DECISION AIDS FOR ALTERNATIVE TECHNIQUES IN URBAN STORM MANAGEMENT

The choice of alternative techniques in urban stormwater drainage (inf iltration and detention systems), in the course of a project, is most often made with a poor understanding of site constraints, and the poss ibilities afforded by these techniques. This gives rise to extra costs and also subsequent malfunctioning. To arrive at feasible choices, we have formalised the decision-making process, taking account of the mu ltiple criteria and the large number of partners involved. At present, we are developing a decision-making tool for alternative techniques i n urban stormwater management at the preliminary study stage. The firs t phase makes it possible to eliminate solutions which are unworkable (elimination phase). It is aimed at the designer. Work on the next pha se (the decision-making phase), which is more complex, is in progress. It will make it possible, in collaboration with all the partners invo lved to choose a stormwater drainage strategy which will best suit the objectives and the wishes of the partners. It uses multi-criteria met hods.