Before constructing your segmented retaining wall, be sure to identify localized water sources such as storm drains and drop structures. Consult with the Project Site Civil Engineer to ensure that water will not be introduced into the reinforced mass.
Also consider excess irrigation or natural groundwater sources. Provisions, such as check valves, to prevent flooding from broken lines or heads must be put in place to stop over irrigation above walls.
Water must drain away from the top and bottom of the wall. To achieve this, swales can be used above the wall. During construction it is also important to assure that surface water doesn’t pond above the wall. At the end of each day water needs to be directed away from the partially constructed wall.
Additional wall rock should be added around all storm drains and drop structures to aid in draining any areas of the pipe that may leak. If there are any utilities within the reinforcement zone, place gravel around them to generate good compaction levels. (ref. BP, Chapter 3.1)
Allan Block is working to achieve our industry initiative of Zero Wall Failures. With our Best Practices Manual and experience in the industry we are trying to expand the knowledge base for the design of segmental retaining walls (SRW's) by communicating and educating the professionals in the industry. To see the full Best Practices Manual, visit allanblock.com to download today and keep an eye out for more industry Best Practice recommendations here.