In South Burnaby, near Deer Lake Park, the clay-rich glacial till holds water like a sponge. On Capitol Hill, sandy silt layers drain fast but trigger erosion. A geotechnical drainage design that works in one Burnaby neighborhood may fail in another. That is why every project here starts with permeability testing and groundwater monitoring. Without that data, a retaining wall or foundation can face hydrostatic pressure no concrete can resist. A good permeability test in the field tells us exactly how fast water moves through each soil layer, so we size drains correctly.
A perched water table just 1.5 meters deep after heavy rain is the main cause of basement leaks and slope failures in Burnaby.
Service characteristics in Burnaby
Typical technical challenges in Burnaby
The National Building Code of Canada (NBCC 2020) requires that water be directed away from foundations. In Burnaby, where clay-rich soils have low permeability, the real risk is not just surface water but subsurface water trapped behind retaining walls and below slabs. If the drainage system is undersized or the filter fabric clogs with fines, hydrostatic pressure builds up slowly over months. That silent pressure can crack a basement wall or trigger a rotational slide on a cut slope. The solution starts with proper soil classification and in-situ permeability testing before any pipe is laid.
Our services
We provide three core drainage design services for Burnaby properties, each tailored to the site's soil and slope conditions.
Subsurface French Drain Design
Trench drains with perforated pipe wrapped in geotextile, designed to intercept groundwater before it reaches the foundation. Sizing based on field permeability tests and site-specific rainfall intensity.
Curtain Drain Systems for Slopes
Interception drains installed along the crest or bench of cut slopes. Each drain is paired with a low-permeability cutoff to prevent water from re-entering the slope face. Ideal for Burnaby's hillside lots.
Waterproofing & Drainage Board Retrofits
For existing basements with chronic moisture, we design interior and exterior drainage boards, sump pump systems, and weeping tile upgrades. Each solution is sized after a minimum two-week groundwater monitoring period.
Frequently asked questions
How much does geotechnical drainage design cost in Burnaby?
A full drainage design package for a typical Burnaby residential lot runs between CA$1,100 and CA$2,940. The range depends on lot size, number of test pits, and whether a slope stability analysis is needed. Contact us for a quote tailored to your site.
Do I need a drainage design if I already have gutters and downspouts?
Yes. Gutters handle roof runoff, not subsurface groundwater. In Burnaby's clay-rich soils, water can sit against your foundation wall for days after rain stops. A geotechnical drainage design addresses that hidden water, which gutters cannot touch.
How long does the design process take from site visit to final report?
Typically 7 to 14 business days. The timeline includes fieldwork (test pits, permeability tests, groundwater monitoring), laboratory soil classification, and drafting the construction drawings and specifications. We can expedite to 5 days if needed.
What happens if I skip drainage design and just install a pipe?
You risk undersizing the pipe or placing it at the wrong depth. In Burnaby, a basic pipe installed without design often clogs with fines or fails to intercept the perched water table. That leads to wet basements, cracked walls, or slope movement. A proper design costs less than one repair.