Description: Stormwater attenuation tanks constructed using modular plastic geocellular units are commonly used as part of sustainable drainage and rainwater reuse systems. This guidance discusses the different type of unit that are available and the differences in their structural performance. It provides information on many full scale trials that have been carried out on various systems and gives a detailed assessment of the factors that affect their structural performance. It also includes guidance on appropriate testing and structural design together with a discussion of the practical issues that should be considered during construction.

There is wealth of information now available about the performance of plastic geocellular tanks. Those that are designed and constructed in accordance with normal structural and geotechnical principles should provide a safe and durable solution for storage of stormwater below ground.

NOTE: Stormwater Management Ltd SUDS systems were included the Structural design of modular geocellular drainage tanks research study (C680).