Vol 7, No 7 (2016) > Civil Engineering >

An Assessment of Flood Hazard and Risk Zoning in the Lower Nam Phong River Basin, Thailand

Kittiwet Kuntiyawichai, Quan Van Dau, Winai Sri-Amporn, Fransiscus Xaverius Suryadi


Abstract: Rapid socio-economic
development along with exceptional rainfall can potentially exacerbate risk of
flood damage to life and property in the lower Nam Phong River Basin. In
relation to this, the non-structural measures including risk-based zoning could
be considered as an effective solution in mitigating the flood threat in the
future. Thus, a coupling of the hydrological model HEC–HMS and hydrodynamic
model HEC–RAS, which increases the robustness and predictability to the overall
findings, was applied to assess flood hazard in this study. The outcomes
highlighted that the applications of the HEC–HMS and HEC–RAS models are
suitable for the study area with the Nash-Sutcliffe Efficiency (ENS)
varied between 0.75 to 0.87 and the coefficient of determination (R2)
ranged between 0.81 to 0.92. Moreover, the flood zone mapping was also carried
out based on the Flood Hazard Rating (FHR) analysis. As a result, the flood
hazard areas were determined which covers about 16.5% of the total river basin
areas, and it was classified into four zones, i.e. extreme (18.79% of inundated
area), high (46.33% of inundated area), moderate (18.24% of inundated area),
and low (16.64% of inundated area), respectively. The obtained findings can be
useful as the adaptation guideline for water resources planning and flood
management in the lower Nam Phong River Basin and other parts of Thailand.
Keywords: Flood hazard; Flood Hazard Rating; HEC-HMS; HEC-RAS; Vulnerability

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