Environmental Risk Assessment and Remediation

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Flood Risk Zonation Using GIS Techniques: District Charsadda, 2010 Floods Pakistan.

After agriculture revolution flooding has become the most potential natural hazard in the world. Pakistan being the sixth largest population of the world and having huge irrigation system is also facing this problem which worsened in recent decades. In 2010, monsoon season brought unusually large amount of rainfall and completely destroyed agriculture infrastructure in many districts all over the country. Charsadda district was the most severely affected district by both flash floods and reverine floods in 2010. These floodplains are densely populated and there is a need to identify flood hazard risk zones to prevent further damages caused by such floods. This article aims to prepare flood hazard risk zones map using Geographical Information System techniques. Digital Elevation Model of 30 m resolution is used to prepare the final maps. Flood risk potential zones around the rivers are identified by multiple ring buffer analysis. All layers from Digital Elevation Model analysis and buffer analysis are combined by weighted overly analysis in ArcGIS software to generate potential flood hazard risk zones map. Flood hazard zones are based on historical flood events. The map has been divided further into the highest, higher, moderate, low and lower flood hazard zones.

Author(s): Farish S*, Munawar S, Siddiqua A, Alam N, Alam M