A B S T R AC TThe amount of non-point pollutants discharged into rivers is greater in urban regions than forests and farmlands due to a higher population density and a larger impermeable area. The analysis and research of non-point pollution in urban areas have been focused upon monitoring the basin outlets, and estimating the environmental loads as well as the unit load. However, the estimation based on the measurements of a single representative spot in the large basin is often calculated, compared to the measurements based on the area and the land use. A less credible method to estimate the load cannot be effectively used in quantifying the non-point pollutant loads caused by the individual land uses. Therefore a method that segments the basin according to the land use in the urban region is required. This is the key to a credible quantifi ed analysis of non-point pollutant loads and enables a rational and scientifi c estimation of signifi cance, cut rate, and establishing reduction plans. The goal of this research was to estimate the load with segmenting the urban region into different sections based on the land use and constructing a model that refl ects the traits of each section. The data was compiled by observations of the Busan City separated into residential districts, business districts, industrial districts, and greens. SWMM was used to simulate the target area, while attempts to compare it with prior researches were made to evaluate the validity and applicability of this research and to ensure its credibility.

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Variation of the urban functions on complex underground space development and increasing demand, and due to heavy rainfall caused by climate changing, flooding in complex underground space into a situation where the possibility of more increases to minimize flood damage in underground space for various requires measure to prevent flooding. In order to establish the optimal protect against flooding, a study uses the hydraulic and numerical model experiments, and each inundation measures the flow characteristics in an underground space required for the research and studies in a Korea, however, it has been little. In this study, the risk of flooding underground space in the presence of EPA SWMM model basin runoff analysis to build up complex underground space and the results were applied at a flow rate on flooding. Not only the study calculated the experimental value every scenario through checking whether there is storage facility or not, the installation of the sand bag and barrier wall by making the underground space of special building which mainly affected by the quantity of runoff in the object basin into hydraulic model, but also tried to analyze the flooding tendency of the underground by figuring out water level change of the Inundation.