French drains in Hattiesburg
A French drain gives water in the soil a faster way out than the dirt around it. Here's when one makes sense in a Pine Belt yard.
A French drain is a trench wrapped in filter fabric, filled with washed stone, with a perforated pipe near the bottom. Water in the surrounding soil seeps into the stone because it moves through gravel far more easily than through dirt. From there it enters the pipe and flows downhill to an outlet. It's the right tool when the ground itself stays saturated, not just when water skates across the surface.
When does a French drain make sense?
- A low part of the lawn that stays spongy for days after rain
- Water seeping out of a slope above the house or a walk-out wall
- Wet soil along the uphill side of a slab or crawl space wall
- A soggy area that came back even after the surface was regraded
How do Hattiesburg soils affect the design?
On the ridges around Hattiesburg, soils like the McLaurin series have a sandy surface over a subsoil that gets firmer and more loamy with depth. Water soaks in fast, slows at the denser layer and creeps sideways downhill. A drain set across the slope, usually called a curtain drain, catches that flow before it reaches the house. The trench has to be deep enough to cut into the wet layer, the fabric has to keep fine sand out of the stone, and the pipe needs steady fall from one end to the other.
What about flat lots on the river terraces?
Closer to the Leaf and Bouie rivers, many lots are nearly level. Water may not run off, but there may also be very little fall to anywhere lower. A French drain only works if it has a lower outlet, so on flat ground the contractor might pair a short drain with regrading, a swale or a pop-up emitter rather than a long buried run.
Where will the pipe come out?
Ask this before anything else. Reasonable outlets include a street curb or ditch where the city or county allows it, an existing swale, or an emitter in a part of your yard that drains well. A drain that dead-ends in a hole or empties onto a neighbor's lot is not a finished job.
What should the written quote cover?
- Route, length and depth of the trench
- Pipe type and size, fabric and stone
- The outlet location and how it's kept clear
- Who places the Mississippi 811 request and how sod and beds get restored
No two yards are priced the same. A contractor has to walk the lot, check the fall to an outlet and see what the soil is doing before giving a number, so we don't list prices here. Any figure offered over the phone without a visit is a rough guess at best.
Where we connect you with help
Common questions
How deep does a French drain go?
Deep enough to reach the layer where water is collecting, which varies from yard to yard. The contractor should explain the depth in the written plan.
What's a curtain drain?
A French drain placed across a slope, uphill of the area you want dry, so it intercepts water before it gets there.
Related services
- Downspout drain lines
- Regrading and swales
- Catch basins and channel drains
- Sump pumps and crawl space water
More background: Pine Belt drainage guide.
Back yard still squishy two days after the rain quit?
Call and a drainage contractor who works the Pine Belt will come see where the water collects and where it can safely go.