A number of projects for development have been done continuously due to the increase of tourist in Jeju Island. However flood disaster countermeasure due to urbanization is not considered during this development projects. This study is to make basic process for the flood estimation in Han stream of Jeju Island. The variation of stream discharge due the every 5 years' land use change from 1980 to 2005. Data for flood events (rainfall and discharge) were collected for HEC-HMS model. Clark method was used for unit hydrograph analysis. For the estimation of Clark unit hydrograph parameters, Kraven II and Sabol’s empirical equations were applied. The peak discharge increased 9.9~33.67% and total discharge amount increased 12.53~30.21%. Also, time of concentration for peak discharge was reduced by 10 minutes for each event.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 연구방법
  2.2. 연구대상 유역
  2.3. 적용 호우사상 및 유역평균강우량
  2.4. 홍수유출량 매개변수 최적화
 3. 결과
  3.1. 토지이용변화 분석
  3.2. 토지이용에 따른 유출계수 산정
  3.3. 토지이용에 따른 유출계수 산정
 4. 결론
 REFERENCE

• 양세창(제주특별자치도의회) | Se-Chang Yang (Jeju Special self-governing provincial council)
• 양성기(제주대학교 토목공학과) | Sung-Kee Yang (Department of Civil Engineering, Jeju National University) Corresponding author
• 이준호(제주대학교 토목공학과) | Jun-Ho Lee (Department of Civil Engineering, Jeju National University)
• 정우열(제주특별자치도의회) | Woo-Yul Jung (Jeju Special self-governing provincial council)
• 고광효(제주대학교 토목공학과) | Kwang-Hyo Ko (Department of Civil Engineering, Jeju National University)