Integrated Water Resources Management Considering Geologic Features Under Climate Change: Development of an Analytical Tool for Langat River Basin in Malaysia

For integrated water resources management in the Langat River basin in Malaysia, which has water quality problems, we evaluated the water retention function of the forest area from a geological perspective and reflected it in a hydrological analysis model of the basin and analyzed the water resources in the target basin based on climate prediction datasets with representative concentration pathways of greenhouse gases. We also introduced a dedicated tool that stores the analysis results as a database and displays them visually on a GIS. In the analytical modeling, we found that evaluating water retention based on the geological characteristics of granite distributed over the forest area and reflecting it in the modeling contributes to the accurate identification of river discharge, especially during the dry seasons when water pollution becomes apparent. Runoff analysis on datasets with representative concentration pathways RCP2.6 and RCP8.5 for climate change scenarios revealed that the impact of climate change on changes in river flow in the Langat River after 50 years was relatively insignificant.