GIS-Based Flood Hazard Mapping in Itang District of the Gambella Region, Ethiopia Dame Tadesse Addis Ababa University Venkata Suryabhagavan Karuturi (
[email protected] ) Addis Ababa University https://orcid.org/0000-0003-2528-9106 Dessie Nedaw Addis Ababa University Research Keywords: Analytic hierarchy process, Frequency factor, Flood hazard zone, Gumbel distribution Posted Date: April 27th, 2021 DOI: https://doi.org/10.21203/rs.3.rs-430787/v1 License: This work is licensed under a Creative Commons Attribution 4.0 International License. Read Full License GIS-based flood hazard mapping in Itang District of the Gambella Region, Ethiopia Dame Tadesse, K. V. Suryabhagavan* and Dessie Nedaw School of Earth Sciences, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia *Corresponding Author: E-mail:
[email protected] Tel.: +251-911998588 1 GIS-based flood hazard mapping in Itang District of the Gambella Region, Ethiopia Abstract Flood is one of the natural disasters that affect societies around the world. Every year, flood claims hundreds of human lives and causes damage to the global economy and environment. Consequently, the identification of flood-vulnerable areas is important for comprehensive flood risk management. This study aims to delineate flood hazard areas in Itang District of Gambella Region, Ethiopia, After obtaining discharge level through the method, the region's flood inundation area was mapped at 5, 10, 25, 50, and 100-year recurrence intervals. The developed methodology processes six parameters, namely, slope, elevation, land-use/land-cover, rainfall, discharge, and soil. Each criterion was evaluated with the aid of AHP and mapped by GIS. Data were assorted into five suitability classes, viz., very high, high, moderate, low, and very low flooding areas, representing 29.7%, 27.8%, 18.5%, 12.7%, and 11.4%, respectively.