What is a French Drain?

Posted: October 13, 2025 in french drain, What is a French Drain?
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What is a French Drain?

A French Drain consists of a Perforated Pipe with thousands of little holes in it similar to a Spaghetti Colander.   

The most advanced French Drainpipes have slits instead of holes.

Perforated French Drainpipe with Soc

Perforated French Drainpipe with Soc

In the case of the Spaghetti Colander, water is meant to flow out of the Colander away from the noodles.  With a Perforated French Drainpipe, the water needs to flow into the pipe from the surrounding area.

A French Drain is a perforated pipe placed in a drainage trench.  The Trench is dug across a problem drainage area where unwanted water stands or flows.

problem drainage area around new home construction In Edmond Oklahoma

Problem Drainage Area

Once the Drainage Trench is dug and the dirt is hauled away the French Drain can be installed.

Drainage Trench

Trench For French Drain

Next Steps for installation

A Trench liner should be installed in the trench and the perforated pipe with the Pipe filter placed on top.

Trench Liner and Pipe Filter Installation

Trench Liner and Pipe Filter installation

In the picture above, the Trench Liner is white, and the Pipe Filter is black.

If you want your French Drain to Last, Pay attention to the following Information!

The Trench Liner maintains the integrity of the Drainage Trench.  It keeps small particles from leaching into the underground sides of the French Drain.  A Trench Liner is essential for Longevity.

Without a Trench Liner French Drains will have performance issues as time goes by.

I installed my first French Drain in Norman Oklahoma in 1993.

The Pipe Filter is tightly wrapped around the Perforated French Drainpipe.  It keeps Debris and Soil from entering the pipe from the top through the gravel.

Dirt and Debris inside pipe

French Drainpipe with no trench liner or pipe filter

Once the Trench Liner and Pipe Filter are installed

Next, install the gravel or crushed limestone on top of the French Drainpipe, inside the Trench Liner.

Installing 4 Inch French Drain with trench Liner and pipe filter

The White Material is the Trench Liner. The black material is the Pipe Filter.

 

The Work above is not complete

A French Drain is an “Intake,” as part of a Drainage System.

A Transition Pipe and Exit must also be installed.

French Drain Near Driveway

French Drains Protect Driveways

This is a picture of a completed NON-CAPPED Version.

French Drains are Capped and Non-Capped.

 

To Learn More, go to DIY French Drain

Oklahoma Drainage and Sprinkler Repair — Installing – French DrainsSurface DrainsChannel DrainsSump Pumps.

Providing Expert Sprinkler Repair – Broken Sprinkler Pipes Sprinkler Head Adjustment – Sprinkler Valve Replacement

We provide Service for Folks in: Norman, Oklahoma City, Edmond, Moore, Blanchard, Mustang and Yukon.

Central and Western Oklahoma is our Service Area since 1993.  

                                                           (405) 203-9419

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