What are the downsides of a French drain?

A French drain is disruptive to install, it needs somewhere legal and downhill to send water, and it silts up if it was built against soil rather than in clean stone behind fabric. The fourth downside is the largest: it is often the wrong fix, bought because it was the fix that was offered.

The one that binds here

Clinton sits mainly on hydrologic group A soil and 74% of the mapped ground takes water in rather than shedding it. That makes the outfall the least of the downsides here and silting the worst. Free-draining ground is the ground where a drain laid against soil rather than in washed stone behind fabric fills with fines fastest, and it fails with nothing visible on the surface to say so. Ask what separates the stone from the soil.

The reasoning behind that

Disruption is unavoidable. An exterior run means a trench the length of the affected wall, and whatever is on top of it — lawn, patio, planting, driveway — comes up. Reinstatement is a real line on the quote and is sometimes larger than the drainage.

The outfall is the constraint people discover late. A drain does not consume water; it moves it. Somewhere downhill has to accept it, and where nothing does, the design becomes a dry well or a pump and the price changes accordingly.

Silting is the failure mode. A perforated pipe laid against soil fills with fines over a few seasons and stops working with nothing visible on the surface to say so. Washed stone and fabric are what prevent it.

And a drain solves ground water. It does nothing about a downspout at the wall, a slope running toward the house, or a leaking pipe. Those get checked first or the drain is treating a symptom.

More on this: French Drain and Sump Pump Repair in Clinton, UT.

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