Considerations of past and present geological conditions are crucial for site selection of any engineering works and environmental activities. The need of engineering geological involvements in the above mentioned activities increase day to day since its commencement. Due to severe problems of water supply to the Mekelle town from other resources, Tigray Water Resource Bureau proposed the Giba dam across Elala River. As previous study shows, more than 20 micro and small dams were constructed within the Mekelle drainage basin. But most of them were failed due to many reasons and consideration...