What stormwater management rules apply to new driveways in NB?

New Brunswick municipalities are increasingly enforcing stormwater management requirements for new driveways and expansions of impervious surfaces, reflecting a growing focus on lot-level stormwater control to reduce flooding, erosion, and strain on municipal drainage infrastructure. While NB does not yet have a province-wide stormwater bylaw, Moncton, Fredericton, and Saint John all have regulations or guidelines that affect residential driveway projects, and failing to manage stormwater from your new driveway can result in drainage problems for you and your neighbours.

The fundamental principle is that stormwater from your property should not increase runoff onto adjacent properties or municipal infrastructure. When you replace a permeable surface (like a lawn or gravel area) with an impervious surface (asphalt or concrete driveway), rainwater that previously soaked into the ground now runs off rapidly. A typical NB rain event of 25mm produces approximately 500 litres of runoff from a 200-square-foot driveway expansion — water that must go somewhere without causing problems.

Moncton has been a leader in NB stormwater management and requires new developments and significant property alterations to maintain pre-development runoff levels. For residential driveway projects, this may mean directing runoff to a rain garden, dry well, or infiltration trench rather than toward the street or neighbouring properties. Moncton's engineering department reviews grading and drainage plans for new construction and major renovations. Fredericton has similar requirements through its site alteration and development permit process, with increasing emphasis on low-impact development techniques for residential properties.

Practical stormwater solutions for NB driveways include several approaches suited to the province's climate and soil conditions. Permeable pavers allow water to infiltrate through joints between the pavers into a gravel reservoir beneath, reducing runoff by 80-100% while providing a durable driving surface. They cost 20-40% more than standard pavers ($20-35 per square foot installed) but may eliminate the need for other stormwater infrastructure. Rain gardens — shallow planted depressions that collect and absorb runoff — are effective and attractive options for NB properties, using native plants adapted to both wet and dry conditions. A rain garden sized at 10-15% of the driveway's impervious area is typically sufficient for NB rainfall intensities.

Gravel or crushed stone driveways remain popular in rural NB and are inherently permeable, though they require more maintenance than paved surfaces. A middle ground is reinforced turf systems (plastic grid pavers filled with gravel or grass) that support vehicle weight while allowing infiltration. French drains along driveway edges ($15-25 per linear foot) can intercept and redirect runoff to appropriate discharge points.

Before beginning a driveway project, check with your municipal planning and engineering department about specific requirements. Many NB municipalities require a grading plan showing how stormwater will be managed, even for residential projects. Hiring a landscaping contractor experienced in stormwater management ensures your driveway meets current regulations and avoids creating drainage problems that can damage foundations, flood gardens, or cause disputes with neighbours.

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