The increase of localized heavy rains due to climate change and the increase of impervious area due to urbanization caused a sudden increase in rainfall-runoff in urban areas, resulting in an increase in human life and property damage caused by floods. Therefore, in order to prevent urban flooding, ...
The increase of localized heavy rains due to climate change and the increase of impervious area due to urbanization caused a sudden increase in rainfall-runoff in urban areas, resulting in an increase in human life and property damage caused by floods. Therefore, in order to prevent urban flooding, it is important to prepare improvement measures to minimize the possibility of future flood damage through analysis of rainfall data and accurate diagnosis of current sewer pipe system. This study examines the possibility of flooding in the future due to changes in conditions including housing redevelopment, road construction, and enlargement of sewer pipes in areas where flooding has occurred in the past. XP-SWMM(Storm Water Management Model developed by XP Software Inc.), a two-dimensional modeling program, was selected to analyze the causes of flooding in the past and the ability to cope with flooding in the improved current sewer system. XP-SWMM can estimate the amount of rainfall-runoff in urban drainage basin and analyze the water quantity and water quality in the storm pipeline. In addition, the overflows in the sewer system and the backwater effect of the downstream can be considered. Daegu Meteorological Observatory is the dominant station that affects the hydrologic status in the study area. In this study, the rainfall data from this station was used to model the flooding in the study area due to heavy rainfall in 2011, and the results were verified through comparison with observed data. In addition, the possibility of flooding was investigated for the frequency of 30-year and 50-year considering urban redevelopment and sewer system improvement. As a result, in 2011 modeling when actual flooding occurred, the simulation results and actual data showed a good agreement. In simulation considering improvement of urban environment and sewer system, flooding did not occur under 30-year frequency condition, while flooding occurred in some areas under 50-year frequency condition. The cause of flooding in the study area was found to be a lack of water pipeline capacity in some sewer system in the drainage basin. In order to prevent local flooding due to the occurrence of localized heavy rains in the future, it is need to be prepared by expanding the sewer pipe diameter and changing the flow path or designing a low impact development (LID) technique in the area of flooding risk. In urban areas, rainwater is hard to penetrate into the ground due to the increase of impervious surface and it is necessary to solve the distortion of the water cycle caused by rapid urbanization. Therefore, it is necessary to set up countermeasures for the reduction of urban flooding and recovery of water circulation. As a countermeasure, it is necessary to accumulate data step by step after analyzing the adequacy of the current sewer pipeline system and to simulate the two-dimensional modeling in the flooded damage area and the risk area where the damage is likely to occur. In addition, it is necessary to establish long-term measures to protect civil safety and property rights by establishing structural measures such as improvement of sewage system and non-structural measures such as Low Impact Development (LID).
The increase of localized heavy rains due to climate change and the increase of impervious area due to urbanization caused a sudden increase in rainfall-runoff in urban areas, resulting in an increase in human life and property damage caused by floods. Therefore, in order to prevent urban flooding, it is important to prepare improvement measures to minimize the possibility of future flood damage through analysis of rainfall data and accurate diagnosis of current sewer pipe system. This study examines the possibility of flooding in the future due to changes in conditions including housing redevelopment, road construction, and enlargement of sewer pipes in areas where flooding has occurred in the past. XP-SWMM(Storm Water Management Model developed by XP Software Inc.), a two-dimensional modeling program, was selected to analyze the causes of flooding in the past and the ability to cope with flooding in the improved current sewer system. XP-SWMM can estimate the amount of rainfall-runoff in urban drainage basin and analyze the water quantity and water quality in the storm pipeline. In addition, the overflows in the sewer system and the backwater effect of the downstream can be considered. Daegu Meteorological Observatory is the dominant station that affects the hydrologic status in the study area. In this study, the rainfall data from this station was used to model the flooding in the study area due to heavy rainfall in 2011, and the results were verified through comparison with observed data. In addition, the possibility of flooding was investigated for the frequency of 30-year and 50-year considering urban redevelopment and sewer system improvement. As a result, in 2011 modeling when actual flooding occurred, the simulation results and actual data showed a good agreement. In simulation considering improvement of urban environment and sewer system, flooding did not occur under 30-year frequency condition, while flooding occurred in some areas under 50-year frequency condition. The cause of flooding in the study area was found to be a lack of water pipeline capacity in some sewer system in the drainage basin. In order to prevent local flooding due to the occurrence of localized heavy rains in the future, it is need to be prepared by expanding the sewer pipe diameter and changing the flow path or designing a low impact development (LID) technique in the area of flooding risk. In urban areas, rainwater is hard to penetrate into the ground due to the increase of impervious surface and it is necessary to solve the distortion of the water cycle caused by rapid urbanization. Therefore, it is necessary to set up countermeasures for the reduction of urban flooding and recovery of water circulation. As a countermeasure, it is necessary to accumulate data step by step after analyzing the adequacy of the current sewer pipeline system and to simulate the two-dimensional modeling in the flooded damage area and the risk area where the damage is likely to occur. In addition, it is necessary to establish long-term measures to protect civil safety and property rights by establishing structural measures such as improvement of sewage system and non-structural measures such as Low Impact Development (LID).
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