Landscape
Backyard drainage solutions for Arizona yards.
Valley drainage failures are rarely about rainfall totals. They are about short, intense monsoon bursts landing on hard surfaces and tight soil with nowhere to go. This guide shows how to diagnose your yard, which system solves which symptom, and why grading comes before any product.
- AZ ROC 211530 · 347738 · 341002 · 340966
- Arizona-built since 2005
- President, Southwest Hardscapes Association
01
Diagnose before you dig
- Watch the yard during a storm, or run a hose test at the suspected high point, and photograph where water pools.
- Mark the low points and confirm whether they sit higher or lower than any available outlet.
- Check the perimeter of the house for negative grade — this is the highest-priority fix.
- Note roof discharge points, scuppers, and where neighbor runoff enters your property.
- If any part of the plan relies on infiltration, get a percolation test before designing it.
02
Symptom-to-fix diagnosis
Match what your yard is doing to the underlying cause. The fix column is the correction that addresses the cause, not the one that hides the symptom.
| Symptom | Likely cause | What actually fixes it |
|---|---|---|
| Water stands on the patio for hours after a storm | Slab or paver field is flat or pitched back toward the house. | Re-establish fall away from the structure, or intercept with a channel drain at the low edge and pipe it to daylight. |
| Puddles along the house foundation | Negative grade at the perimeter, often from years of settled soil or added rock. | Rebuild positive grade at the perimeter so surface water moves away from the wall before any drain is considered. |
| Yard drains slowly, soil stays soggy | Compacted clay or caliche layer holding water in the root zone. | Percolation test first. Caliche often has to be penetrated or the water routed above it rather than into it. |
| Monsoon flow crosses the yard and dumps into the pool | Uncontrolled sheet flow with no interception path. | Swale or channel drain upstream of the pool deck, sized to the contributing area, discharged where it will not harm a neighbor. |
| Water pours off the roof into one spot | Downspouts or scuppers discharging directly onto soil or rock. | Capture at the discharge point and pipe it away, or build a splash and swale path that carries it to the intended outlet. |
| Turf smells or stays wet after rain | Base drains poorly or the perimeter has no outlet. | Verify the turf base and edge detail — a permeable base sitting in a bathtub still holds water. |
| Retaining wall weeping or bulging | Hydrostatic pressure behind the wall with no drainage behind it. | Drain rock, filter fabric, and a functioning drain line behind the wall — this is structural, not cosmetic. |
Diagnosis guidance only. The correct fix for your yard depends on measured elevations, soil conditions, roof and hardscape area, available outlets, and any drainage requirements set by your municipality or HOA.
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03
The tools, and when each one is right
- Grading and swales: the primary tool. Cheapest, most durable, and required before anything else works.
- Channel/trench drain: intercepts sheet flow across a patio, driveway, or pool deck edge.
- Catch basin: collects at a low point and settles debris ahead of the pipe run.
- Area drain: small grated inlet for planters and isolated low spots.
- Piped outlet to daylight: what makes the whole system function — no outlet, no drainage.
- Dry well or infiltration: only where a percolation test and the jurisdiction support it.
- Permeable paver system: can store and infiltrate volume when the subgrade allows.
04
Arizona-specific realities
- Caliche can stop infiltration cold — test, do not assume.
- Monsoon flow arrives fast; systems sized for gentle rain overflow in a real storm.
- Rock fields move in high flow and can clog inlets; grate selection and maintenance matter.
- Discharge cannot be routed onto a neighbor's property; the legal outlet drives the design.
- City and HOA requirements differ across the Valley and must be confirmed before construction.
05
Maintenance that keeps it working
- Clear grates and catch basins before monsoon season and after major storms.
- Flush pipe runs periodically; fine sediment is the usual failure mode in the desert.
- Keep rock and granite from migrating over inlets.
- Re-check perimeter grade after any landscape change that adds material near the house.
06
How AE handles drainage
AE looks at where water comes from, where it currently goes, and where it is legally allowed to go before proposing any product. Grade correction comes first, collection and piping second, and infiltration only where soil testing supports it. The scope names the components, the outlet, and the responsibilities in writing. Final requirements depend on measured site conditions, soil testing, and your jurisdiction's rules.
FAQ
Common questions.
Because Arizona rain arrives fast. Monsoon storms drop a large volume in a short window onto soil that absorbs slowly, plus most Valley yards are largely hard surface and rock. The issue is almost never total rainfall — it is that there is nowhere for a short, intense burst to go.
Grade. Watch the yard during a storm or run a hose test and note where water goes and where it stops. Most drainage problems are grading problems, and adding a drain to a yard that slopes the wrong way just moves the puddle a few feet.
Often not. A French drain infiltrates water into surrounding soil, which works poorly in tight clay or above caliche. In much of the Valley, a graded swale or a surface-collection system piped to a legal outlet outperforms a buried infiltration trench.
A channel (trench) drain is a long linear grate that intercepts sheet flow across a patio or driveway. A catch basin is a box at a low point that collects and settles debris before the pipe. An area drain is a smaller grated inlet in a planter or lawn low spot. Most real systems combine them and are only as good as their outlet.
To a legal outlet — typically daylight at a lower point on the property, a street or alley discharge where the jurisdiction allows it, or an approved on-site retention feature. It cannot be dumped onto a neighbor's property. Requirements vary by city and HOA, so the outlet has to be settled before the system is designed.
Caliche is a cemented calcium-carbonate layer common in Arizona soils. It can be nearly impermeable, so water that reaches it stops. Any plan that relies on infiltration — dry wells, French drains, infiltration basins — needs a percolation test first to confirm water can actually leave.
They can, where soil below the caliche layer accepts water and the jurisdiction permits it. They are also the most oversold drainage product in the Valley. A dry well installed above an impermeable layer becomes a hole that fills up and stays full.
Permeable paver systems with an open-graded base can store and infiltrate meaningful volume when the subgrade and design support it. Standard pavers on a compacted ABC base drain across the surface like any hard surface, so they still need a grade plan and an outlet.
During — and designed first. Drainage is the layer everything else sits on. Installing turf, pavers, a pool deck, or an outdoor kitchen over an unresolved drainage problem means tearing part of it out later to fix the thing that should have been solved on day one.
Sometimes. It depends on the jurisdiction, the scope, whether grading volumes trigger review, and whether the discharge point touches the right of way. Confirming permit and discharge requirements with your city and HOA is part of planning, not an afterthought.
Yard flooding, ponding, or draining toward the house?
Send storm photos or a short video of where the water goes. We will tell you whether it is a grading problem, a collection problem, or an outlet problem before quoting anything.
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- Licensed, bonded & insured in Arizona. ROC 340966 (R-62) · ROC 341002 (R-3) · ROC 347738 (KA-5) · ROC 211530 (CR-21). Most Arizona contracting work valued at $1,000 or more — or requiring a permit — must be performed by a properly licensed contractor, subject to statutory exemptions. Verify the legal entity, license status, and classification with the Arizona Registrar of Contractors.
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