Do I need a catch basin installed at the bottom of my sloped driveway in Orleans?

If your driveway slopes downward toward your garage or creates a low point where water collects, a catch basin is often the most effective solution — and in some cases, it may be required by the City of Ottawa's grading and drainage standards.

When a Catch Basin Is Necessary

A catch basin is strongly recommended or required when:

• Your driveway slopes toward the house or garage (reverse grade)


• Water pools at the base of the driveway with no outlet to the street


• Spring thaw or heavy rain sends water toward your foundation


• The City of Ottawa lot grading plan for your subdivision specifies one

Many homes in Orleans — particularly in newer developments like Avalon, Mer Bleue, and Chapel Hill — were built with downward-sloping driveways to accommodate the street grade. These designs rely on a functioning catch basin to prevent flooding.

How Catch Basins Work

A catch basin is a below-grade concrete or plastic box with a grated top that collects surface water and routes it through an underground pipe to the municipal storm sewer or a dry well. The basin includes a sediment trap at the bottom to catch debris before it enters the pipe. For a residential driveway, a standard 300mm (12-inch) catch basin is typical.

Installation Details for Ottawa

The basin must be positioned at the lowest point of the driveway where water naturally collects. The underground pipe must maintain a minimum slope of 1% toward the discharge point. In Ottawa's climate, the pipe should be bedded in clear gravel and the connection to the storm sewer must be watertight to prevent infiltration that could cause frost heaving.

During winter, catch basin grates can become blocked by ice and compacted snow. Many Orleans homeowners keep the grate area clear with calcium chloride or a small amount of road salt to ensure meltwater can drain during January and February thaws.

Ontario Building Code Connection

While the OBC does not specifically mandate catch basins for every driveway, it does require that surface water be directed away from the building foundation. If your driveway grade makes this impossible through surface flow alone, a catch basin becomes the code-compliant solution. Your original lot grading certificate (filed with the City) may specify drainage infrastructure that must be maintained.

Cost Range

A single residential catch basin with 5-10 metres of underground pipe runs $2,000 to $4,500 installed. If the pipe run needs to extend 15+ metres to reach the storm sewer connection, costs can reach $5,000 to $7,000.

Browse Ottawa Driveways to find Orleans contractors experienced with catch basin installation and driveway drainage systems.

---

Looking for experienced contractors? The Ottawa Construction Network connects Ottawa homeowners with qualified professionals:

• Justyn Rook Contracting
• JC Carpentry
• ALM Construction & Landscaping Inc.
• Renovo Construction
• Eastern Residential Solution

View all contractors →