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A rain garden is a shallow, planted depression that temporarily ponds water, filters it through soil and vegetation, and then infiltrates or conveys it. A dry well is a buried pit, chamber or gravel-filled void that receives runoff through a pipe, stores it underground and lets it seep into surrounding soil. The difference in treatment path, visibility and inspectability is more important than the labels.
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What each system does
Rain garden: surface storage and soil treatment
A rain garden is a bowl-shaped landscape feature placed where roof, driveway or other runoff can be directed safely. Water enters at the surface, spreads across the depression, and ponds temporarily—often to a designed depth—before moving through mulch and planted soil. Roots, soil particles and microbial activity can intercept sediment and some pollutants before water infiltrates.
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteSome designs use an underdrain or a liner when native soil infiltrates too slowly, when groundwater protection requires a different treatment train, or when infiltration is not appropriate. Those changes alter the hydraulic design and may trigger additional local requirements, so they should be specified for the site rather than copied from a generic detail.
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Dry well: underground storage and infiltration
A dry well places storage below grade. A buried pipe carries runoff into a gravel-filled pit, manufactured chamber or similar void. Water is held in the available void space and released through the sides and bottom into surrounding soil; some systems include an underdrain or other controlled outlet.
Because the runoff travels through a buried pipe into the structure, planting above the dry well does not by itself provide the same soil-and-plant treatment pathway. An Oregon State University Extension dry-well fact sheet describes a dry well as a last-resort low-impact measure when options such as rain gardens, planters or permeable pavement are impractical, and advises checking local design requirements.
Rain garden vs. dry well at a glance
| Decision point | Rain garden | Dry well |
|---|---|---|
| Visible footprint | Requires surface area for a planted depression and access around its inlet and overflow. | Mostly underground and can preserve open surface area, but covers and access points must remain serviceable. |
| How water is treated | Runoff moves through vegetation, mulch and soil before infiltration or controlled discharge. | Runoff enters a buried structure; surface planting does not treat water conveyed through the buried pipe. |
| Main site dependency | Suitable infiltration or a designed underdrain/filtration approach, manageable slope and safe groundwater and foundation separation. | A permeable soil layer at a practical excavation depth, with acceptable groundwater, bedrock, clogging and regulatory conditions. |
| What you can see | Inlet, ponding, plants, erosion and overflow are visible during inspections. | Most components are hidden, so inspection access and records of the buried layout matter. |
| Typical reason to consider it | You have landscape space and want a visible feature that also provides a soil-and-plant treatment path. | Surface space is constrained and testing confirms that deep infiltration is feasible and approved. |
| Automatic choice? | No. Poor soil, high groundwater, steep slopes or unsafe overflow can rule it out. | No. A shallow impermeable layer, groundwater, bedrock, clogging risk or permit issue can rule it out. |
Test the site before choosing a system
Map-based soil classifications are useful for screening, but they do not prove that the proposed installation spot will drain. Test the actual location and observe the surrounding grades. A rain garden should be designed to drain completely within 24 hours under City of Portland residential guidance; a dry well likewise needs enough surrounding permeability to empty without creating a persistent saturated zone.
Check infiltration
- Mark the proposed facility and the area that will drain to it.
- Dig or auger a test hole at the intended installation depth, not only at the surface.
- Follow the test method required by your municipality or designer and record the measured infiltration rate and soil layers.
- Repeat the test if soil varies across the site or if the proposed dry-well depth reaches a different layer.
- Use the result in sizing calculations; do not substitute a regional rule of thumb for a measured site condition.
For a dry well, specifically verify that the permeable layer is reachable without excavating into bedrock or a seasonal groundwater zone. If the only permeable layer is too deep, discontinuous or too close to groundwater, a dry well may not be appropriate.
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Map constraints and sensitive areas
- Locate the house foundation, basement walls, crawl spaces, retaining walls and neighboring foundations.
- Identify wells, septic components, underground utilities, property lines, pavement and low points where overflow could collect.
- Observe the slope. Portland residential guidance considers rain gardens unsuitable on slopes greater than 10 percent. Other jurisdictions may use different thresholds.
- Determine where excess water will go during a storm larger than the design event. The overflow route must lead away from structures and neighboring properties without eroding soil.
- Check seasonal groundwater and bedrock depth, not just conditions on a dry day.
