Zarema May Day Dam, Ethiopia

Name of project:
Wolkayite Sugar development project – detailed design of Zarema May Day dam and its appurtenant structures – Ethiopia
Country: Area of study:
Ethiopia Zarema River basin, North-western Tigray
Customer:
SGI Studio Galli Ingegneria (Padova, Italy)
Project objectives:
To carry out a geological, geomorphological, structural and geo-mechanical study of the area identified as suitable for the realisation of an irrigation system related to a dam along the course of the Zarema River in the province of Tigray
Composition of the working group:
GEOMAP
Personnel involved:
2 field geologists, 2 geologists photointerpreters, 1 GIS expert
Number man/months:
15
Project steps:
In a first phase of the project the pre-processing of very high resolution satellite imagery (Worldview 2) was carried out, particularly: ortho-rectification, pan-sharpening, mosaicking and contrast stretching. These operations were aimed at the production of data suitable to detailed photointerpretation and to field work.
Subsequently, the interpretation of the above-mentioned images started, over an area embracing the total extension of the planned Zarema reservoir. The following themes were extracted: geology, drainage network, landforms and geomorphological processes (with special attention to landslides and erosion), total field of lineations (including faults, fractures, dykes and regional lineaments). In parallel with this step of photointerpretation, a first reconnaissance mission was carried out, in order to check the conditions and accessibility of the site and to plan the successive mission. The latter, which lasted 15 days, was aimed at the realisation of a detailed geo-structural and geo-mechanical survey and to the verification of the photointerpretation data in the area allocated to the planned irrigation system.
Following the field work, the processing of collected data was performed, directed at the geo-mechanical characterization of outcropping rocks by means of indices of rock mass quality (RMR and Q) and the realization of detailed geo-structural maps of the study area at 1:1,000 and 1:5,000 scales. The themes obtained by photointerpretation were also revised in this phase.
For the present study, the following documents were produced: a report, drainage network, geomorphological, total field of lineations and photo-geological maps covering the whole Zarema reservoir area (at 1:10,000 and 1:25,000 scale); detailed geo-structural maps and geological sections for the irrigation system area (at 1:1,000 and 1:5,000 scale)
Start (year/month): End (year/month): Value of the project:
07/2013 01/2014