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http://dx.doi.org/10.14249/eia.2018.27.3.251

Water Quality Modelling of Flood Control Dam by HSPF and EFDC  

Lee, Young-Gi (Waterfronts & Environment Dept., K-water)
Hwang, Sang-Chul (Business Research & Planning Dept., K-water)
Hwang, Hyun-Dong (HumanPlanet Co.)
Na, Jin-Young (Business Research & Planning Dept., K-water)
Yu, Na-Young (HumanPlanet Co.)
Lee, Han-Jin (Business Research & Planning Dept., K-water)
Publication Information
Journal of Environmental Impact Assessment / v.27, no.3, 2018 , pp. 251-266 More about this Journal
Abstract
This study predicted the effect of operation pattern of flood control dam on water quality. Flood control dam temporarily impound floodwaters and then release them under control to the river below the dam preventing the river ecosystem from the extreme flood. The Hydrological Simulation Program Fortran (HSPF) and the Environmental Fluid Dynamics Code (EFDC) were adapted to predict the water quality before and after the dam construction in the proposed reservoir. The non-point pollutant delivery load from the river basin was estimated using the HSPF, and the EFDC was used to predict the water quality using the provided watershed boundary conditions from the HSPF. As a result of water quality simulation, it is predicted that the water quality will be improved due to the decrease of pollution source due to submergence after dam construction and temporary storage during rainfall. There would be no major water quality issues such as the eutrophication in the reservoir since the dam would impound the floodwater for a short time (2~3 days). In the environmental impact assessment stage of a planned dam, there may be some limitations to the exact simulation because the model can not be sufficiently calibrated. However, if the reliability of the model is improved through the acquisition of actual data in the future, it will be possible to examine the influence of the water environment according to various operating conditions in the environmental impact assessment of the new flood control dam.
Keywords
Flood Control Dam; HSPF; EFDC; Grid Generator;
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