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22 votes
Accepted

French Drain: Why do I need 3" of rock bedding beneath the pipe?

If you put the pipe right on the fabric, you'll end up filtering the inflow through the 1/2" circles of fabric pressed up against the holes in the pipe, as opposed to filtering through all the ...
Ecnerwal's user avatar
  • 220k
17 votes

French Drain: Why do I need 3" of rock bedding beneath the pipe?

The water will still flow through the rocks with the pipe assuming your ditch slopes as well. If any sediment makes its way through or around the fabric, the extra 3" will help prevent the ...
rtaft's user avatar
  • 928
15 votes
Accepted

Does this water tunnel for rain look ok?

Without some sort of retention, that trench will likely cave in or mud up. Using the existing trench, you can improve it with a bit of effort: Dig the trench a bit deeper and lay some "big-o"...
P2000's user avatar
  • 16k
14 votes

Does this water tunnel for rain look ok?

Call me old fashioned but there is a downspout which you can extend to your destination.
MonkeyZeus's user avatar
  • 16.7k
11 votes

French Drain: Why do I need 3" of rock bedding beneath the pipe?

I'm doing similar right now,at my home. The problem is twofold. Silt and sediment will flow with the water and ultimately, may either clog the geotextile, or bypass it (through it if its a broad ...
Stilez's user avatar
  • 630
6 votes

French drain did not solve the problem

Putting a drain sump on the inside is like catching the blood from a cut on your arm into a cup. What you really need to be doing is taking a hard look at what caused the cut and remedy that problem ...
Michael Karas's user avatar
  • 65.2k
6 votes
Accepted

Should there be standing water at the bottom of a french drain?

Yes, that's a surface drain box (it may be connected to the pipes of a French drain, but it's not a part of a standard French drain) where the pipes are elevated from the floor so that you can remove ...
Ecnerwal's user avatar
  • 220k
5 votes

Are pre-drilled holes in pvc french drain pipe enough holes?

The holes in the pipe are enough; drilling more would weaken the pipe. The important thing with French drains is to have a good bed of gravel around the pipe for several inches. I like using a sock on ...
Ed Beal's user avatar
  • 103k
5 votes

How do I attach gutters to a french drain, does the perforated pipe need to run entire distance?

You are trying to combine two systems: 1) collection of ground water, and 2) collection of roof drainage. This is a bad idea...don’t do it. 1) Perforated pipe is used to COLLECT ground water. The ...
Lee Sam's user avatar
  • 23.3k
4 votes
Accepted

Downspout overwhelms French drain and water enters basement-- how to fix?

I ended up adding a new, non-perforated pipe parallel to the French drain to carry the downspout water away. I joined the two together far from the house to minimize chances of the downspout water ...
LShaver's user avatar
  • 1,306
4 votes

Does this water tunnel for rain look ok?

That would not last as trench for very long. The side walls will be eroded and fill up the trench. To slow the process of erosion, line it with mosquito net.
Traveler's user avatar
  • 17.9k
4 votes

Should Basement French Drain Have Water In It?

I expect your mother rarely looked into the covered sump in the past 20+ years. There's a pretty clear waterline in the pictures - the high part of it is 2-3 corrugations above the current waterlevel. ...
Ecnerwal's user avatar
  • 220k
3 votes
Accepted

Will a French Drain on the outside of a house keep water out of a crawlspace?

Cinder blocks are quite porous. To keep a basement or crawl space dry means keeping subterranean water (water table) and surface water off the foundation wall. Where I live we have a water table at ...
Lee Sam's user avatar
  • 23.3k
3 votes

Downspout overwhelms French drain and water enters basement-- how to fix?

Putting two separate drains in the same trench is more likely to work that what you propose which is putting more water into the french drain that it can handle.
Jasen's user avatar
  • 21.6k
3 votes

Downspout overwhelms French drain and water enters basement-- how to fix?

