Hydraulic Engineering

ABSTRACT Floods are the most common natural disasters that affect societies around the world. Ethiopia is a country which affected by flood in many parts of the country. The aim of this study is the assessment flood hazard and risk of the Barga River using Geographical Information System (GIS) using multi criteria evaluation method. The factors that cause like: slope, elevation, soil type, geology, rainfall, drainage density, flow accumulation, topographic wetness index and land use land cover, these parameters was reclassified based on the susceptibility for the flood. The factors ranked and divided into five classes ranging from very low to very high with the integration of Geographical Information System (GIS). Weight of each factors was done by analytical hierarchy process method of the nine by nine matrix was solved in IDRISI 32 software within the Consistency ratio was 0.03 the critical consistency is acceptable. Flood hazard map was done by combination of all factors within weighted overlay method and 19.06%, 20.31%, 28.18%, 22.35%, 10.09459% of the area is under very high, high, moderate, low and very low respectively of flood hazard. Risk map was from the corporation of three parameters like population density, land use land cover and flood hazard map within equally weighted and 0.14%, 8.38%, 64.86%, 26.29%, 0.32% of the total area was under very high, high, moderate, low and very low of flood risk respectively. The flood hazard and risk map produced by GIS was validated using ground truth point location of the flooding area collected during the field surveying. The magnitude of discharge that causes flooding in watershed was calculated from daily peak discharge. The frequency was analyzed by person type III and general logistic method of the best fit selected L-moment method for 2, 5, 10, 15, 20, 25, 50, 100, and 200 of the return period.
Keywords: Analytical Hierarchy Process, Barga River, flood hazard, flood risk, Multi Criteria

ABSTRACT Floods are the most common natural disasters that affect societies around the world. Ethiopia is a country which affected by flood in many parts of the country. The aim of this study is the assessment flood hazard and risk of the Barga River using Geographical Information System (GIS) using multi criteria evaluation method. The factors that cause like: slope, elevation, soil type, geology, rainfall, drainage density, flow accumulation, topographic wetness index and land use land cover, these parameters was reclassified based on the susceptibility for the flood. The factors ranked and divided into five classes ranging from very low to very high with the integration of Geographical Information System (GIS). Weight of each factors was done by analytical hierarchy process method of the nine by nine matrix was solved in IDRISI 32 software within the Consistency ratio was 0.03 the critical consistency is acceptable. Flood hazard map was done by combination of all factors within weighted overlay method and 19.06%, 20.31%, 28.18%, 22.35%, 10.09459% of the area is under very high, high, moderate, low and very low respectively of flood hazard. Risk map was from the corporation of three parameters like population density, land use land cover and flood hazard map within equally weighted and 0.14%, 8.38%, 64.86%, 26.29%, 0.32% of the total area was under very high, high, moderate, low and very low of flood risk respectively. The flood hazard and risk map produced by GIS was validated using ground truth point location of the flooding area collected during the field surveying. The magnitude of discharge that causes flooding in watershed was calculated from daily peak discharge. The frequency was analyzed by person type III and general logistic method of the best fit selected L-moment method for 2, 5, 10, 15, 20, 25, 50, 100, and 200 of the return period.
Keywords: Analytical Hierarchy Process, Barga River, flood hazard, flood risk, Multi Criteria Evolution,

