DESIGN FREQUENCY DECISION FOR HYDRAULIC STRUCTURES DUE TO HEAVY STORM

다국어 초록 (Multilingual Abstract)

In considering the causes for the damage of winds and floods in Korea. there are two types. that is one of two reasons is known the shape of geomorphology and weather conditionas which are natural factors, the other is social factors that are due to increasing population, industrialization, urbanization and development of rivers. But in recently years according to destroy the global environment by human activity, weather conditions may be changed from expecting conditions to extraordinarty patterns such as Elni? and Lanina. As the result, there are much precipitation beyond the expecting values of annual recording data. When a heavy storm rainfall falls down much amount at a given watersheds area during short interval time, it may happen that inundation of rivers. destruction of banks and ruins of reservoirs. As the results, the damages bring a submersion of farm lands. farm lands of washing away by the floods and burying farm lands by floods. After the analyses of rainfall data including recent data of six points in Han River watershed such as Chunchon, Gapyeong and others. we must restablish the safety factors of river banks and probability exceedence rainfall with each return period for hydraulic structures such as river banks, reservoirs. inflowing weirs etc. in order to overwhelm the risk of agricultural hydraulic structures.
The analysis metod that was chosen is the Extreme Type I and it is gotten the probability rainfalls of during 31 years except missing data.