Sensitive clay and landslide constraints

Check mapping and constraints before excavation, fill, walls, drainage, pools or additions near a slope.

VERT / GREEN

Check address/lot with municipality/MRC and keep the applicable map.

JAUNE / YELLOW

In some clay zones, inappropriate human interventions can trigger or worsen slope movement.

ROUGE / RED

Property in a constraint zone, ground movement/cracks, eroding slope or planned excavation: geotechnical/permit review before work.

Interactive triage

Helps choose the next step; it does not replace design, permits or professional diagnosis.

Mapped-zone status unknown
Check the lot before sizing exterior work. Slope/bank near work
Verify setbacks, drainage and municipal constraints. Ground movement/cracks
Stop excavation/fill and obtain geotechnical assessment. No ground alteration
Keep mapping in the home record for future work.

Useful tools and data

MRC/municipal map
Topographic plan
Drainage/movement history

What the professional checks

Confirm constraint category
Assess stability and drainage
Define permit conditions

Official sources

Checked 2026-08-22.

Québec — OGAT et glissements de terrain

V16

Advanced diagnostics to cross-check

V16 connects water, soil, climate, safety, materials and seasonal use to existing projects.

Rainwater and greywater