Direct surface water
Grade nearby soil so runoff does not pour over the top or collect behind the wall. Extend downspouts to suitable discharge areas and keep swales open.
Provide drainage behind the wall
Appropriate free-draining material, filter fabric, and drain components help relieve water pressure. Requirements vary by wall type, height, soil, and site.
Protect the outlet
A drain only works if it has a clear, durable place to discharge. Keep outlets visible and free of soil, roots, nests, and debris.
Know when engineering matters
Tall walls, structures near the wall, steep slopes, property lines, and surcharge loads can require permits or engineering. Confirm requirements before construction.
Watering rules, rebate programs, permit requirements, and product instructions can change. Confirm current requirements with the appropriate local agency or manufacturer.