French drain, surface drain or grading correction?

The direct answer

First distinguish water running across the surface from water moving through saturated soil. Grading, swales and surface inlets manage surface runoff. A subsurface drain can collect infiltrating water in an appropriate design. A functioning discharge route that complies with local requirements is essential to either approach.

Start with where the water comes from

During a safe observation from the ground, map roof runoff, neighboring runoff, irrigation and hardscape. Note the low spots and how water reaches the wall. A downspout correction may address a concentrated source; it does not automatically solve poor grading across the whole side yard.

Existing drains should be checked for debris, damaged components and the location of their outlet before assuming a new system is needed. Avoid opening a backed-up line where pressurized water or contaminated waste may be released.

Compare the tools

Approach	What it is intended to do	Question to settle
Grading or swale	Direct surface water along a planned path.	Are elevations, access and the destination suitable?
Surface inlet or channel drain	Collect runoff from a low point or paved area.	Can the inlet and outlet handle the intended flow and be maintained?
Subsurface / French drain	Collect water within a designed soil-and-drain assembly.	Is subsurface water the issue, and is filtration and discharge appropriate?
Gutter/downspout work	Collect roof water and convey it away.	Where will concentrated discharge go?

The outlet is part of the repair

A pipe ending beside another foundation, on a neighboring property or at an unsuitable discharge point is not a complete drainage solution. Slope, access, local rules, soils and downstream conditions affect the design. Some sites need civil or geotechnical input.

Ask how the system will be cleaned and how its operation will be checked. Include accessible maintenance points in the plan instead of hiding every part under finished landscaping.

Do not start with a trench against the footing

Excavation can affect buried services, foundation support, retaining conditions and access. Utilities must be located and the excavation limits planned. A homeowner should not undermine a footing to create clearance or install an improvised drain.

AWC’s evaluation defines the observed problem and feasible repair boundary. Engineering, permits, concealed obstructions and any specialty investigation should be identified before construction is priced as a fixed scope.

Sources & further reading

Codes, product instructions and local requirements vary by assembly, permit and jurisdiction. Confirm the applicable requirements for the property.

Make the next conversation useful.

Start with a wide view, a close view, when the condition occurs, and what has already been tried. Keep customer names, access codes and unrelated private records out of photos.

Plan the evaluation →