Drainage Solutions
in Delta, BC

Delta is one of the most geographically varied municipalities in Metro Vancouver. The Ladner area sits on the Fraser River delta — some of the flattest, lowest-lying farmland-turned-residential land in the region, with water tables that are very close to grade through much of the year. Tsawwassen, by contrast, is built on a peninsula with sandy soils and adequate natural drainage, though its coastal exposure brings its own humidity challenges. North Delta occupies the hillside terrain rising toward the Burns Bog plateau, where clay-heavy soils on steeper slopes create surface drainage issues rather than high water table concerns.

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.