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Document imprimable.pdf

Concentrated Water Sources

Prior to constructing the wall, review drainage plans and details to identify all potential sources of concentrated water. Examples that must be accounted for are:
  • Driveways
  • Slopes above walls
  • Grading of site
  • Water lines, mains or fire hydrants
  • Roof down spouts
  • Sump pump outlets
  • Irrigation systems

          Maîtrise de l'eau

Drain Pipes

Sites with poor draining soils or walls over 4 ft.(1.2 m) tall will require a toe drain.
Drain pipes used in toe drain applications must be properly vented a minimum of every 50 ft.(15 m). To accomplish this, vent the drain pipe to daylight or a lower elevation on the site.
When venting to a lower elevation, it is important that all drain locations are properly marked and protected to ensure that the drain pipe is not damaged or plugged. Rodent screens can be used to allow the water to flow through the outlet pipes and keep the pathway clear of debris.
Ecoulement par le bloc
Maîtrise de l'eau
Ecoulement en direction d'une zone inférieure
Maîtrise de l'eau


During wall layout it is important to evaluate the entire site to determine if water will drain into the area where the wall will be constructed. Temporary grading may be needed to ensure water will not drain towards the construction area.

Ground Water

Ground water can be defined as water that occurs within the soil. Sources include surface infiltration, water table fluctuation and layers of permeable soils. Ground water movement must be prevented from coming in contact with the wall structure, including the soils behind the wall.

If subsurface or ground water is encountered during construction, consult an engineer to ensure that the water has been accounted for in your design.

When do I need Drain Pipes?

Follow these rules of thumb:

  • All walls taller than 4 ft (1.2 m)
  • Sites with poorly draining soils
  • Alongside paved areas
  • With slopes above the wall
  • On multi-tiered and terraced walls
  • All commercial and municipal projects
Drainage Drainage
Use a drain pipe to route water from behind the wall. Attach tee fittings at 30 ft. to 50 ft. (9 to 15 m) intervals and direct the drains out through the wall face.

Typical Drain

Drains must be vented to daylight or connected to a storm sewer system and must be protected from migration of fine material.
Ecoulement de l'eau
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