Setbacks, permits and local rules
Keep infiltrated water away from foundations and other sensitive locations. Portland publishes different building setbacks depending on whether a basement is present and requires overflow to be routed away from structures and neighboring properties. Those distances are Portland criteria, not a universal setback table; your city, county, watershed authority or building department may require something else.
Before excavation, ask which departments review the work. Possible requirements include planning or zoning approval, building or plumbing permits, stormwater standards, utility locates and, in some jurisdictions, underground-injection controls. Oregon State University Extension notes that an Oregon dry-well design may fall under Underground Injection Control requirements depending on the arrangement. That Oregon rule should not be generalized to every state.
Request the current local detail or checklist and keep the approved plan, test results and as-built location. A future owner or contractor needs to know where buried chambers, cleanouts, underdrains and overflow pipes are located.
How to plan and build a rain garden
1. Define the contributing drainage area
Trace every roof downspout, patio, walk and driveway surface that will feed the garden. Confirm that the expected flow can reach the inlet without crossing a foundation or causing erosion. Disconnecting a downspout is not enough if the discharge simply creates a new problem uphill of a neighbor or basement.
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2. Select the elevation and overflow route
Place the depression on a stable, gently sloping part of the lot, outside required foundation setbacks. Set the inlet so water spreads rather than cuts a channel. Include a protected overflow point at an elevation below nearby doors and window wells, and route excess water to an approved swale, drain or other safe discharge location.
3. Size the footprint from evidence, not a fixed online formula
Use contributing area, design rainfall, measured infiltration, allowable ponding depth and the overflow arrangement. Oregon State University Extension gives a 6–15 percent footprint of draining impervious area in the Oregon design context described by its fact sheet; slower infiltration calls for a larger footprint. That range is not a nationwide homeowner standard.
A Massachusetts homeowner fact sheet gives a regional rule of thumb of one-eighth to one-third of the drainage area and a depth of 3–8 inches, while noting that soil and slope change the result. Treat those figures as Massachusetts guidance, not a universal design requirement. The same OSU material cites 10,000–15,000 square feet as a general maximum impervious drainage area for one infiltration facility in its design context; it is not a recommendation to size a residential garden that large.
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Excavate to the designed finished elevation, preserve the intended side slopes, and avoid compacting the infiltration surface with heavy equipment. Use the specified soil mix, mulch and erosion protection rather than assuming that native subsoil alone will perform as a filter. If the design includes an underdrain or liner, install it at the elevations shown on the approved plan and provide a lawful outlet.
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5. Plant for the actual moisture pattern
Choose locally appropriate species from municipal or extension plant lists. The bottom of the bowl may be wet after storms and dry between events; upper edges usually experience more drought. Select plants that tolerate those conditions and the local climate, then protect them while they establish. Avoid treating a generic plant list as proof that a species is suitable for your region.
6. Commission and observe the garden
After the first significant storms, check that water enters at the intended point, spreads without scour, ponds to the design depth and drains within the target period. Correct blocked inlets, exposed soil, settlement or an overflow route that directs water toward a building. Keep a simple sketch and photographs for future maintenance.
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1. Confirm that underground infiltration is justified
Use a dry well when a surface rain garden, planter or permeable-pavement approach is impractical—not merely because underground work is less visible. Confirm the permeable layer, groundwater separation, bedrock depth and excavation access before selecting the structure.
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2. Design the inflow and pretreatment
Size the roof leader or collection pipe for the contributing area and local design storm. Include a way to intercept leaves, sediment and roof debris before they reach the storage void; otherwise clogging can reduce the usable infiltration surface. The exact pretreatment device and access arrangement depend on local standards and the selected structure.
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3. Provide inspection and maintenance access
Locate cleanouts, covers or inspection ports where they can be reached without dismantling landscaping. Surface planting is acceptable only when it does not prevent maintenance access, according to the OSU dry-well guidance. Record the pipe route and structure location before backfilling.
4. Build to the approved detail
Use the specified chamber, stone gradation, geotextile, pipe slope, overflow and cover depth. Do not replace an engineered chamber with an improvised pit of unknown capacity. Keep construction sediment out of the completed structure and protect the receiving soil from compaction.
5. Test the completed route
Run a controlled amount of water through the inlet and verify that joints, cleanouts and the overflow behave as designed. Observe the next heavy rain if possible. Persistent surface water, backups or discharge at an unintended location indicates that the system needs investigation before more runoff is connected.
Maintenance and common failure symptoms
Rain garden checklist
- Inspect the inlet, spreader and overflow after heavy rain; remove leaves and sediment that block flow.
