Exterior French Drains: Intercepting Water Before It Reaches Your Home
If water is pooling in a specific area of your yard, running toward your foundation, or collecting along a slope on your property, an exterior French drain is often the most direct way to catch it and redirect it — before it ever gets the chance to become a foundation, crawl space, or landscaping problem.
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How an Exterior French Drain Works
An exterior French drain is a trench, dug along the path where water naturally collects or where you need to intercept it, containing a perforated pipe bedded in gravel and wrapped in filter fabric. Water that would otherwise pool on the surface or seep into the soil toward your foundation enters the gravel and pipe instead, and is carried by gravity (or, where needed, a pump) to a discharge point well away from your home — a storm drain, a natural drainage area, or a designated outlet on your property.
Exterior vs. Interior French Drains
Exterior French drains stop water before it reaches your foundation wall at all, which makes them ideal for yard drainage, hillside runoff, and protecting a foundation proactively. Interior French drains, installed inside a crawl space or basement, catch water that has already made it past the foundation wall — useful for existing water intrusion problems where exterior excavation isn't practical. Many properties benefit from both: exterior drains to reduce the water reaching the foundation, and interior drains as a backstop for whatever still gets through.
Where Exterior French Drains Make the Biggest Difference
Yards with a slope that channels water toward the house
Low spots or depressions that collect standing water after rain
Properties where water visibly flows toward the foundation during storms
Landscaped areas being damaged by repeated water flow or erosion
Homes with a history of crawl space or basement water intrusion along a specific wall
Our Installation Process
We start with a free inspection, ideally observing water flow during or after rainfall, to map exactly where drainage is needed. We then trench along the planned path, install perforated pipe in washed gravel wrapped in filter fabric to resist clogging from clay silt, and route the system to an appropriate discharge point. We restore the surrounding landscaping once installation is complete.
Frequently Asked Questions
How deep does an exterior French drain need to be?
Depth depends on what the drain needs to intercept — surface water typically needs a shallower trench than groundwater or a foundation-adjacent drain. We determine the right depth during your inspection.
Will an exterior French drain work on a sloped or hillside property?
Yes — in fact, sloped properties are some of the most common and effective applications, since gravity can often carry collected water to a discharge point without needing a pump.
How long do exterior French drains last?
A properly installed system with quality filter fabric and adequate pipe sizing can function for decades with minimal maintenance, as the fabric prevents the clay silt common in our soil from clogging the pipe over time.
