Advice on drainage project needed
We need to have some drainage work done at our house, and we've started having contractors out to give us estimates (though actually receiving the estimates is harder than I thought it would be). But from the things they've said, we have a bit of confusion about the right direction to go in.
During heavy rains there will be a lake created in our backyard, and also by the back side of the house (where water then enters the basement). During especially heavy rains, there is another area along the back of the house that will take in water.
We also know that we're going to need the yard regraded, as it slopes toward the house. There is also a driveway that goes all the way to an old garage/shed in the backyard. Half of that driveway is really poorly graded, aiming straight toward the house. (The back half of the driveway.) The front half of the driveway also slopes toward the house, but there's a sort of concrete bumper that seems to keep water out of the front half of the basement. But in an ideal world, that should probably go as well.
This is where some of the questions come in. The contractors agree that there should be some kind of drain put in the backyard where the lake is, and route that toward the driveway area where additional drainage will be put in.
1) Should the drainage along the driveway be right next to the house, or on the far end of the driveway? Currently there is a drainage pipe along the side of the house. The back half doesn't seem to work, but the front half does.
2) Should the flexible corrugated piping be used or rigid PVC piping?
3) For the drainage area in the backyard, we hope to add on a raised deck to the back of the house. Would it be okay to have the backyard drain be under the deck, or is that going to cause problems?
4) Should we just start off with the removal of the back half of the driveway, and hope that fixes the problem, or go on ahead and pay the bigger bucks and have the front half of the driveway redone and properly graded?
I'm attaching some drawings to try and illustrate what I'm talking about.