Many Coquitlam communities are shaped by desirable topography, including natural slopes and ravines that enhance your property’s locale. However, steep terrain can be susceptible to landslides if the slope becomes weak and unstable. While the risk of slope failure and landslides is relatively low, it’s advisable to watch for signs that may compromise a slope’s strength and structure.
Signs of Slope Failure
Cracks along your yard near the slope
Extensive saturation, i.e. after continuous periods of heavy rains
Increase in water levels at the bottom of the ravine (when debris fills the channel bed)
Leaning trees, retaining walls or fences
Soil separating (moving) from foundations or structures
How to Protect Your Slope
Avoid placement of sheds, pools, decks or patio at the top of the slope or adding excessive weight
Avoid placing fill (yard waste included) at the top of the slope or near drainage channels, including building retaining walls to raise your property
Comply with City guidelines and bylaws for your own protection
Divert water away from the slope, including roof drainage
Exposed soils increase slope instability; plant native trees suited for Coquitlam’s weather/climate
If water is draining to the ravine or slope, pipe it to the bottom of the slope to prevent saturating the slope
Maintain the slope’s vegetation to strengthen its stability
As a homeowner, you are responsible for managing and maintaining your lot, including steep slopes. If you see signs of instability on your slope, please contact the City’s Engineering and Public Works Department at 604-927-3500.
Annual Ravine Inspections
The City conducts ravine inspections annually to proactively manage the risk of landslides. Due to steep slopes in the Chines Escarpment, Associated Engineering conducted a slope stability assessment in 2013, a qualitative analysis based on interpretation of the topographic data and visual site observation. Golder Associates later conducted a detailed geotechnical investigation for properties along Corona Crescent.