- Confirm that ponded water recedes within the designed period and that no channel is cutting through the garden.
- Replace dead plants, maintain mulch and repair eroded or settled areas.
- Keep turf, stored materials and invasive roots from blocking the inlet or overflow.
- Watch the garden during its establishment period. Portland says establishment takes about two years and that maintenance should then be minimal, not absent; periodic inspections remain necessary.
Dry-well checklist
- Keep covers, cleanouts and inspection ports visible and reachable.
- Remove sediment from pretreatment components before it reaches the storage chamber.
- Check for slow drainage, backups or water surfacing near the structure after storms.
- Do not plant or build over access points in a way that prevents servicing.
- Maintain records of the structure and pipe route. A universal inspection interval or service life is not established by the cited guidance, so follow the manufacturer, designer and local authority.
What symptoms mean
| Symptom | Likely investigation |
|---|---|
| Rain garden remains ponded beyond the design period | Check blocked inlets, compacted soil, sediment buildup, seasonal groundwater and whether the contributing area is larger than designed. |
| Water bypasses the garden and erodes the edge | Inspect the inlet elevation, flow spreader, stabilization and overflow route. |
| Dry-well cleanout backs up | Inspect the pipe, pretreatment and chamber for sediment or structural blockage; verify that the receiving soil still drains. |
| Water appears near a foundation or property line | Stop adding runoff, identify the flow path and obtain site-specific professional or authority guidance before modifying the system. |
Cost, space and construction trade-offs
No reliable universal price comparison establishes that one option is cheaper. Rain-garden cost changes with excavation, soil amendments, plants, edging, erosion control, pavement removal and downspout rerouting. Dry-well cost changes with excavation depth, shoring, imported stone or chambers, pipework, access covers, utility conflicts and disposal. Obtain estimates based on the measured site and approved design rather than using a national price average.
| Trade-off | Rain garden | Dry well |
|---|---|---|
| Land use | Consumes visible landscape area but can become an intentional planting feature. | Saves surface area but requires an underground excavation and permanent access points. |
| Construction disruption | Usually concentrated in surface excavation, soil preparation and planting. | Often involves deeper excavation, pipe installation and more difficult repair if buried components fail. |
| Water-quality pathway | Plants and soil are part of the designed flow path. | Requires separate pretreatment if sediment or pollutants must be removed before infiltration. |
| Inspection | Most performance indicators are visible. | Inspection depends on cleanouts, ports and accurate records. |
Which option fits common home situations?
Choose a rain garden when
- You have a suitable surface location outside required setbacks.
- The soil can infiltrate at the required rate, or an approved underdrain/filtration design is available.
- You want visible vegetation and a treatment path through soil.
- You can provide a safe overflow route and commit to establishment care and periodic inspection.
Consider a dry well when
- Surface space is constrained or a visible depression would conflict with how the yard is used.
- Testing confirms a permeable layer at a practical depth with acceptable groundwater and bedrock conditions.
- You can preserve access for inspection and maintenance.
- The local authority accepts the design and any applicable underground-injection or stormwater requirements are satisfied.
Use neither without redesign when
- Runoff would be directed toward a foundation, neighboring property, septic system or other sensitive location.
- The site has persistent high groundwater, shallow bedrock or very poor infiltration at the proposed depth.
- The slope is too steep for the chosen design or there is no safe overflow route.
- The contributing area and storm intensity exceed what the proposed facility can store and infiltrate.
A practical decision sequence
- List the surfaces that will contribute runoff and measure or estimate their area.
- Call for utility locating and check local planning, building, plumbing and stormwater rules.
- Test infiltration and document soil, groundwater and bedrock at the actual location.
- Map foundation and property-line setbacks and draw the overflow route.
- Compare a surface rain garden, a dry well and alternatives such as a planter, swale, permeable pavement or controlled discharge.
- Have the selected system sized for local rainfall, infiltration, ponding/storage and overflow conditions.
- Install to the approved detail, preserve access, and inspect performance after major storms.
Bottom line for homeowners
A rain garden is usually the stronger fit when surface space is available and the goal includes visible planting and treatment through soil. A dry well is a space-saving option only after testing proves that water can infiltrate into a suitable underground layer and the buried system can be inspected. In both cases, the decisive work happens before construction: measure the drainage area, test the actual soil, protect foundations and neighbors, plan overflow, and confirm local approval.
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