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Journal of Applied Sciences and Environmental Management
World Bank assisted National Agricultural Research Project (NARP) - University of Port Harcourt
ISSN: 1119-8362
Vol. 11, No. 4, 2007, pp. 113-117
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Bioline Code: ja07106
Full paper language: English
Document type: Research Article
Document available free of charge
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Journal of Applied Sciences and Environmental Management, Vol. 11, No. 4, 2007, pp. 113-117
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Evaluation Of Flood Mitigation Alternatives Using Hydrological Modeling
Reza, Ghanbarpour M.
Abstract
Flood damage is one of the most important natural hazards in arid and semi-arid regions. Hydrological
modeling is needed for integrated watershed assessment, determining the effects of upstream watershed disturbances
and flood control measures on flooding. Historical flash floods threatening Kan watershed have shown that flood
control measures are urgently needed to protect natural resources, tourist sites and metropolitans area. Kan watershed
has two sub-basins with common outlet, which is caused accelerated impacts on peak flows and flood volumes in
mainstream. This watershed is a very interesting case for study of synchronized flood hydrographs analysis and
possible challenges for reducing the intensity of floods. In this paper, an event based hydrological model, HEC-HMS,
was used to modeling the watershed response to any changes by structural and non-structural flood control measures
and synchronized hydrograph analysis. A multiple decision-making method was used to find optimal flood mitigation
alternative based on 25 and 100 years peak flood discharges and time lag between peak flood discharges at outlet of
two sub basins. Synchronized hydrograph analyses have shown that flood control measures should not implement in
Kiga sub-basin. For local flood mitigation at the Kiga sub-basin some methods for facilitating the flood flows were
proposed. The analyses showed that magnitudes of the peak discharges downstream could be reduced if upstream
peak flows are desynchronized. In these cases hydrograph analyses play the key role in rational flood mitigation
planning.
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© Copyright 2007 - Journal of Applied Sciences & Environmental Management
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