Drainage Solutions
in Richmond, BC

Richmond sits on Lulu Island and Sea Island in the mouth of the Fraser River, which means it occupies some of the lowest-lying land in Metro Vancouver. Much of the municipality sits at or below sea level, held above water by an extensive dyke system. For homeowners with crawlspace foundations — common in the older residential areas of Steveston, Brighouse, and the City Centre neighbourhoods — the water table is a constant consideration. In many areas of Richmond, the water table is within two to four feet of grade year-round, and it rises higher during wet periods. A vapor barrier alone is insufficient in these conditions; active pumping through a properly sized sump system is generally required to keep crawlspaces dry.

Drainage problems in crawlspaces have two distinct origins: water that arrives from outside (surface runoff, failed exterior drainage, high water table) and water that condenses from the air inside the crawlspace onto cooler surfaces. The solutions for each are different, and correctly diagnosing which problem you have — or which combination — is the critical first step. Applying interior drainage solutions to an exterior water problem provides partial relief at best; addressing the exterior source is far more effective and usually less disruptive.

Interior drainage systems — perimeter drain tile installed inside the crawlspace along the base of the stem wall — are the right solution when exterior work is impractical (due to finished landscaping, hardscaping, or very tight site conditions) or when the primary issue is groundwater rising from below rather than surface water entering through the wall. Interior drain tile channels water to a sump pit where a pump removes it. This approach does not stop water from entering the foundation, but it manages it effectively once it does.