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Estimation of Runoff Curve Number for Agricultural Reservoir Watershed Using Hydrologic Monitoring and Water Balance Method

수문모니터링과 물수지법을 이용한 농업용 저수지 유역 유출곡선번호 추정

  • 윤광식 (전남대학교 농업생명과학대학(농업과학기술연구소)) ;
  • 김영주 (전남대학교 농업생명과학대학(농업과학기술연구소)) ;
  • 윤석군 (전남대학교 대학원) ;
  • 정재운 (전남대학교 대학원) ;
  • 한국헌 (농업과학기술원 환경생태과)
  • Published : 2005.05.01

Abstract

The rainfall-runoff potential of Jangseong reservoir watershed was studied based on SCS (Soil Conservation Service, which is now the NRCS, Natural Resources Conservation Service, USDA) runoff curve number (CN) technique. Precipitation and reservoir operation data had been collected. The rainfall-runoff pairs from the watershed for ten years was estimated using reservoir water balance analysis using reservoir operation records. The maximum retention, S, for each storm event from rainfall-runoff pair was estimated for selected storm events. The estimated S values were arranged in descending order, then its probability distribution was determined as log-normal distribution, and associated CNs were found about probability levels of Pr=0.1, 0.5, and 0.9, respectively. A subwatershed that has the similar portions of land use categories to the whole watershed of Jangseong reservoir was selected and hydrologic monitoring was conducted. CNs for subwatershed were determined using observed data. CNs determined from observed rainfall-runoff data and reservoir water balance analysis were compared to the suggested CNs by the method of SCS-NEH4. The $CN_{II}$ measured and estimated from water balance analysis in this study were 78.0 and 78.1, respectively. However, the $CN_{II}$, which was determined based on hydrologic soil group, land use, was 67.2 indicating that actual runoff potential of Jangseong reservoir watershed is higher than that evaluated by SCS-NEH4 method. The results showed that watershed runoff potential for large scale agricultural reservoirs needs to be examined for efficient management of water resources and flood prevention.

Keywords

References

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