Drainage System
Learn about drainage systems in Canadian real estate, what they include, why they’re important, and how they prevent costly water damage.

May 30, 2025
What are Drainage Systems?
A drainage system refers to the infrastructure and design features that remove excess water from a property to prevent flooding, water damage, and structural deterioration.
Why Do Drainage Systems Matter in Real Estate?
In Canadian real estate, proper drainage is essential for protecting a property’s foundation, basement, and surrounding land from water infiltration.
Drainage systems may include:
- Eavestroughs and downspouts
- French drains and weeping tiles
- Grading and swales
- Sump pumps and catch basins
Inadequate drainage can lead to basement flooding, mold, and expensive repairs. Many home inspections assess drainage effectiveness, especially in older homes or high-precipitation regions.
Understanding drainage systems helps homeowners maintain their property and identify potential red flags when buying real estate.
Example of Drainage Systems in Action
A home’s grading slopes away from the foundation and includes downspouts that extend two metres, forming part of an effective drainage system.
Key Takeaways
- Prevents water damage and erosion.
- Includes gutters, grading, and sump systems.
- Essential for foundation integrity.
- Evaluated during inspections.
- Impacts home insurance and resale value.
Related Terms
- Foundation
- Sump Pump
- Floodplain
- Home Inspection
- Water Table

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