Serving the Cowichan Valley
Excavation and drainage work in Cowichan Bay
Clay ground, farmland designation and a floodplain — three constraints that decide most of what happens on a Cowichan Bay site.
Free, no-obligation quote
Excavation quote request
The more detail about the property and the work, the closer the first number will be. We send a written quote after we visit your site.
Duncan Excavating works across Cowichan Bay, where the CVRD community plan marks the ground as highly impervious clay soils and about 70 per cent of the land sits inside the Agricultural Land Reserve. We plan your drainage, fill and soil removal around both requirements from day one.
Cowichan Bay is the hardest ground in this service area to judge without seeing it. Two properties a few hundred metres apart can sit on entirely different material, and the designation on the title changes what may legally be done with the soil that comes out.
We take more time digging in Cowichan Bay clay than in valley sand, and we must cut drainage trenches deeper to establish proper fall. If your property is in the Agricultural Land Reserve, you must observe a statutory waiting period before we move fill or soil. All three show up in your quote here.
Clay, slope and where the water ends up
The CVRD community plan identifies dense, impervious clay across Cowichan Bay. Clearing trees on steep slopes allows heavy rain to cause rapid soil erosion and landslides. We take that at face value. On clay lots, drainage design comes first because we must clear sloped vegetation in stages rather than all at once. When we dig a perimeter drain here, we give the trench extra slope because clay will not give up fall easily.
Farmland rules and the floodplain
About 70 per cent of the land in the plan area, excluding water, is inside the Agricultural Land Reserve, with just over half of that classed as active farmland — the highest proportion of any community in this service area. Placing fill or removing soil on those parcels requires a Notice of Intent to the Agricultural Land Commission at least 60 days beforehand, at a fee of $150, and construction and demolition waste, asphalt, glass, treated wood and unchipped lumber are prohibited in fill outright. The Koksilah Village area sits within the floodplain of the Cowichan and Koksilah rivers over an aquifer the regional district describes as highly vulnerable to contamination.
Working in clay
Clay holds water and resists movement far more than loose sand or gravel. When we dig in heavy clay, the material sticks to the bucket and takes longer to load into trucks. Wet clay also packs tightly under tracks, so we plan machine paths carefully to avoid turning your lot into mud.
Drainage runs in clay need careful attention to slope. Water does not soak through dense clay quickly, so trenches require extra fall to carry runoff away from your house. We shape ditch lines and trench beds smoothly so water moves freely toward its outlet without pooling on your property.
What happens on the day
We arrive with the machine on a transport trailer and unload near your access point. Before starting the engine, we do a final walk on your lot with you to confirm the dig markings and work area.
As the operator digs, material is placed directly into waiting trucks or stacked safely back from trench edges. We keep track of depth and levels continuously so footings or trenches match your plan. Once the earthmoving is done, we sweep hard surfaces, clear loose spoil from access routes, and make sure the site is left orderly before loading the machine back onto the trailer.
If you're planning work on a Cowichan Bay property, request a quote — we'll check the clay and the designation on site.
Excavation services
- Lot Clearing and GradingLand clearing in Duncan and the Cowichan Valley — brush, stumps, topsoil, grading. We walk your lot first, then quote each stage and the haul-out separately.
- Perimeter Drains and DitchingWe install perimeter drains, foundation drainage, and water and sewer service trenching in the Cowichan Valley, where groundwater medians sit at 2.4 metres.
Nearby service areas
Ready for a quote on excavation in Duncan?
We quote excavation across the Cowichan Valley after a site visit.