Abstract
The implementation of stormwater Best Management Practices (BMPs) could help re-establish the natural hydrological cycle of watersheds after urbanization, with each BMP presenting a different performance across a range of criteria (flood prevention, pollutant removal, etc.). Additionally, conflicting views from the relevant stakeholders may arise, resulting in a complex selection process. This paper proposes a methodology for BMP selection based on the application of multi-criteria decision aid (MCDA) methods, integrating multiple stakeholder priorities and BMP combinations. First, in the problem definition, the MCDA methods, relevant criteria and design guidelines are selected. Next, information from the preliminary analysis of the watershed is used to obtain a list of relevant BMPs. The third step comprises the watershed modeling and analysis of the BMP alternatives to obtain performance values across purely objective criteria. Afterwards, a stakeholder analysis based on survey applications is carried out to obtain social performance values and criteria priorities. Then, the MCDA methods are applied to obtain the final BMP rankings. The last step considers the sensitivity analysis and rank comparisons in order to draw the final conclusions and recommendations. Future improvements to the methodology could explore inclusion of multiple objective analysis, and alternative means for obtaining social performance values.
Highlights
The disturbance of natural landscapes, as a result of urbanization, has direct impacts on the hydrological cycle and water quality, disrupting processes like infiltration, interception, among others.The traditional stormwater management approach based on peak runoff discharge further deteriorates the cycle and the receiving water bodies [1]
Organization Method for Enrichment of Evaluation (PROMETHEE) II, which is often considered a simpler alternative to ELECTRE [15]
A methodology based on multi-criteria decision aid (MCDA) methods was proposed to help decision makers address the situation, seeking solutions under a sustainable development paradigm
Summary
The disturbance of natural landscapes, as a result of urbanization, has direct impacts on the hydrological cycle and water quality, disrupting processes like infiltration, interception, among others.The traditional stormwater management approach based on peak runoff discharge further deteriorates the cycle and the receiving water bodies [1]. The disturbance of natural landscapes, as a result of urbanization, has direct impacts on the hydrological cycle and water quality, disrupting processes like infiltration, interception, among others. The implementation of Best Management Practices (BMPs), like rain gardens, detention ponds and green roofs, aims to mitigate these negative effects, trying to mimic as much as possible the natural hydrology of the watershed, while treating a wide range of pollutants through physical, chemical and biological processes [2]. BMPs vary significantly in performance across different criteria, including the level of water quantity and quality control provided, their physical constraints, the economic costs, and even social perception. As such, their selection process in a given watershed becomes a fairly complicated process. The stakeholders involved in land-development projects could present different views and priorities, adding to the complexity of the situation
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