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The hydrologic response of watershed determined by complex process about climate-soil-vegetation. Evapotranspiration is very important component of hydrological cycle to connect climate, soil and vegetation. The research of annual evapotranspiration the watershed is primary topic for understanding hydrological cycle in watershed. A suitable model for South Korea which relates annual evapotranspiration to precipitation, potential evapotranspiration, and ratio of forest considering vegetation effect, is proposed in this study. Result of the proposed model is not high quality about estimating evapotranspiration but it is better than previous model which relates annual evapotranspiration. This study is able to suggest research direction about dynamic analysis of climate-soil-vegetation.

This paper presents a design method by which the overflow risk related to a detention for managing nonpoint pollutant sources in urban areas can be evaluated. The overall overflow risk of a nonpoint pollutant sources control detention can be estimated by inherent overflow risk and operational overflow risk. For the purpose of calculating overflow risk, the 3-parameter mixed exponential distribution is applied to describe the probability distribution of rainfall event depth. As a rainfall-runoff calculation procedure required for deriving a rainfall capture curve, the U.S. Natural Resources Conservation Service runoff curve number method is applied to consider the nonlinearity of the rainfall-runoff relation. Finally, the detention overflow risk is assessed with respect to the detention design capacity and drainage time. The proposed overflow risk assessment is expected to provide a baseline to determine quantitative parameters in designing a nonpoint sources control detention. Water Environ. Res., 84, 434 (2012).