Start with where the water comes from.
A good paving grade begins with a larger property drainage picture.
Downspouts and concentrated building runoff.
Slopes, fields and neighbouring surfaces draining toward the area.
Low points, catch basins, channels and ditches.
Wet or soft areas that appear seasonally.
Surface grade connects fixed points.
Garages, roads, curbs, drains, docks and building entrances establish elevations. The paved surface needs to connect them while creating an intentional water path. Sometimes competing fixed points limit the available grade and require a more detailed drainage solution.
Sumas Prairie context
Flat agricultural ground can make small elevation changes and ditch conditions especially important. Describe wet-season ponding or soft areas even when they are not visible during a dry assessment.
Edges can protect—or admit—water.
Unsupported shoulders, broken edges and transitions to gravel can allow water and traffic to affect the pavement margin. Ditches and landscaped areas beside asphalt also influence how quickly water leaves the edge.
Look upslope
- Roof discharge
- Neighbouring ground
- Field and lane runoff
- Existing pavement flow
Look downslope
- Safe discharge point
- Ditch or collection system
- Building and property protection
- Shoulder stability
What to include in a drainage-related request.
Share the address, current surface, where water appears, when it occurs, nearby downspouts or ditches, known catch basins and whether the area becomes soft or inaccessible. Optional details can describe wet-weather photos available for later review.
Drainage work can involve property, municipal and environmental considerations beyond paving. Exact obligations should be confirmed for the specific project and work boundary.
Explore base preparation, grading and drainageSources and review notes.
- City of Abbotsford — Stormwater Management
- City of Abbotsford — Floodplain Ditch Maintenance Program
- City of Abbotsford — Environmental Regulations
Public sources were reviewed on August 26, 2026. They provide planning context and do not replace property-specific assessment or current authority confirmation.