APPLICATION OF ANALYTIC HIERARCHY PROCESS (AHP) FOR SELECTING STORMWATER BEST MANAGEMENT PRACTICES

Green roof and rain garden are the Best Management Practices
(BMPs) that have limited applicability in Malaysia. With the aim
to promote their usability, this paper presents the application of
the Analytic Hierarchy Process (AHP) to select the best type of
these two BMPs. The methodology used is twofold. First, the
feedback on factors influencing the selection of the BMPs was
collected, while in the second stage, respondents were asked to
evaluate the BMP’s alternatives using AHP pairwise comparison
questionnaire. Construction cost is the most influencing factor in
the selection of green roof, with a total priority weight of 0.5013,
followed by the lack of awareness and knowledge (0.1152), and
maintenance complexity (0.0951). Meanwhile, the selection of
rain garden is mainly influenced by the climatic factor (0.2718),
followed by the structural criteria (0.1564) and additional cost
(0.1547). An intensive green roof and permeable rain garden are
selected as the most appropriate type for Malaysian
implementation with composite priorities of 0.848 and 0.752,
respectively.