A proposed decision-making framework for a national infiltration SuDS map

Purpose – The purpose of this paper is to describe the decision‐making framework and datasets behind a national geographical information system (GIS) map that assesses the suitability of the subsurface for infiltration sustainable drainage systems (SuDS). In combination they provide geoenvironmental information on the necessary geological and hydrogeological considerations to facilitate preliminary site assessment.Design/methodology/approach – The national suitability map comprises four parts, each of which considers a geoenvironmental factor essential to SuDS planning, installation and performance. The first three comprise: drainage; ground stability; and pollutant attenuation potential. The final map highlights those areas where infiltration may result in negative consequences such as the initiation or exacerbation of flooding or ground instability.Findings – The application of the suitability map is demonstrated for an urban setting, showing its relevance to both planning for wide spatial‐assessment an...

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