The purpose of this study at water quality pollutants to propose proper management method for the Osu-A unit watershed which is the influent tributary located upstream of the Sumjin -river among the 13 unit watersheds in the Sumjin-river water system. Analyzed the correlation between flow-pollution loading and the correlation between land use type, BOD and TP items, and analyzed 8-day intervals Cumulative Flow Duration Curve (CFDC) and Load Duration Curve (LDC) to evaluate water quality damage. As a result, both BOD and TP were larger than 1 and the concentration of water pollutants increased with increasing flow. BOD was positively correlated with Urban and Field, and TP was positively correlated with Field with 0.710. As a result of the LDC, BOD was analyzed that the target water quality was achieved with the excess rate of less than 50%, and TP exceeded the target water quality by 50.1%. BOD usually exceeded the standard value (exceedance probability 50%) at low flow zone and On the other hand, TP usually exceeded the standard value at high flow zone. Monthly BOD (April to June) and TP (May to August) exceeded the standard. Sewage Wastewater treatment and non-point pollution control is Osu-A unit watersheds are effective in improving BOD and TP.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 연구대상 유역 및 자료수집
  2.2. 유량-부하량 관계식
  2.3. 토지 이용 분석
  2.4. 유량지속곡선
  2.5. 부하지속곡선
 3. 결과 및 고찰
  3.1. 강우량과 수질조사
  3.2. 오염원 현황과 발생 및 배출부하량 조사
  3.3. 유량-오염부하량 상관분석 결과
  3.4. 토지이용과 수질항목별 상관분석
  3.5. 8일 간격 누적유량지속곡선 작성결과
  3.6. 부하지속곡선 작성 및 실측 자료 도식화 결과
  3.7. 누적유량빈도 그룹 및 월별 수체 손상도 분석
 4. 결 론
 REFERENCES

• 이영성(국립환경과학원 영산강물환경연구소) | Young Sung Lee (Yeongsan River Environment Research Center, National Institute of Environmental Research)
• 김영석(국립환경과학원 영산강물환경연구소) | Young Suk Kim (Yeongsan River Environment Research Center, National Institute of Environmental Research)
• 한성욱(국립환경과학원 영산강물환경연구소) | Sung Wook Han (Yeongsan River Environment Research Center, National Institute of Environmental Research)
• 서권옥(국립환경과학원 영산강물환경연구소) | kwon ok Seo (Yeongsan River Environment Research Center, National Institute of Environmental Research)
• 임창복(국립환경과학원 영산강물환경연구소) | chang bok Lim (Yeongsan River Environment Research Center, National Institute of Environmental Research)
• 이영재(국립환경과학원 영산강물환경연구소) | Yeong Jae Lee (Yeongsan River Environment Research Center, National Institute of Environmental Research)
• 김경현(국립환경과학원 영산강물환경연구소) | Kyunghyun Kim (Yeongsan River Environment Research Center, National Institute of Environmental Research)
• 정강영(국립환경과학원 영산강물환경연구소) | Kang-Young Jung (Yeongsan River Environment Research Center, National Institute of Environmental Research) Corresponding author