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When rainwater collects in a residential yard, first find where it enters and where it is supposed to go. Watch the area during or immediately after rain, trace flow from roof downspouts, paving and slopes, and check whether the ground falls toward the house. Keep water away from foundation walls, doors and crawlspaces before choosing a permanent feature such as regrading, a rain garden, a swale or an infiltration trench.
The right remedy depends on soil, site elevations, rainfall, nearby structures and a lawful discharge point. A quick fix that merely moves water to a sidewalk, a neighbour’s property or another foundation can create a larger problem. Use the sequence below to diagnose the source, protect the building and select a drainage approach that fits the property.
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1. Inspect the site while the problem is visible
Do not begin by filling the wet spot or burying a pipe. Observe the next rainfall, or inspect the ground while it is still wet, and record the path water takes. EPA maintenance guidance calls for checking landscape drainage, pooled rainwater, downspout leaders, intersections of adjoining pavements and new or changing foundation cracks.
Trace each source
- Roof runoff: Follow every gutter and downspout. Look for a disconnected leader, a joint that leaks against the wall, a blocked outlet or discharge that ends beside the foundation.
- Paved surfaces: Watch driveways, patios and paths. A settled edge or a poorly directed joint can send a sheet of water toward the house.
- Natural or altered slope: Identify whether the yard falls toward the building, toward a low corner or toward a neighbouring property.
- Low or settled ground: Compare the puddle with surrounding grade. Depressions can form after construction, tree removal, trench settlement or soil erosion.
- Building symptoms: Check doors, foundation walls, crawlspace vents and basement steps for dampness. Note whether cracks are new or changing, without trying to diagnose structural damage from appearance alone.
Take photographs from the same positions after several storms. Mark the approximate limits of ponding and note how long the area remains wet. This record helps distinguish a short-lived surface puddle from a recurring drainage route.
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2. Protect the foundation first
Surface water and roof runoff should be directed away from the building envelope. EPA moisture-control guidance describes positive drainage and gives a 5 percent grade away from the foundation as guidance, while noting that local requirements may be stricter. DOE building-science guidance likewise recommends suitable gutters and carrying downspout discharge to sloping final grade away from the home or to a separate underground catchment system.
These figures are design guidance, not a universal do-it-yourself specification. Existing walls, entrances, retaining structures, property lines and local code can limit what is possible. Do not scrape soil against siding, bridge a damp-proofing detail or create a route that concentrates water at a door threshold.
Use a temporary protection measure when necessary
If the next storm is imminent and water is reaching the wall, use a temporary, stable diversion that does not block an exit or create a trip hazard. Then install a durable solution after confirming the destination. Temporary measures are not a substitute for correcting the grade or discharge route.
3. Match the remedy to the source and destination
The options below address different causes. Select one only after identifying where overflow will go. EPA notes that stormwater planning should reflect local soil, precipitation and land use.
| Option | What it does | When it may fit | Key limitation |
|---|---|---|---|
| Downspout extension or solid leader | Moves roof runoff away from the wall | Water is concentrated at a downspout or roof edge | The outlet still needs a suitable, permitted destination; an extension does not correct every grading problem. |
| Regrading | Changes the direction of surface flow | Ground directs runoff toward the building or contains a correctable depression | Earthwork must not send water to neighbours or another structure; elevations and local requirements matter. |
| Rain barrel or cistern | Captures roof runoff for later reuse | Stored water can be used and a managed overflow route is available | Storage alone does not solve overflow or ponding that already exists. |
| Rain garden or bioretention area | Temporarily stores runoff, filters it and allows infiltration or underdrain flow | Site conditions permit a properly placed and designed planted basin | Soil and groundwater conditions matter; engineered bioretention is not identical to an informal low spot. |
| Swale or infiltration trench | Slows and conveys runoff, or adds storage and infiltration opportunity | A suitable route or receiving area exists and soil conditions support it | It must fit local drainage patterns, soil and discharge constraints. |
4. Correct a downspout discharge problem
A downspout extension or solid leader is often the most direct response when a roof outlet is the obvious source. Reconnect leaking sections, ensure the outlet is not blocked and lead the discharge to a stable area that remains away from the foundation. The route should not terminate where water can flow back along the wall, pool at a doorway or undermine a walkway.
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Check the complete route
- Inspect the gutter and leader during rain to confirm that water is actually reaching the outlet.
- Follow the proposed path across the ground or through a buried system, checking slopes, entrances and other structures.
- Identify the final receiving area before installation. An extension that ends in another low spot only relocates the puddle.
- Confirm municipal requirements and property boundaries before changing discharge or burying a line.
- After the next storm, inspect the wall, outlet and receiving area for backflow, erosion or renewed ponding.
DOE specifically calls for an overflow drainage system when roof water is captured in a rain barrel or cistern. The same principle applies to any storage or diversion device: plan for a full tank and an unusually wet storm, not only normal rainfall.
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5. Regrade ground that sends water toward the house
Regrading changes the surface so water follows a deliberate route rather than collecting beside the building. It can address a shallow depression, a settled construction trench or a yard whose general fall points toward the foundation.
Design checks before moving soil
- Establish existing elevations at the foundation, property lines, paving, doors and the proposed receiving area.
- Keep the positive fall away from the house consistent with the 5 percent EPA guidance unless a stricter local standard applies.
- Make sure the new route does not discharge onto a sidewalk, street, neighbouring parcel or another structure.
- Protect exposed foundation details and avoid raising finished soil against siding or vents.
