In recent years, the United States has used the Load Duration Curve (LDC) method to identify water pollution problems, considering the size of the pollutant load in the entire stream flow condition to effectively evaluate Total Maximum Daily Loads (TMDLs). A study on the improvement of the target water quality evaluation method was carried out by comparing evaluations of two consecutive years of water quality and LDC data for 41 unit watersheds (14 main streams and 27 tributaries). As a result, the achievement rate of the target water quality evaluation method, according to current regulations, was 68-93%, and that by the LDC method was 82-93%. Evaluating the target water quality using the LDC method results in a reduction in the administrative burden and the total amount of planning as compared to the current method.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 연구대상유역
  2.2. BOD, T-P 및 유량 자료
  2.3. 목표수질 평가방법
 3. 결과 및 토의
  3.1. 적용결과
  3.2. 평가방법별 결과비교
 4. 결 론
 REFERENCES

• 정강영(국립환경과학원 낙동강물환경연구소) | Kang-Young Jung (Nakdong River Environment Research Center, National Institute of Environmental Research)
• 김홍태(국립환경과학원 유역총량연구과) | Hong Tae Kim (Watershed Pollution Load Management Research Division, National Institute of Environmental Research)
• 김상수(국립환경과학원 유역총량연구과) | Sang Soo Kim (Watershed Pollution Load Management Research Division, National Institute of Environmental Research)
• 김신(국립환경과학원 낙동강물환경연구소) | Shin Kim (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)
• 김경훈(국립환경과학원 낙동강물환경연구소) | Gyeong Hoon Kim (Nakdong River Environment Research Center, National Institute of Environmental Research) Corresponding author