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An Analysis of Direct Inflow at Agricultural Reservoir During Flood Season

  • Crisisonomy
  • Abbr : KRCEM
  • 2019, 15(12), pp.97-107
  • DOI : 10.14251/crisisonomy.2019.15.12.97
  • Publisher : Crisis and Emergency Management: Theory and Praxis
  • Research Area : Social Science > Public Policy > Public Policy in general
  • Received : October 21, 2019
  • Accepted : November 22, 2019
  • Published : December 31, 2019

Ki Won Lee 1,  Hyunsuk Lee 2,  Hyung-Jin Shin 3,  Maeng, Seung-jin 4

1전북대학교
2
3한국농어촌공사
4충북대학교

Accredited

ABSTRACT

In this study, runoff was investigated in Beodeul agricultural reservoir during flood season. The precipitation and evaporation data collected from Yanggam weather station were utilized, while the inflow was estimated based on discharge and area ratio of the two investigatable streams in the reservoir basin. The two streams, whose catchment area was 71% of total basin, were categorized into stream-① and stream-② according to inflow direction. Surface velocity was measured by a non-contact radar current meter. The surface velocity of the stream-① was corrected by 0.65 as an average velocity conversion coefficient obtained by the three-point velocity method, whereas the surface velocity of the stream-② was corrected by 0.325 as a correction factor. The rate of direct runoff to the reservoir was estimated at 18.5% of the rainfall in the catchment areas of the two streams, and the inflow ratio through the two streams was 22.6%. Despite many assumptions behind these estimates, the inflow rate considering the area ratio was found overestimated by 22.5%. One of the main reasons of the difference between inflow and direct runoff was found to be a low reliability of the 'surface velocity correction factor'.

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