- Allow for settlement; newly placed fill may change the grade again if it is not properly prepared.
Regrading is not simply adding a mound beside the wall. If the site has retaining walls, tight property boundaries, extensive paving or limited fall, a qualified local designer may need to establish a complete drainage profile.
6. Use a rain barrel or cistern only with managed overflow
Rain barrels and cisterns capture roof runoff for later use, reducing the immediate flow from a downspout. They are suitable only when the stored water can be used safely and the overflow has a planned route. A full container during a storm can otherwise recreate the original foundation problem.
Place the container on a stable base, keep its outlet from discharging toward the wall and connect overflow to a suitable receiving area. Check local rules for placement, screening, mosquito control and discharge. Storage does not fix runoff from driveways, saturated soil or a yard that already ponds independently of the roof.
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7. Build a rain garden or bioretention area deliberately
A rain garden is a depressed, planted area that receives runoff. EPA describes bioretention as allowing water to infiltrate or pass through an underdrain. During rain, temporary ponding can therefore be intentional. A random low spot that stays wet is not automatically a functioning rain garden.
Conditions that must be evaluated
- Infiltration: Soil must accept water at a suitable rate, or the design needs an underdrain and an approved outlet.
- Groundwater and foundations: The basin must be located so stored water does not increase moisture against the house or affect neighbouring structures.
- Overflow: Provide a safe route for storms that exceed the basin’s temporary storage.
- Runoff quality: Keep contaminated flows and sediment from overwhelming the planting area.
- Maintenance: Plan for mulch, vegetation, sediment removal and inspection of inlets and outlets.
Because infiltration and groundwater conditions vary, a bioretention feature should be treated as a site design rather than a universal garden recipe.
8. Consider swales and infiltration trenches
Vegetated swales
EPA’s stormwater guidance describes vegetative swales as channels that slow runoff and allow infiltration. A swale can guide water around a building or toward a rain garden while reducing the speed that causes erosion. It needs a continuous, stable path and an outlet that remains safe during heavy rain.
Infiltration trenches
An infiltration trench is a gravel-filled narrow ditch that intercepts runoff and provides storage and infiltration opportunity. Its performance depends on soil, groundwater, sediment loading and proximity to foundations or utilities. A trench that clogs or sits in saturated soil can lose its intended function, so inspection and a lawful overflow route are essential.
Neither feature should be installed solely because a puddle is inconvenient. Confirm the receiving area, underground services and local requirements before excavation.
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9. Avoid common fixes that make drainage worse
- Discharging to a neighbour: Moving water across a boundary can create property damage and legal disputes.
- Pointing a pipe at a sidewalk or street: This can create slippery surfaces, icing, erosion or an unapproved connection.
- Extending a downspout into a low spot: The puddle may become larger even though the wall looks drier temporarily.
- Relying on a sealed rain barrel: Without overflow planning, the container simply postpones discharge.
- Filling a depression without tracing flow: Water may be forced toward the foundation or another low area.
- Digging without locating utilities: Buried drainage work can damage services and create safety hazards.
- Assuming every wet area is structural: Ponding alone does not establish foundation failure; changing cracks or interior water require qualified assessment.
10. Know when to call for a site-specific assessment
Federal guidance provides general principles, but it cannot determine local code, property boundaries or the correct design for an unknown site. Seek a qualified local drainage, landscape or building professional when ponding persists after ordinary maintenance, water remains beside the foundation, a basement or crawlspace is receiving water, or the work requires substantial regrading or buried drainage.
Escalate promptly if foundation cracks are new or changing, walls are visibly shifting, floors are heaving, or water is entering electrical or mechanical areas. A professional can survey elevations, assess soil and groundwater, coordinate utility locating and design an outlet that complies with local requirements. Do not infer the cause or structural severity from photographs alone.
11. Inspect and maintain the completed solution
Drainage works only when inlets, channels, storage areas and outlets remain open. After major storms and at least seasonally, walk the route and record changes.
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- Clear leaves and sediment from gutters, downspouts, swale inlets and trench surfaces.
- Check extensions and solid leaders for separation, crushing or erosion at the outlet.
- Confirm that grading still falls away from the building and that settlement has not created a new depression.
- Inspect rain barrels, cisterns and overflow lines before wet weather.
- Remove accumulated sediment from rain gardens and keep vegetation healthy without blocking the inlet.
- Look at foundation walls, doors and crawlspace or basement areas for new moisture or changing cracks.
- Recheck the receiving area after an unusually intense storm; a system that works in ordinary rain may still need an emergency overflow route.
Keep the photographs and observations from the original diagnosis. Comparing them over time shows whether the intervention is reducing ponding or merely shifting it.
Quick Recap
12. A practical decision sequence
- Observe: Trace roof, pavement, slope and low-spot contributions during or just after rain.
- Protect: Keep surface and roof water away from walls, doors and crawlspaces using a temporary safe diversion if needed.
- Verify discharge: Choose a receiving area that is stable, permitted and not another property or structure.
- Match the intervention: Use a downspout leader for concentrated roof flow, regrading for a correctable surface slope, storage for reusable roof water, or a designed green-infrastructure feature where soil and space support it.
- Check constraints: Confirm local code, utility locations, soil, groundwater, property boundaries and overflow behavior.
- Escalate: Obtain a site-specific assessment for persistent, foundation-adjacent or excavation-heavy problems.
- Maintain: Inspect the system after storms and correct settlement, blockage or erosion before the next wet season.
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