NDS channel drains are a family of linear surface drainage systems that capture sheet water from hardscapes and carry it to a drain pipe. Spanning narrow decorative profiles up to high-capacity systems, NDS channel drains give homeowners, landscapers, and contractors a single source for matching the right drain to almost any driveway, patio, walkway, or commercial surface.

NDS channel drains span a wide range of widths and capacities.

What are NDS channel drains?

NDS channel drains all share the same job — intercepting water along a line and conveying it to an outlet — but they differ in width, depth, capacity, and appearance. That range is the point: a pool deck needs a slim, attractive profile, while a commercial driveway needs a wide, high-flow channel. Buying within one manufacturer's family keeps grates, outlets, and fittings compatible across a project.

The NDS channel and trench drain lines

NDS makes several channel and trench drain lines, each suited to a different flow volume and setting:

• Micro Channel: about 1-1/4 inch wide, for light flows around pools, spas, patios, and walkways.
• Slim Channel: about 2-1/4 inch wide, a low-profile, decorative option for light sheet flow on hardscapes.
• Mini Channel: about 3 inches wide, a narrow trench drain that blends subtle looks with surprising strength.
• Pro Series Channel: available in 3, 5, 8, and 12 inch widths, scaling from driveways and patios up to plazas and high-flow areas.
• Spee-D Channel: a high-capacity, lightweight alternative to poured concrete trench drains.
• Dura Slope: a modular system with a built-in slope and ductile iron grates for heavy, deep applications.

Grate options across the range

NDS channel drains accept a variety of grates — plastic in several colors, decorative botanical and wave patterns, and heavy-duty cast iron — so the visible surface can be matched to the setting and the expected traffic. Decorative grates suit residential hardscapes, while cast iron and heavy-duty grates suit higher-traffic and commercial locations.

A decorative cast iron grate option for NDS channel drains.

Choosing among NDS channel drains

Start with the flow and the setting, then pick the line and width, and finally choose a grate to match the look and traffic. For light residential flows, Micro, Slim, or Mini; for driveways and larger areas, Pro Series; for the heaviest flows, Spee-D or Dura Slope. The Channel and Trench Drain Selector walks through the choice, and the collection shows the full range.

Installation: slope, base, and concrete surround

The NDS plastic channel lines (Micro, Slim, Mini, Pro Series, and Spee-D) install with the same core method: a leveled gravel and concrete base, a positive slope toward the outlet, and a concrete surround that locks the channel in place flush with the finished surface.

1. Excavate the trench. Dig along the drainage line wider and deeper than the channel itself, allowing room on the bottom and both sides for a concrete bed and surround (a common rule of thumb is roughly 3 to 4 inches of concrete beneath and around the channel, though you should follow the project drawings).
2. Set a slope toward the outlet. Surface drainage needs fall to move water. A widely used target is about 0.5 to 1 percent (roughly 1/8 inch of drop per foot of run), pitched toward the outlet end. On flat sites you create this by grading the trench bottom; check it with a level and string line before you commit.
3. Lay a concrete bed. Place a bed of concrete in the bottom of the trench and seat the channel into it at the right height and slope, so the top of the grate will finish flush with the surrounding hardscape.
4. Stabilize with anchor clips or stakes. Use the line's anchor clips or 6 inch profile installation stakes to hold the channel at the correct height and alignment so it does not float or shift when concrete is placed around it.
5. Pour the concrete surround. Place concrete up both sides of the channel to encase it. Keep the grate or a protective cover on during the pour so concrete does not enter and set inside the channel.
6. Finish flush. Bring the surrounding concrete or pavers level with the top of the grate so water sheets cleanly into the channel and the grate is not a trip hazard.

Getting the slope right

Slope is the single most important detail. Without fall toward the outlet, water sits in the channel instead of draining. For straight channel lines, grade the trench bottom to about 0.5 to 1 percent toward the outlet. The Dura Slope line removes this step by building a 0.7 percent slope into its stepped sections. Either way, confirm positive drainage with a level before the concrete sets, because corrections are difficult afterward.

The concrete surround

A channel drain is only as stable as the concrete around it. The channel should sit on a concrete bed and be encased on both sides so it cannot shift or float, with the grate finishing flush with the surrounding surface. The depth and strength of that surround should match the traffic: light foot traffic on a patio needs far less than a driveway or commercial area that sees vehicles, where a thicker, reinforced surround and a load-rated grate are required. Always follow the project drawings or manufacturer guidance for the bedding and surround dimensions.

For fiber-reinforced concrete trench drains, installation follows the same principles — an excavated trench, a concrete bed, a slope to the outlet, and a concrete surround sized for the load class — but the heavier sections and higher load ratings make these systems most common on commercial and municipal sites where engineered drawings specify the bedding and surround.

Frequently Asked Questions