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Hydrologic Safety Evaluation of Small Scale Reservoir by Simplified Assesment Method

간편법에 의한 소규모저수지의 수문학적 안전성 평가

  • 이주헌 (중부대학교 토목공학과) ;
  • 양승만 (중부대학교 대학원 토목공학과) ;
  • 김성준 (건국대학교 사회환경시스템공학과) ;
  • 강부식 (단국대학교 토목환경공학과)
  • Received : 2010.10.26
  • Accepted : 2011.02.09
  • Published : 2011.03.31

Abstract

Based on the statistical annual report, there are 17,649 reservoirs are operating for the purpose of agricultural water supply in Korea. 58 % of entire agricultural reservoirs had been constructed before 1948 which indicate the termination of required service life and rest of those reservoirs have also exposed to the dam break risk by extreme flood event caused by current ongoing climate change. To prevent damages from dam failure accident of these risky small size dams, it is necessary to evaluate and manage the structural and hydrological safety of the reservoirs. In this study, a simplified evaluation method for hydrologic safety of dam is suggested by using Rational and Creager formula. Hydrologic safety of small scale dams has evaluated by calculating flood discharge capacity of the spillway and compares the results with design frequency of each reservoir. Applicability and stability of suggested simplified method have examined and reviewd by comparing the results from rainfall-runoff modeling with dam break simulation using HEC-HMS. Application results of developed methodology for three sample reservoirs show that simplified assessment method tends to calculate greater inflow to the reservoirs then HEC-HMS model which lead lowered hydrologic safety of reservoirs. Based on the results of application, it is expected that the developed methodology can be adapted as useful tool for small scale reservoir's hydrologic safety evaluation.

Keywords

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