In this study, groundwater flow was analyzed targeting Dae-jeong watershed, which exhibited the largest variations of groundwater levels at the identical elevation points among the 16 watersheds of Jeju Island. The issues of the methods applied in practice were identified and improvement plans were suggested. This groundwater-flow estimates derived by applying hydraulic conductivity values onto zones of equal topographic ground level were found to be quite different from actual measured groundwater flow. Conversely, groundwater-flow estimates that utilized hydraulic conductivity values applied onto groundwater-level equipotential lines indicated relatively lesser divergences from actual measured groundwater flow. The reliabilities of the two approaches were assessed for 60 randomly selected points on DEM (digital elevation model) maps, The method using hydraulic conductivity values applied onto groundwater-level contours turned out to be the more reliable approach for the Dae-jeong watershed in Jeju Island.

Abstract
 1. 서 론
 2. 연구 방법
  2.1. 지하수 관측망 현황 및 등수위선 작성
  2.2. 지하수 모형구축
  2.3. 수리전도도 적용을 위한 유역분할
 3. 결과 및 고찰
  3.1. 동 ․서부지역 동일 표고에 대한 수위비교
  3.2. 표고경계에 따른 지하수 흐름분석
  3.3. 등수위선경계에 따른 지하수 흐름분석
  3.4. 미계측지역에 대한 지하수위 검정
 4. 결 론
 REFERENCES

• 박재규(한국농어촌공사, Korea Rural Community Corporation) | Jae-Kyu Park
• 김민철(제주대학교 토목공학과, Department of Civil Engineering, Jeju National University) | Min-Chul Kim
• 양성기(제주대학교 토목공학과, Department of Civil Engineering, Jeju National University) | Sung-Kee Yang Corresponding author
• 이준호(제주대학교 토목공학과, Department of Civil Engineering, Jeju National University) | Jun-ho Lee
• 김용석(제주대학교 토목공학과, Department of Civil Engineering, Jeju National University) | Yong-Seok Kim