Heavy rainfall can quickly overwhelm storm sewers—especially in urban and suburban areas where driveways, patios, and roofs prevent water from soaking into the ground. A soakaway is a simple, eco-friendly solution that helps manage rainwater locally on your property. It collects runoff from roofs and paved surfaces and allows it to gradually infiltrate the soil instead of flowing into the municipal drainage system. Here’s a detailed guide to what a soakaway is, how it works, and how to make sure it performs effectively in Canadian conditions.

What Is a Soakaway?

A soakaway is essentially an underground chamber that temporarily stores rainwater and lets it slowly seep into the surrounding soil. It acts as a buffer, reducing the load on storm drains and helping to prevent flooding.

Traditionally, soakaways were filled with gravel or rubble, but modern systems often use plastic crates or modular units with a high void ratio. These are lightweight, easy to install, and can be configured to suit different property sizes and soil types.

The soakaway is usually installed in the yard or garden, connected to downspouts or surface drains via underground pipes. When it rains, water flows into the soakaway, where it’s held until it gradually infiltrates the ground.

Why Install a Soakaway?

There are several benefits to having a soakaway on your property:

• Reduces pressure on storm sewers – helps prevent street and basement flooding during heavy rain.
• Environmentally friendly – keeps rainwater within the local water cycle and supports groundwater recharge.
• Protects your home – directs water away from foundations, reducing the risk of dampness and structural damage.
• Supports sustainable landscaping – helps maintain natural soil moisture and reduces erosion.

In some Canadian municipalities, managing stormwater on-site can also help you meet local sustainability or building code requirements.

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What Is a Soakaway? How to Ensure Effective Rainwater Drainage on Your Property

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Learn how a soakaway can help you handle heavy rainfall more effectively. This guide explains what a soakaway is, how it works, and how to install and maintain one to keep your property dry and eco-friendly.

How the Infiltration Process Works

When rainwater enters the soakaway, it fills the empty spaces within the structure. From there, it seeps out through the sides and bottom into the surrounding soil. The rate of infiltration depends largely on soil type: sandy or loamy soils drain quickly, while clay soils retain water and may require a larger soakaway or additional drainage measures.

To keep the system working efficiently, it’s essential to install a filter trap or silt trap before the soakaway. This prevents leaves, grit, and debris from clogging the system.

A properly sized soakaway can handle even intense downpours, but it must be designed according to the roof area, local rainfall patterns, and the soil’s infiltration capacity.

How to Install a Soakaway

You can hire a licensed drainage contractor to do the work, but many homeowners choose to install smaller systems themselves. Here are the key steps:

1. Test the soil’s infiltration rate. Dig a small test pit, fill it with water, and measure how long it takes to drain. This helps determine the required soakaway size.
2. Choose the right location. The soakaway should be at least 5 metres (about 16 feet) from your house and 2 metres (about 6 feet) from property boundaries. Avoid areas with high groundwater or poor drainage.
3. Excavate the pit. The size depends on your roof area and soil type.
4. Line the pit with geotextile fabric. This prevents soil from entering the soakaway while allowing water to pass through.
5. Assemble and place the soakaway crates or modules. Connect them to your downspout or drainage pipe.
6. Backfill and cover. Wrap the top with geotextile, then cover with soil and turf or gravel.

Before starting, check with your local municipality or conservation authority—some areas have specific regulations for stormwater management or groundwater protection.

Maintenance and Lifespan

A soakaway requires minimal maintenance, but regular inspection is important. Clean the silt trap or filter once or twice a year to prevent blockages. If the system becomes clogged, water may back up or pool on the surface.

Modern soakaway units can last 30–50 years if properly installed and maintained. Keep an eye on how quickly water drains after rainfall; standing water may indicate that the soil is saturated or that the system needs servicing.

A Smart Investment for a Changing Climate

With more frequent heavy rain events across Canada, local stormwater management is becoming increasingly important. A soakaway is a practical and sustainable way to handle rainwater on your property—protecting your home, reducing strain on public infrastructure, and supporting a healthier environment.

It’s an investment that pays off over time: less flooding risk, better drainage, and a more resilient property ready to face the challenges of a changing climate.