Introduction of decision support system for design of LID based on SWMM5.1: A case study in Korea

Climate change, urbanization, and land use change influences the urban environmental compositions and eventually occurs water related problems such as flood, drought, and water quality deterioration. Recently, Low Impact Development (LID) techniques, which can be effective alternatives to river rehabilitation, have been introduced and EPA SWMM has also developed an innovative LID control module that involves with infrastructure practices. However, the LID control module should be repeatedly simulated to develop the detailed design concept. Therefore, Water Management Analysis Module (WMAM), an effective decision support system (DSS) based on EPA SWMM5.1 for LID designing and planning was developed. In this study, the developed WMAM is applied to a case study in Korea to show the effectiveness and usefulness of it. WMAM can simulate multiple-scenarios of water management facilities as well as design and planning parameters, simultaneously, in a selected sub-catchment. By using its sensitivity analysis, it finds several powerful parameters among various LID design parameters. Moreover, it generates and simulates multiple scenarios of the watershed management facility’s design and planning parameters, and it provides the most effective scenario for LID design and planning parameters in the hydrologic aspect. It was found that this DSS provides a better detailed design concept among various plausible LID options for water cycle rehabilitation.