If life gives you lemons, make lemonade. http://www.gradybarrels.com/rain_barrel_photos.html Install rain barrels as a buffer. They can capture the heavy rain and so decrease the volume your french ...
Willk's user avatar
  • 6,613
3 votes

Downspout overwhelms French drain and water enters basement-- how to fix?

Since your French Drain appears to be 6 inches deep, consider stacking the solid pvc pipe for the downspouts on top of it. You definitely need to not add water from roof into French drain collection ...
Paul B's user avatar
  • 31
3 votes

How far out to install French drain so water can't pass underneath it and still get into house?

French drain below foundation level, problem solved. Anything less than that, problem potentially remains. And crip659 s also correct - you should fix the grade - my rule of thumb is that you want at ...
Ecnerwal's user avatar
  • 220k
3 votes

French Drain or solid PVC pipe

A solid pipe will do no good as a French drain. If draining water away from a foundation I use a perf pipe in a “sock” the sock prevents dirt migration but allows the water to drain.
Ed Beal's user avatar
  • 103k
3 votes

Will discolored concrete around French drain be a problem?

New and old concrete look different, period. That, of itself, is not a problem. You can try to artificially age the new concrete to be more similar-looking to the old concrete. The "different ...
Ecnerwal's user avatar
  • 220k
3 votes

need help identifying an outdoor drain

The box is a collection drain box. It should not be 1/2 filled with dirt. Dig the dirt out. You will find 1 or more "ports" where the water collected in the box should drain out. Where ...
RMDman's user avatar
  • 32.2k
3 votes

How do I prevent pest access to a French drain pipe going through a retaining wall?

I'd suggest cutting the tubing off at the face of the block, and using something like this rodent guard to keep critters from getting in. I use a couple of these on my landscape drains, and so far (...
Milwrdfan's user avatar
  • 4,912
3 votes

How does the water get into this drainage pipe under the basement floor?

usually a perforated pipe is used in this application, In a computer generated animation it really makes no difference which sort of pipe is used, because everything is fake.
Jasen's user avatar
  • 21.6k
2 votes

Preventing Clogging/Flooding at bottom of exterior basement steps

We had a similar issue: a walkout basement with one small drain that got covered with leaves and other plant debris when it rained hard. I searched quite a bit for a solution, but ended up coming up ...
Never Give Up's user avatar
2 votes
Accepted

Geotextile Filter for French drain woven or non-woven?

It has been 2 years now with a lot of snow in the winter and plenty of rain during spring and fall...I'm happy about my drainage system...it is dry in the crawlspace and the house is not moving ...
Lucy W.'s user avatar
  • 101
2 votes

Geotextile Filter for French drain woven or non-woven?

It depends on what your soil consists of. Actually, a nonwoven fabric is recommended for soils on the sandy side. However if your soil is a good part (>20%) clay, thats where things get tricky. The ...
Jon's user avatar
  • 21
2 votes
Accepted

Does a French drain need to terminate above ground?

Look at a typical "dry well" install - basically terminate the pipe into a blob of crushed rock, or an actual void/hole/tube punched full of holes, so the water can filter out. Just stopping the pipe ...
Ecnerwal's user avatar
  • 220k
2 votes

How do I install a french drain in a sunken concrete patio?

I don’t think that a French drain will benefit your situation unless the issue is surface water flowing over the top of the retaining wall. If that is the case, then it might help, but you would not ...
pdd's user avatar
  • 6,014
2 votes

Preventing Clogging/Flooding at bottom of exterior basement steps

Same sort of basement entry here in Seattle. Intermittent flooding and the hassle of sweeping wet leaves out of the stairwell for too many years. I love my current solution. A friend drilled support-...
user85650's user avatar
2 votes

French drain did not solve the problem

I think you are misunderstanding how interior french drains work. Exterior french drains help divert water away from the foundation and thereby reduce the amount of water entering the basement. ...
StrongBad's user avatar
  • 693
2 votes

How far from the foundation and how deep should a French drain be?

Location Since the water generally comes from outside the home's footprint, drain tile is usually installed along the footing (inside, outside, or both, depending on the situation). Whether you need ...
isherwood's user avatar
  • 140k

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