For the development of flow duration curves for the management of 41 Total Maximum Daily Load (TMDL) units of the Nakdong River basin, first, an equation for estimating daily flow rates as well as the level of correlation (correlation and determination coefficients) was extrapolated through regression analysis of discrete (Ministry of Environment) and continuous (Ministry of Land, Infrastructure and Transportation) measurement data. The equation derived from the analysis was used to estimate daily flow rates in order to develop flow duration curves for each TMDL unit. By using the equation, the annual flow duration curves and flow curves, for the entire period and for each TMDL unit of the basin, were developed to be demonstrated in this research. Standard flow rates (abundant-, ordinary-, low- and drought flows) for major flow duration periods were calculated based on the annual flow duration curves. Then, the flow rates, based on percentile ranks of exceedance probabilities (5, 25, 50, 75, and 95%), were calculated according to the flow duration curves for the entire period and are suggested in this research. These results can be used for feasibility assessment of the set values of primary and secondary standard flow rates for each river system, which are derived from complicated models. In addition, they will also be useful for the process of implementing TMDL management, including evaluation of the target level of water purity based on load duration curves.

Abstract
 1. 서 론
 2. 분석 자료와 방법
  2.1. 연구대상유역
  2.2. 총량관리 유량측정 방법
  2.3. 총량관리 유량자료의 특성
  2.4. 총량관리 유황곡선 작성
  2.5. 총량관리 유황곡선 작성절차
 3. 결과 및 토의
  3.1. 하천 유량측정지점 현황 및 일유량 비교지점 선정
  3.2. 총량관리 단위유역 일유량 추정식
  3.3. 총량관리 유황곡선
 4. 결 론
 REFERENCES

• 김경훈(국립환경과학원 낙동강물환경연구소) | Gyeong hoon Kim (Nakdong River Environment Research Center, National Institute of Environmental Research)
• 권헌각(국립환경과학원 낙동강물환경연구소) | Heon gak Kwon (Nakdong River Environment Research Center, National Institute of Environmental Research)
• 안정민(국립환경과학원 낙동강물환경연구소) | Jung min Ahn (Nakdong River Environment Research Center, National Institute of Environmental Research)
• 김상훈(국립환경과학원 낙동강물환경연구소) | Sanghun Kim (Nakdong River Environment Research Center, National Institute of Environmental Research)
• 임태효(국립환경과학원 낙동강물환경연구소) | Tae hyo Im (Nakdong River Environment Research Center, National Institute of Environmental Research)
• 신동석(국립환경과학원 낙동강물환경연구소) | Dong seok Shin (Nakdong River Environment Research Center, National Institute of Environmental Research)
• 정강영(국립환경과학원 낙동강물환경연구소) | Kang-Young Jung (Nakdong River Environment Research Center, National Institute of Environmental Research) Corresponding author