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Variation of water supply for instream flow from reservoirs with various magnifications of paddy irrigation area to watershed area

유역배율에 따른 저수지의 하천유지용수 공급량

  • Noh, Jae-Kyoung (Dept. of Agricultural and Rural Engineering, Chungnam National University) ;
  • Lee, Jae-Nam (Dept. of Agricultural Engineering, Chungnam National University)
  • 노재경 (충남대학교 지역환경토목학과) ;
  • 이재남 (충남대학교 대학원 농공학과)
  • Received : 2011.05.06
  • Accepted : 2011.06.20
  • Published : 2011.06.30

Abstract

To provide variation of water supply for instream flow from reservoirs with various magnifications of paddy irrigation area to watershed area, 8 reservoirs were selected to draw operation rule curve and to analyze water supplies from reservoirs. Reliability of 90% for supplying irrigation water from reservoir was able to maintain and instream flow water was able to be supplied only in the reservoir with magnification of paddy irrigation area to watershed area above 3. The more magnification of paddy irrigation area to watershed area increased, the more ratio of irrigation water to total water storage decreased, and the more ratio of instream flow water to total water storage increased. From the heightening 113 reservoirs in Korea, annual irrigation water was estimated to 1,146.05 $Mm^3$ in normal operation, 839.57 $Mm^3$ in withdrawal limited operation, and annual instream flow water was estimated to 149.68 $Mm^3$ in normal operation, 283.19 $Mm^3$ in withdrawal limited operation. It was concluded that withdrawal limited operation was followed to have the premise of saving irrigation water, more instream flow water was able to be supplied from reservoirs with high magnification of paddy irrigation area to watershed area.

Keywords

References

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