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Water Management

Document imprimable.pdf
The design and performance of most retaining walls are based on keeping the reinforced zone relatively dry. To ensure that wall structures perform, the construction of the wall and layout of the site must be based on maintaining a soil moisture content that is relatively low. Relatively low equates to the moisture content required to achieve desired compaction.

Site civil engineering firms utilize a thorough understanding of the site to determine where water will come from and how it will be properly managed. Throughout their design process, sources of water are taken into account to handle above and below grade concentrations of water.

Contractors must understand the intent of the approved site plans and what will be required to protect the area impacted by the wall construction. Temporary berms may be required to direct water away from construction sites.

Allan Block walls may be designed with an array of details to ensure that the wall and reinforced soil structure remain free of excess moisture. Basic design details mandate toe drains for all walls over 4 ft. (1.2 m) in height, with slopes, or other structures above the wall. Once geogrid is introduced into the design, heel drains are also incorporated. In all cases wall rock is located within the cores of the block and a minimum of 12 in. (300 mm) behind the block. These three details are designed to remove incidental water within their respective locations and are not meant as primary drainage paths for above or below grade water management. Refer to your approved plans or AB Spec Book for specific information on these items.


tuyaux de drainage
Vue du fonctionnement du drainage
Options de drainage
Options de drainage

évent écran
évent écran

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