Abstract

Availability of accurate flood maps and adequate understanding of the subsurface conditions can enhance the effective management of flood disasters. In this study, the GIS and the 2D resistivity imaging had been employed to carry out the preparedness phase of flood management. The objectives of the study include developing flood risk map and establishing link between the subsurface conditions and flood occurrence. The results showed that about 93% of the area is vulnerable to flood occurrence. The subsurface investigations revealed that the area is characterized by the presence of thick column of impermeable clayey overburden material. Correlation of 78.57% was established between the thickness of clayey overburden and the flood vulnerability. This suggests that the flood occurrence in the area is largely dependent on geologic factor. The study is useful in reducing flood damages and planning mitigation measures.

Highlights

  • Floods are among the most devastating natural hazards in the world

  • It was observed that the area is characterized by thick column of clayey overburden materials

  • The integration of the geographic information system and the geophysical subsurface investigation using the 2D resistivity imaging were used to examine the effects of subsurface conditions on flood vulnerability/occurrence of the study area

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Summary

Introduction

Floods are among the most devastating natural hazards in the world. The devastating effects of floods on lives and property can be more severe than any other natural phenomena. Flood can be described as a situation in which water temporarily covers land where it normally does not. This water comes from the sea, lakes, rivers, canals or sewers, it can be rainwater. Flood is triggered by nature, it affects areas where people settle and can bring severe hardship and misery to those that live in the area. Flood can be seen as an event that leave social, cultural and economic impacts on the people it affects

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