A Multi-criteria Decision-making Approach for Characterizing the Best Low Impact Development (LID) Techniques for Stormwater Management
Keywords:multi-criteria decision analysis (MCDA), green roof, bioretention, stormwater
Low impact development (LID) techniques are known as a novel stormwater management approach designed to mitigate the adverse effects of stormwater runoff and nonpoint source pollution. This study proposes a methodology for selecting the best LIDs based on multi-criteria decision analysis (MCDA) while incorporating different stakeholder priorities. The proposed methodology comprises analysis of alternatives, stakeholder analysis, and application of the MCDA methods. The results show that most LID techniques received ratings of more than three from the Weighted Average Method (WAM; performing well) other than green roofs and constructed filters, and no techniques averaged lower than 2.29 out of five. There is a general consensus on how vegetated filter strips and infiltration practices would perform, while there is little consensus on bioretention, level spreaders, and porous pavements. The ratings show that the majority of stakeholders thought most LIDs would perform well (a rating of more than three). The findings of this study provide an initial insight into how to support effective and widespread LID implementation for all decision-makers such as planners, designers, engineers, and stormwater managers.