Soil water enters the atmosphere via evapotranspiration, where it transforms into atmospheric water vapor and plays important role in the surface-atmosphere energy exchange. Soil conditions have a direct influence on the effective rainfall, and initial soil moisture conditions are important for quantitatively evaluating the effective rainfall in a watershed. To examine the sensitivity of the initial saturation to hydrologic outflow, a two-dimensional distributed FLO-2D hydrologic model was applied to a small watershed. The initial saturation was set to 0.3, 0.5, and 0.7 and the obtained results were compared. The Green-ampt model was chosen to calculate the penetration loss. Depending on the initial soil moisture, the peak flow rate varied by up to 60%, and the total water volume in the watershed by approximately 40%.

Abstract
1. 서 론
2. 연구 지역과 수치모형
    2.1. 연구 지역
    2.2. 수문모형
3. 연구 방법
4. 결과 및 고찰
5. 결 론
REFERENCES

• 이길하(대구대학교 토목공학과) | Lee Khil-Ha (Department of Civil Engineering, Daegu University) Corresponding author