INTRODUCTION Road accidents involving the release of toxic or hazardous materials (such as hydrocarbons and chlorinated solvents, which are non-aqueous phase liquids or NAPL) during their transportation may cause severe environmental problems. A particular attention is given to denser than water NAPLs (DNAPLs), which may reach deep into the aquifer and thus durably contaminate the groundwater. This study is concerned with the impact of a DNAPL spill on the water resource for a road project infringing a zone of drinking water catchments in the case of a road accident involving a DNAPL transporting vehicle. The zone of study spans over several kilometers, along which soil properties vary significantly. Simulation metamodelling is based on the substitution of the simulation model by an approximation of the input–output relationship. Metamodelling, first proposed by Blanning, makes the computations much faster, allowing for more cases to be studied. Originally based
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