In this study, we calculated the fixed-type Areal Reduction Factor (ARF) of the Hancheon River basin in Jeju Island, and compared the calculated ARF and the ARF of the four major river basins suggested by the Ministry of Land, Infrastructure and Transport. As a result, the maximum fluctuation ratios of ARF for the four major river basins calculated using area, frequency, and initial duration time were significant: 7.61% for the Hangang River basin; 12.69% for the Nakdonggang River basin; 8.09% for the Kumgang River basin; and 17.98% for the Yeongsangang River basin. In addition, the differences between the maximum and minimum value of ARF for the Hancheon River basin based on 48 hours was 2.13%, and it was smaller than the one for the four major river basins: 8.92% for the Hangang River basin; 11.41% for the Nakdonggang River basin; 8.87% for the Kumgang River basin; and 17.17% for the Yeongsangang River basin. The Yeongsangang River basin had the highest difference.

Abstract
 1. 서 론
 2. 자료 및 방법
  2.1. 면적감소계수 산정절차
  2.2. Thiessen망도 작성 및 강우관측소 선정
  2.3. 강우량 자료의 구축 및 임의시간 연최대치자료계열 작성
  2.4. 지점확률강우량 및 면적확률강우량 산정
 3. 결과 및 고찰
  3.1. 면적감소계수 산정 및 4대강 유역의 면적감소계수의비교
 4. 결 론
 감사의 글
 REFERENCES

• 강명수(제주대학교 토목해양공학과) | Myung-Soo Kang
• 양성기(제주대학교 토목해양공학과) | Sung-Kee Yang Corresponding author
• 김용석(제주대학교 토목해양공학과) | Young-seok Kim
• 강보성(제주대학교 토목해양공학과) | Bo-Seong Kang
• 양세창(제주특별자치도의회) | Se-Chang Yang