The most expensive water damage in NWA homes often comes from outside, not inside. A leaking pipe creates a defined problem with a defined fix. Persistent water intrusion from outside is harder to diagnose and harder to fix because the source can be anywhere on the property. French drains and exterior drainage systems address this problem by giving water somewhere intentional to go before it ends up under your house. Here is how the work is done in Northwest Arkansas and what it actually costs to protect your home from outside water.
Water in your basement or crawl space after rains? Call Bearnwa at 479-321-1313. Exterior drainage is part of our complete Drain & Sewer Services lineup.
What a French Drain Actually Is
The name is misleading. A French drain has nothing to do with France and is not really a drain in the household plumbing sense. The original design comes from a 19th century farmer named Henry French who developed underground gravel filled trenches to drain wet fields. The basic design has not changed much in 150 years.
A French drain is a perforated pipe laid in a gravel filled trench below grade. Water in the soil flows toward the trench because of the lower pressure, enters the gravel through the perforated pipe, and flows away from the protected area to a discharge point. Surface water can also flow into the trench through the gravel layer above the pipe.
The system works passively using gravity and soil pressure differences. No pumps required for typical installations. No moving parts to fail.
When You Need One in NWA
Wet basement after rains. Water seeping through basement walls or pooling on the basement floor indicates the foundation is being subjected to hydrostatic pressure from saturated soil. French drain along the foundation perimeter relieves the pressure.
Persistent yard flooding. Standing water that does not drain after rains. See yard flooding after heavy rain is a drainage problem to blame for the diagnostic.
Foundation moisture issues. Efflorescence (white mineral deposits) on basement walls, musty smells, mold growth in crawl spaces. All indicate moisture intrusion that drainage can address.
Hillside properties with water flow toward house. Common in Bella Vista, Eureka Springs, and parts of Fayetteville. Upslope drainage protects the foundation from runoff.
Wet patches in lawns that prevent normal use. Aesthetic and recreational issues. Lawns should be usable.
How Installation Works
The installation process for a typical 75 to 150 foot residential French drain.
Step one is locating utilities and assessing slope. The drain needs to flow downhill from inlet to discharge. Even modest slopes work if the system is designed correctly.
Step two is excavating the trench. Typical depth is 18 to 36 inches below grade. Width is 12 to 18 inches. The trench follows the path that needs protection.
Step three is laying landscape fabric in the trench. This prevents soil from migrating into the gravel and clogging the system long term.
Step four is placing the perforated pipe. Most NWA installations use 4 inch perforated PVC or corrugated drain pipe wrapped in additional filter sock.
Step five is backfilling with washed gravel. Typically pea gravel or 3/4 inch crushed stone. The gravel fills around and above the pipe to within a few inches of the surface.
Step six is topping with fabric and finishing surface material. Topsoil and sod for lawn areas. Decorative gravel for visible runs. River stone for accent installations.
Step seven is verifying flow to discharge point. Water has to actually leave the system to somewhere safe. Storm drains, daylight at slope bottoms, or dry wells.
What It Costs in NWA
| System type | Typical NWA cost |
|---|---|
| Short residential run (under 50 feet) | $2,500 to $5,500 |
| Standard foundation perimeter (75 to 150 feet) | $3,500 to $9,500 |
| Full property drainage system | $7,500 to $18,000+ |
| System with pump and discharge basin | Add $1,500 to $3,500 |
| Surface inlet additions | Add $200 to $500 each |
Common Mistakes That Cause Failures
French drains fail when they are installed poorly. The most common failure modes.
Insufficient slope. Without proper grade, water sits in the system rather than flowing through. Symptoms emerge within months.
Missing or inadequate filter fabric. Soil migrates into the gravel and clogs the system over years.
Discharge to nowhere useful. The system collects water effectively but dumps it where it causes new problems.
Pipe sized incorrectly for the water volume. Heavy rain events overwhelm undersized systems.
Bad gravel selection. Wrong size or unwashed gravel reduces effective drainage capacity.
Frequently Asked Questions
How long does a French drain last?
20 to 40 years with proper installation. Annual cleanout of any visible accumulated debris extends life. Major failures usually trace to original installation issues, not material failure.
Can I install one myself?
Possible for small surface drainage runs in flat yards. Foundation perimeter work and any installation requiring excavation near utilities should be professional.
Will a French drain fix basement waterproofing?
It addresses the hydrostatic pressure causing infiltration. Interior basement waterproofing addresses the water that gets through anyway. Both are sometimes needed.
Get the Water Going Where It Should
Persistent water intrusion is solvable with the right exterior drainage. Bearnwa designs and installs drainage solutions across NWA daily.
📞 Call 479-321-1313 or request a free quote. We serve Bentonville, Bella Vista, Rogers, Fayetteville, Springdale, Cave Springs, Centerton, Lowell, Gravette, Siloam Springs, and surrounding NWA towns.