The objective of this study is to provide pollutant loads delivery ratio for flow duration in Oenam-cheon watershed, which is upstream watershed of Juam Lake. To calculate the delivery ratio by flow duration, rating curves and discharge-loads curves using measured data were established, then Flow Duration Curve(FDC) and pollutant loads delivery ratio curves were constructed. The results show that the delivery ratios for BOD5 for abundant flow(Q95), ordinary flow(Q185), low flow(Q275), and drought flow(Q355) were 23.9, 12.7, 7.1, and 2.9%, respectively. The delivery ratios of same flow regime for T-N were 58.4, 31.2, 17.2 and 7.1%, respectively. While, the delivery ratios T-P were 17.3, 7.5, 3.4, and 1.1% respectively. In general, delivery ratio of high flow condition showed higher value due to the influence of nonpoint source pollution. Based on the study results, generalized equations were developed for delivery ratio and discharge per unit area, which could be used for ungaged watershed with similar pollution sources.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 유역 현황
  2.2. 강우량 및 수문조사
  2.3. 오염원 발생, 배출, 유달부하량
  2.4. 유량-유황곡선
  2.5. 유량-유달부하량
  2.6. 유달율 산정방법
 3. 결과 및 고찰
  3.1. 수문조사결과
  3.2. 오염원 현황 및 발생 및 배출부하량
  3.3. 유량-유황곡선
  3.4. 유량-부하량 관계곡선식
  3.5. 유황별 유달율
  3.6. 유량-유달율 회귀식 개발
 4. 결 론
 참 고 문 헌

• 최동호(전남대학교 지역바이오시스템공학과) | Dong-Ho Choi (Department of Rural & Bio-Systems Engineering, Chonnam National University)
• 정재운(국립환경과학원 영산강물환경연구소) | Jae-Woon Jung (Yeongsan River Environment Research Laboratory, National Institute of Environmental Research)
• 이경숙(전남대학교 지역바이오시스템공학과) | Kyoung-Sook Lee (Department of Rural & Bio-Systems Engineering, Chonnam National University)
• 최유진(국립환경과학원 수질총량관리센터) | Yu-Jin Choi (National Institute of Environment Research, Water Pollution Cap System Division)
• 윤광식(전남대학교 지역바이오시스템공학과) | Kwang-Sik Yoon (Department of Rural & Bio-Systems Engineering, Chonnam National University) Corresponding author
• 조소현(국립환경과학원 영산강물환경연구소) | So-Hyun Cho (Yeongsan River Environment Research Laboratory, National Institute of Environmental Research)
• 박하나(국립환경과학원 영산강물환경연구소) | Ha-Na Park (Yeongsan River Environment Research Laboratory, National Institute of Environmental Research)
• 임병진(국립환경과학원 영산강물환경연구소) | Byung-Jin Lim (Yeongsan River Environment Research Laboratory, National Institute of Environmental Research)
• 장남익(국립환경과학원 기후대기연구부 대기환경연구과) | Nam-Ik Chang (National Institute of Environment Research, Air Quality Research Division)