Environmental impact assessment of structural flood mitigation measures in Metro Manila, Philippines using an analytical evidential reasoning approach
نویسندگان
چکیده
The practice of environmental impact assessment (EIA) in the planning processes of infrastructure projects has created significant awareness in many parts of the world on the benefits of environmentally sound and sustainable urban development. In the Philippines, the construction of structural flood mitigation measures (SFMMs) gets high priority from the national government to immediately address the destructive effects of flash floods and inundations in highly urbanized areas, especially in Metro Manila. EIA thus, should be carefully and effectively carried out to maximize the potential benefits that can be derived from SFMMs. An environmental assessment that can be reduced to standardized comparable quantitative values may aid flood managers and decisionmakers in planning for effective and environmentally sound structural flood mitigation projects. This study proposes a semi-quantitative approach to EIA using the rapid impact assessment matrix (RIAM) technique, coupled with evidential reasoning approach, to rationally and systematically aggregate the ecological and socio-economic impacts of 4 planned SFMM projects (2 river channel improvements and 2 new open channels) in Metro Manila. Based on the results, the environmental benefits from the river channel improvements and new open channels generally outweigh the likely negative impacts. The utility values also imply that the river channel improvements will yield higher environmental benefits over the 2 new open channels. The results of this study thus, provide valuable insights for the development of environmental impact assessment process for SFMMs in the Philippines.
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