Floods are the most common natural disasters that affect societies around the world. Ethiopia is a country which affected by flood in many parts of the country. The aim of this study is the assessment flood hazard and risk of the Barga River using Geographical Information System (GIS) using multi criteria evaluation method. The factors that cause like: slope, elevation, soil type, geology, rainfall, drainage density, flow accumulation, topographic wetness index and land use land cover, these parameters was reclassified based on the susceptibility for the flood. The factors ranked and divided into five classes ranging from very low to very high with the integration of Geographical Information System (GIS). Weight of each factors was done by analytical hierarchy process method of the nine by nine matrix was solved in IDRISI 32 software within the Consistency ratio was 0.03 the critical consistency is acceptable. Flood hazard map was done by combination of all factors within weighted overlay method and 19.06%, 20.31%, 28.18%, 22.35%, 10.09459% of the area is under very high, high, moderate, low and very low respectively of flood hazard. Risk map was from the corporation of three parameters like population density, land use land cover and flood hazard map within equally weighted and 0.14%, 8.38%, 64.86%, 26.29%, 0.32% of the total area was under very high, high, moderate, low and very low of flood risk respectively. The flood hazard and risk map produced by GIS was validated using ground truth point location of the flooding area collected during the field surveying. The magnitude of discharge that causes flooding in watershed was calculated from daily peak discharge. The frequency was analyzed by person type III and general logistic

Floods are the most common natural disasters that affect societies around the world. Ethiopia is a country which affected by flood in many parts of the country. The aim of this study is the assessment flood hazard and risk of the Barga River using Geographical Information System (GIS) using multi criteria evaluation method. The factors that cause like: slope, elevation, soil type, geology, rainfall, drainage density, flow accumulation, topographic wetness index and land use land cover, these parameters was reclassified based on the susceptibility for the flood. The factors ranked and divided into five classes ranging from very low to very high with the integration of Geographical Information System (GIS). Weight of each factors was done by analytical hierarchy process method of the nine by nine matrix was solved in IDRISI 32 software within the Consistency ratio was 0.03 the critical consistency is acceptable. Flood hazard map was done by combination of all factors within weighted overlay method and 19.06%, 20.31%, 28.18%, 22.35%, 10.09459% of the area is under very high, high, moderate, low and very low respectively of flood hazard. Risk map was from the corporation of three parameters like population density, land use land cover and flood hazard map within equally weighted and 0.14%, 8.38%, 64.86%, 26.29%, 0.32% of the total area was under very high, high, moderate, low and very low of flood risk respectively. The flood hazard and risk map produced by GIS was validated using ground truth point location of the flooding area collected during the field surveying. The magnitude of discharge that causes flooding in watershed was calculated from daily peak discharge. The frequency was analyzed by person type III and general logistic method of the best fit selected L-moment method

Floods are the most common natural disasters that affect societies around the world. Ethiopia is a country which affected by flood in many parts of the country. The aim of this study is the assessment flood hazard and risk of the Barga River using Geographical Information System (GIS) using multi criteria evaluation method. The factors that cause like: slope, elevation, soil type, geology, rainfall, drainage density, flow accumulation, topographic wetness index and land use land cover, these parameters was reclassified based on the susceptibility for the flood. The factors ranked and divided into five classes ranging from very low to very high with the integration of Geographical Information System (GIS). Weight of each factors was done by analytical hierarchy process method of the nine by nine matrix was solved in IDRISI 32 software within the Consistency ratio was 0.03 the critical consistency is acceptable. Flood hazard map was done by combination of all factors within weighted overlay method and 19.06%, 20.31%, 28.18%, 22.35%, 10.09459% of the area is under very high, high, moderate, low and very low respectively of flood hazard. Risk map was from the corporation of three parameters like population density, land use land cover and flood hazard map within equally weighted and 0.14%, 8.38%, 64.86%, 26.29%, 0.32% of the total area was under very high, high, moderate, low and very low of flood risk respectively. The flood hazard and risk map produced by GIS was validated using ground truth point location of the flooding area collected during the field surveying. The magnitude of discharge that causes flooding in watershed was calculated from daily peak discharge. The frequency was analyzed by person type III and general logistic method of the best fit selected L-moment method

Supplemental material, sj-docx-1-smo-10.1177_20503121211054994 for Awareness and knowledge of diabetic retinopathy in diabetic patients at a General Hospital in Northwest Ethiopia by Getasew Alemu Mersha, Yezinash Addis Alimaw, Asamere Tsegaw Woredekal, Aragaw Kegne Assaye and Tarekegn Chekilie Zeleke in SAGE Open Medicine