How to Install a Perfect Drainage Trench (Step-by-Step)

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How to Install a Perfect Drainage Trench (Step-by-Step)

A proper drainage trench is one of the most effective ways to protect your home from water damage, soil erosion, basement leaks, and foundation problems. Whether you’re dealing with pooling water after rain, soggy soil, or moisture around the foundation, a well-built trench can redirect excess water safely away — and it’s surprisingly simple to install.

This guide walks you through each step using the method shown in the images, ensuring a durable, long-lasting drainage system you can rely on.

1. Digging the Trench

Start by digging a straight trench along the area where water collects.
For most homes, this is around the foundation or near a downspout.

Depth & Width Guide:

  • Depth: 30–45 cm
  • Width: 20–30 cm
  • Slope: Maintain a gentle downward slope (about 1–2%) to help water flow.

Remove loose soil and smooth the base so the pipe will sit evenly.

2. Adding the Liner

Lay a heavy-duty landscape fabric inside the trench. This prevents soil from clogging the drainage pipe and keeps the trench clean over time.

Pull the fabric up the sides of the trench and secure it temporarily with a few rocks.

Why this step matters:

  • Prevents soil erosion
  • Extends the lifespan of the drainage system
  • Allows water to pass through while blocking debris

3. Installing the Pipe and Rock Layer

Place a perforated drainage pipe at the bottom of the trench, holes facing downward.
Next, add a layer of small gravel or crushed rock to surround the pipe.

Fill until the pipe is fully covered.

Benefits of using rock:

  • Enhances water flow
  • Protects the pipe from collapsing
  • Reduces blockages over time

Once filled, fold the extra liner fabric over the top — this creates a protective filter layer.

4. Finishing the Trench

With the pipe and rock installed, add the final top layer of larger decorative stones.
This creates a clean, polished look and keeps the system accessible for future maintenance.

A finished trench:

  • Redirects water away from your home
  • Prevents foundation moisture
  • Reduces standing water after heavy rain
  • Improves landscape drainage

It’s a simple DIY project that provides long-term protection and increases the health of your yard and home structure.

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