To regularise peak storm water flows, a simple underground accumulation and infiltration chamber can be constructed by burying a volume of expanded clay, suitably contained within a geotextile or geomembrane.
Thanks to the inherent strength of the expanded clay there is no need for a complex covering structure. The ground layers above the reservoir can bear directly on the expanded clay and can take the load of any type of activity (parking, roads, sports grounds, gardens, etc.).
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