Failed or collapsed landscape Retaining walls are generally caused by failure to consider and implement suitable footings and drainage during design and construction. Brisbane’s 2011 extensive wet season and subsequent flooding highlighted these problems to many home owners. In many cases affected walls had little or no drainage behind walls to assist with alleviating water build up. While appropriate structural footings for retaining walls should never be overlooked, efficient drainage and appropriate back fill for retaining walls should be considered as important as the retaining wall structure itself. With Modern house allotments limiting site access for future repairs / replacement, it is imperative to build a durable retaining wall. Visit Brisbane Landscapers Instant Greenscene landscaping for more information.