Drain tile drop per foot ?

[block]

I will be installing a perforated drain tile around the perimeter of the house foundation.
My question is what is the minimum/maximum drop in inches per foot for having good drainage ?
Thanks

[Sparks]

I don't have the exact specs but I think it's between 1/8" to 1/4" per foot. A quarter bubble or so on your level.

[block]

Thanks Sparks.
That sounds good to me. I will probably be closer to the 1/8" per foot. But I guess thats better than no drop at all...right ?
I just want to get as much water out to daylight as soon as possible.
Thanks again.

[Sparks]

Yeah, it doesn't take much slope for water to flow. Of course too much slope is not a good thing either.

[block]

Thanks. I agree on that. My biggest problem is I worry too much. I just want to make sure its done right.
Thanks again.