Rainfall Effects on Discharged Pollution Load in Unit Watershed Area for the Management of TMDLs

수질오염총량관리 배출부하량에 대한 강우영향 분석연구

  • Park, Jun Dae (Water Pollution Cap System Research Division, Water Environmental Research Department, National Institute of Environmental Research) ;
  • Oh, Seung Young (Water Pollution Cap System Research Division, Water Environmental Research Department, National Institute of Environmental Research)
  • 박준대 (국립환경과학원 물환경연구부 수질총량연구과) ;
  • 오승영 (국립환경과학원 물환경연구부 수질총량연구과)
  • Received : 2010.03.31
  • Accepted : 2010.05.04
  • Published : 2010.07.30

Abstract

Discharged pollution load for the management of Total Maximum Daily Loads (TMDLs) is calculated on the basis of rainfall data for reference year. Rainfall has an influence on discharged pollution load in unit watershed with combined sewer system. This study reviewed the status of discharged pollution load and rainfall conditions. We also investigated rainfall effects on discharged pollution load by analyzing change of the load in accordance with increase of rainfall. The change ratio of discharged pollution load was 18.6% while inflow load only 5.8% for 5 years from 2004 to 2008 in Daejeon district. The greatest rainfall and rain days were over 2 times than the least during the period. This change in rainfall could have great effect on discharged pollution load. The analysis showed that discharged pollution load increased 2.1 times in case rainfall increased 2 times and 1.2 times in case rain days increased 2 times. Rainfall effects, therefore, should be considered to make resonable evaluation of discharged pollution load in the assessment of annual performances.

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