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Wet-yard diagnosis

Water Pooling in Yard After Rain: Find the Cause First

A puddle is the visible symptom. Before buying pipe or gravel, identify whether water is arriving as surface runoff, concentrated roof discharge, a low spot with no outlet, or persistent subsurface wetness.

Start with four observations, not a product name

Two yards can show the same puddle and need completely different next steps. The fastest useful screen is to note where water collects, how long it remains after rain, whether you can see water moving toward the spot, and whether a verified downhill outlet exists.

Pooling diagnostic

Choose the closest match. The result tells you what deserves measurement first; it is not an installation prescription.

If the puddle is next to the house

Treat water at a foundation as a higher-consequence problem than a cosmetic lawn puddle. First trace roof discharge and check the immediate surface grade away from the building. Extending or rerouting concentrated roof water can be more important than installing a drain farther out in the yard.

Use the downspout drainage planner to put roof volume and route fall in the same calculation. If the route is unclear, sketch the downspout, wet spot and candidate outlet in the yard planner.

If water visibly crosses the surface

Visible sheet flow or a repeatable shallow channel is evidence that elevation is driving the problem. Measure the high point, low point and candidate outlet before burying anything. Broad surface shaping or a shallow swale can be easier to inspect and maintain than a buried collection system when enough width and continuous fall are available.

If the water converges into one discrete hardscape low point, compare a surface inlet with a subsurface collector using the catch basin vs French drain screen.

If water appears in place and stays for a day

Longer persistence without obvious inflow can point toward compacted soil, slow infiltration, a local depression, shallow subsurface seepage or a seasonal groundwater condition. A drain cannot create a downhill endpoint that does not exist. If there is no gravity outlet, separate the questions of storage, soil acceptance and overflow.

For infiltration concepts, take repeated measurements at the proposed location with the soil infiltration field worksheet. A favorable shallow field observation still does not replace local groundwater, setback or permit requirements.

Measure the route before pricing the fix

  1. Mark the water source and the center of the wet area.
  2. Identify one or more possible outlets that are both lower and lawful.
  3. Measure horizontal route length and vertical fall; calculate end-to-end grade.
  4. Estimate runoff volume from the surfaces that actually feed the problem.
  5. Only then compare grading, swales, surface inlets, collection drains or infiltration storage.
Do not route water by assumption: verify property boundaries, discharge rights, buried utilities, septic/well constraints and where overflow goes in a larger storm. A route that works mathematically can still be unsafe or prohibited on site.

What not to infer from one storm

A single wet day does not tell you the seasonal high-water table or prove a drainage feature has failed. Antecedent soil moisture, frozen ground, debris, unusually intense rainfall and recent construction can all change what you observe. Repeated observations are more useful than a single photograph.

Related tools

Roof water reaches the wet areaEstimate roof runoff and route grade.
No gravity outletMeasure soil drain-down before sizing storage.
Several sources interactMap the whole property and compare routes on one sketch.