very rough drawing