Drainage by Application · Home & Residential
Puddles at the door, pavers heaving every winter, a green film creeping across the walkway — flat hardscape holds water, and held water wrecks it. The fix is a narrow channel or a well-placed basin, sized for foot traffic and tucked into the surface you already have.
Patios are poured or laid nearly flat by design — a comfortable surface for chairs and tables leaves little room for pitch. Add a few seasons of settling, usually toward the house where the backfill was, and the low edge is now your door threshold. Water stands after every rain, wicks under the sill, and in winter refreezes into a sheet exactly where you step out.
Sidewalks and garden paths have the opposite problem: they interrupt the natural flow of the yard. A walkway laid across a slope becomes a dam — water ponds on the uphill side, saturates the base, and the slabs tilt and crack. On pavers, trapped water washes fines out of the joints, breeds moss and algae, and turns the surface slick. None of this needs a regrade; it needs a drain at the wet line.
Patios and walkways are the home turf of Class A (Light Duty) — rated for pedestrians, bicycles, and wheelchairs. But before you spec Class A everywhere, walk the route in your head:
The full A–F breakdown, with PSI ranges and capacities, is in the Load Class Recommendation Guide. For any walkway on an accessible route, read our ADA drainage guide before choosing grates — opening size and orientation are regulated, and the wrong grate is a tear-out.
Low-profile · paver retrofits & shallow trenches
The Slim Channel's shallow body is the retrofit answer: it drops into a trench that stays above most paver bases and slab edges, so you can lift one course of pavers, set the channel, and re-lay — no excavation below the bedding. It is the system we recommend first for existing patios with a wet edge. Details and install guidance in the Slim Channel FAQs & resources.
Thresholds · garden paths · landscape edges
For new pours and threshold runs, the Spee-D Channel is the classic residential channel drain — light, modular, and easy to set to grade. Where the trench needs to disappear, the Mini and Micro channels shrink the grate line to a narrow slot that reads as a joint in the hardscape. All three take snap-in grates in multiple styles. See the Spee-D FAQs and Mini Channel FAQs for dimensions and grate options.
Point drainage · low corners & downspout tie-ins
When the water gathers at one spot rather than along a line — a low corner of the patio, the base of a step, a downspout that discharges onto the walk — a small catch basin is simpler and cheaper than a channel run. Square basins take decorative and cast iron grates that look intentional in a finished hardscape, and the basin doubles as a cleanout for the pipe run. Discharge through a pop-up emitter in the lawn, or consider permeable pavers where you would rather soak the water in than pipe it out.
Public sidewalks · plazas & streetscapes · quote-only
Municipal sidewalks, storefront frontages, and plaza work call for engineered channel systems with certified load ratings and ADA-compliant grate options — ACO's KlassikDrain line covers the range, including heel-resistant slotted designs. ACO products are quoted per project rather than sold from the cart: send the run length, load class, and grate requirement to our quote desk and pair it with the ADA guide for grate selection.
| Situation | System | Load class to spec |
|---|---|---|
| Water ponds at the door threshold | Spee-D Channel across the threshold | Class A |
| Existing paver patio, shallow base | Slim Channel (low-profile retrofit) | Class A |
| Trench line should disappear | Micro or Mini Channel | Class A |
| One low corner or downspout splash zone | Catch basin + decorative grate | Class A; B if wheels cross |
| Walkway crossed by mower or carts | Any channel above with an upgraded grate | Class B at the crossing |
| Public sidewalk, plaza, streetscape | ACO KlassikDrain — request a quote | Class B+ with ADA grates |
Patio drains rarely fail from too little grate — they fail from nowhere to send the water. Before ordering, trace the pipe route to a legal discharge point: daylight at a lower grade, a pop-up emitter, or a dry well where the lot is flat. Then estimate the flow with the Runoff Calculator — include roof area if downspouts feed the patio — and sanity-check the method in Sizing for Storms. A small channel with a well-sized outlet beats a big channel with a crushed 2" hose every time.
Class A (Light Duty) is the correct rating for pedestrian-only patios and walkways. Spec Class B where anything with wheels crosses the grate — riding mowers, garden tractors, or a walkway that doubles as a cart path.
Lift only the course of pavers along the wet edge or low point, set a low-profile channel such as the NDS Slim Channel or a small catch basin on a compacted base, pipe it to discharge, and re-lay the pavers to the grate edge. Shallow-depth channels exist specifically so the trench does not have to go below the paver base.
Accessible routes limit grate openings to 1/2" in the direction of travel, with elongated openings placed perpendicular to the path so wheels and cane tips cannot drop in. Our ADA drainage guide covers the requirements and compliant grate choices in detail.
Patios settle toward the house over time, and a slab poured flat holds water at the lowest edge — often the door. A narrow channel drain set across the threshold intercepts the sheet flow before it reaches the sill and pipes it away from the foundation.
Send us the width, load class, and flow rate — we'll spec the right system and quote it same-day.
Need a volume or project quote? Request a quote instead. Prefer to talk it through? Call 803-324-3225, email [email protected], or use the contact form.
