NDS channel drain installation involves excavating a trench along the drainage line, setting the channel sections to slope toward an outlet, connecting that outlet to underground drain pipe, and securing the channel in concrete so the grate finishes flush with the surface. Done correctly, the result is a clean linear drain that captures sheet water and keeps hardscapes dry.

How NDS channel and trench drains install

Most NDS channel and trench drains follow the same general installation sequence:

1. Excavate the trench along the drainage line, deep and wide enough for the channel plus a concrete bed and surround.
2. Set the channel to slope. Lay the sections so water runs toward the outlet. Some lines (like Dura Slope) have a built-in slope; others rely on the trench grade.
3. Connect the outlet to underground drain pipe at the end or bottom outlet.
4. Stabilize and pour. Use anchor clips or stakes to hold the channel while concrete is placed around it, keeping the grate flush with the finished surface.
5. Finish flush and add grates. Bring the surrounding hardscape level with the grate so water sheets into the channel.

Getting the slope right

Slope is what makes a channel drain work. Water must run toward the outlet rather than sitting in the channel. Some NDS lines, such as Dura Slope, build the slope into the channel sections themselves, which simplifies achieving fall on long runs. Other lines rely on grading the trench so the channel pitches toward the outlet. Either way, confirm positive drainage before the concrete is placed.

Installation tips

• Use anchor clips or stakes to hold the channel in position and at the right height during the pour.
• Keep the grate flush with the finished surface so water sheets in cleanly and the grate does not become a trip hazard.
• Protect the channel during the pour so concrete does not enter and set inside it.
• Plan the outlet and its connection to drain pipe before you start, so the run pitches to the right spot.

Match the system, then install

Correct installation starts with the right system for the flow and depth. The Channel and Trench Drain Selector can match an NDS line to your project so the installation goes smoothly, and the collection lists channels, outlets, and grates.

Base and concrete surround specifications

Here is the full method, including slope, base, and concrete surround detail.

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.

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 a 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.