The streams in Jeju Island have very distinctive hydrological and geological properties and there are a lot of limits in applying the general flood estimation method. This study presented parameters dominant in the Hancheon stream of Jeju Island by analyzing the sensitivity of parameters of HEC-HMS model regarding rainfall events in the target basin, and extracted the optimal parameter(Time of Concentration of Clark Unit Hydrograph: KravenⅡ method, Storage Coefficient: Sabol method) by analyzing and comparing it with the flood runoff data observed in the site and Jeju Island's observation data.

Abstract
 1. 서 론
 2. 자료 및 방법
  2.1. 연구방법
  2.2. 연구대상 유역
  2.3. 적용 호우사상 및 유량관측 결과
 3. 결과 및 고찰
  3.1. 매개변수 민감도 분석
  3.2. 매개변수 조합에 따른 홍수유출량 산정
 4. 결 론
 참 고 문 헌

• 정우열(제주대학교 토목공학과) | Woo-Yul Jung (Department of Civil Engineering, Jeju National University)
• 양성기(제주대학교 토목공학과) | Sung-Kee Yang (Department of Civil Engineering, Jeju National University) Corresponding author
• 김동수(단국대학교 토목환경공학과) | Dong-Su Kim (Department of Civil & Environmental Engineering, Dankook University)