Drainage Solutions
in Silver Valley, BC

Silver Valley is one of Maple Ridge's newest residential communities, carved out of forested hillside on the slopes above the Alouette River valley. Development here has been ongoing since the 1990s and continues today, with the community still adding new streets and neighbourhoods on the upper mountain slopes. The terrain is steep, the soils are a mix of shallow glacial till and more organic forest soils, and rainfall is higher than the valley floor due to the orographic effect of the adjacent mountains.

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.