Drain tile design???
Drain tile design???
(OP)
I've been asked to determine a quantity of drain tiles needed for the construction of a large concrete pad. The project consists of the construction of a large concrete pad approximately 340' x 175' for storage.
Now, I'm not too familiar with drain tiles and I've never had to do any design involving drain tiles. Fortunately, I'm just coming up with a quantity for the proposal and I'm not doing any design.
Anyway, my understanding of drain tiles is that they are basically just perforated pipe, correct? I assume that they're basically laid out around the perimeter of a foundation at the same height as the bottom of the slab (or footings) and sloped to pick up water and move it away from the building. Is that the basic idea? Don't worry, someone with some experience will be doing the design, I'm just coming up with a rough estimate of quantities for the proposal.
Now, with a slab that large (340' x 175') how do I determine the size of drain tile that I will need. The research I've done shows standard is about 4" dia., but that's for residential applications I believe. Would I want to bump this up a few sizes, say 12" or so? Is there a quick, simple way to determine what size is needed without knowing any info on the groundwater at the site? We have very little info.
Lastly, and most importantly, will drain tiles around the perimeter be enough for a slab this large? Would I want to make a network of drain tiles under the slab to ensure better drainage? This slab is going to be elevated above the current grade at the project location by at least a few feet, so I don't foresee high groundwater being too much of an issue. However, if drain tiles are needed under the slab, is there a quick way to estimate an approximate quantity needed without any available information other than size of slab.
Any help on this would be much appreciated. I've been asked to help out someone in another discipline and the guy I know who has experience with drain tiles is gone through next week.
Peace,
Stoddardvilla
Now, I'm not too familiar with drain tiles and I've never had to do any design involving drain tiles. Fortunately, I'm just coming up with a quantity for the proposal and I'm not doing any design.
Anyway, my understanding of drain tiles is that they are basically just perforated pipe, correct? I assume that they're basically laid out around the perimeter of a foundation at the same height as the bottom of the slab (or footings) and sloped to pick up water and move it away from the building. Is that the basic idea? Don't worry, someone with some experience will be doing the design, I'm just coming up with a rough estimate of quantities for the proposal.
Now, with a slab that large (340' x 175') how do I determine the size of drain tile that I will need. The research I've done shows standard is about 4" dia., but that's for residential applications I believe. Would I want to bump this up a few sizes, say 12" or so? Is there a quick, simple way to determine what size is needed without knowing any info on the groundwater at the site? We have very little info.
Lastly, and most importantly, will drain tiles around the perimeter be enough for a slab this large? Would I want to make a network of drain tiles under the slab to ensure better drainage? This slab is going to be elevated above the current grade at the project location by at least a few feet, so I don't foresee high groundwater being too much of an issue. However, if drain tiles are needed under the slab, is there a quick way to estimate an approximate quantity needed without any available information other than size of slab.
Any help on this would be much appreciated. I've been asked to help out someone in another discipline and the guy I know who has experience with drain tiles is gone through next week.
Peace,
Stoddardvilla





RE: Drain tile design???
RE: Drain tile design???
For proposal purposes, I'm going to assume that we'll be running 8" perforated pipe at 25' intervals across the entire slab. They will daylight on the hill nearby. I assume they'll be about 2' below the slab, but that information isn't really necessary now because this is just for gathering quantities for a proposal.
If it were me, I don't think I'd even bother with drain tiles, but they want them, so they're going to get them.
Peace,
Stoddardvilla
RE: Drain tile design???
RE: Drain tile design???
Just figure the capacity of that pipe at the slope you will put it in at. Now, where will you get all the water to fill it? From your description, you will only have infiltration through the backfill around the building (possible pipe breaks, etc. excluded).
RE: Drain tile design???
Dik
RE: Drain tile design???
Thanks,
Stoddardvilla
RE: Drain tile design???
Dik
RE: Drain tile design???
Peace,
Stoddardvilla