Design decision
Why this idea works
Side yards funnel roof and surface water toward the house, and a planted swale beside the slab gives that water a defined route away, slowing and filtering it as it goes. It keeps the foundation dry and the side yard usable, handling drainage with planting rather than a bare ditch or a hidden pipe.
- The tradeoff
- The layout sets a clear direction, but it also commits the project to fixed relationships. Grade the swale away from the house and detail the slab edge.
- How to measure it
- Conceptual range: the side-yard slab plus a separately measured planted swale.
On your property
Plan it for your site
Detail the slab edge cleanly against the swale so the slab holds while the channel drains, and grade the swale gently away from the house. Plant it with species that handle intermittent flow and stabilize a narrow channel.
- Grade the swale gently away from the house so water leaves the foundation.
- Detail the slab edge so runoff enters the swale without undercutting.
- Plant the swale to handle intermittent flow and stabilize the channel.
Before forms are set
Build implications
- Confirm before estimating A swale graded away from the house.
- Confirm before estimating A stable slab edge feeding the swale.
- Confirm before estimating Planting that stabilizes an intermittent channel.
- Measure the site and establish elevations Record boundaries, thresholds, grade changes, utilities, and the dimensions of vehicles, furniture, equipment, or structures that affect the layout.
- Test how the space will be used Check walking routes, turning paths, door swings, working clearances, maintenance access, and the route back to the house or street.
- Resolve drainage, services, and structural support Decide where water goes and coordinate drains, conduit, irrigation, fuel, electrical work, footings, and independent supports before forms are set.
- Define and estimate each concrete element Confirm the slab or footing section, base, joints, edges, and finish, then estimate simple measurable fields separately from steps, walls, drains, and supported features.
Prevent these problems
- Calling a retaining element decorativeA wall or planter that holds soil or water needs support, reinforcement, drainage, and often professional review.
- Hiding runoff with plantingA rain garden, swale, or planted edge must receive water intentionally and have a safe overflow route.
- Choosing the finish before defining the jobSeat walls, planters, edging, terraces, and retaining walls may look related but carry very different loads and details.
Next step
Turn the idea into your estimate
Enter measurements from the property. The conceptual image does not provide a takeoff.
Estimate a similar concrete featureQuestions this idea raises
What is a planted swale?
A shallow, gently graded, planted channel that carries and slows runoff, filtering it as it goes, used as a green alternative to a bare ditch or hidden pipe. It routes water away deliberately.
Why route side-yard water away from the house?
Side yards funnel water toward the foundation, so a swale directing it away keeps the house dry and the yard usable. Grade it gently away from the house.
- Best when
- Drainage-aware features
- Reconsider when
- Reconsider the idea if retained soil or water, footing and reinforcement needs, drainage, and long-term access cannot be resolved on the property.
- Verify first
- Grade the swale away from the house and detail the slab edge.
- Professional input
- Landscape or concrete contractor; engineer for retaining or structurally loaded work
Sources and further reading
- American Concrete InstituteTechnical context for seat walls, planters, and small structural concrete elements.
- EPA: Types of Green InfrastructureContext for rain gardens, planted swales, and water-aware transitions beside concrete.
- NRMCA CIP 6: Joints in Concrete Slabs on GradeA starting point for jointing terraces, landings, and larger flat features.
