Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Estiamtion of Groundwater Recharge Rate Using the NRCS-CN and the Baseflow Separation Methods

NRCS-CN방법과 기저유출 분리법을 이용한 지하수함양률 산정

  • Bae Sang-Keun (Department of Civil Engineering, Keimyung University) ;
  • Kim Yong-Ho (Department of Civil Engineering, Keimyung University)
  • 배상근 (계명대학교 토목공학과) ;
  • 김용호 (계명대학교 토목공학과)
  • Published : 2006.03.01
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Abstract

Groundwater recharge from precipitation is affected by the infiltration from ground surface and the movement of soil water. Groundwater recharge is directly related to the groundwater amount and flow in aquifers, and baseflow to rivers. Determining groundwater recharge rate for a given watershed is a prerequisite to estimate sustainable groundwater resources. The estimation of groundwater recharge rate were carried out for three subwatersheds in the Wicheon watershed and two subwatersheds in the Pyungchang River basin and for the period 1990-2000, using the NRCS-CN method and the baseflow separation method. The recharge rate estimates were compared to each other. The result of estimation by the NRCS-CN method shows the average annual recharge rate 15.4-17.0% in the Wicheon watershed and 26.4-26.8% in the Pyungchang River basin. The average annual recharge rates calculated by the baseflow separation method ranged 15.1-21.1% in the W icheon watershed, and 25.2-33.4% in the Pyungchang River basin. The average annual recharge rates calculated by the NRCS-CN method is less variable than the baseflow separation method. However, the average annual recharge rates obtained from the two methods are not very different, except NO. 6 subwatershed in Pyungchang River basin.

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References

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