Loading of NPS pollutant was valued through simulation by using BASINS/HSPF model which can simulate runoff volume in rainfall by time. For the verification of the model, it was analyzed the scatter diagram of the simulation value and measure value of water quality and runoff volume in Dongcheon estuary. Using the built model, a study on the time-variant characteristics of runoff and water quality was simulated by being classified into four cases. The result showed the simulation value was nearly same as that of the measured runoff. In the result of fit level test for measured value and simulated value, correlation of runoff volume was computed high by average 0.86 and in the water quality items, fit level of simulation and measurements was high by BOD 0.82, T-N 0.85 and T-P 0.79.

Abstract
 1. 서 론
 2. 자료 및 방법
  2.1. 조사 대상 유역
  2.2. 강우 시 모니터링
  2.3. HSPF 모형 이론
 3. 결과 및 고찰
  3.1. 수질 및 유량 모니터링 결과
  3.2. BASINS/HSPF 모의
 4. 결 론
 참 고 문 헌

• 이재운(국립환경과학원 낙동강물환경연구소) | Jae-Woon Lee (Nakdong River Water Environment Research Center, National Institute of Environmental Research) Corresponding author
• 권헌각(국립환경과학원 낙동강물환경연구소) | Hun-Gak Kwon (Nakdong River Water Environment Research Center, National Institute of Environmental Research)
• 이윤정(국립환경과학원 낙동강물환경연구소) | Youn- Jeong Yi (Nakdong River Water Environment Research Center, National Institute of Environmental Research)
• 윤종수(국립환경과학원 낙동강물환경연구소) | Jong-Su Yoon (Nakdong River Water Environment Research Center, National Institute of Environmental Research)
• 한건연(경북대학교 토목공학과) | Kun-Yeun Han (School of Architectural & Civil Engineering, Kyungpook National University)
• 천세억(국립환경과학원 낙동강물환경연구소) | Se-Uk Cheon (Nakdong River Water Environment Research Center, National Institute of Environmental Research)