Analysis of Watershed Attributes for Water Resources Management Using GIS: The Case of Chelekot Micro-Watershed, Tigray, EthiopiaReport as inadecuate




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This study identified theimportance of watershed attributes for water resource management using ArcGISsoftware, ASTER DEM and satellite images for the Chelekot micro-watershed,Tigray, Ethiopia. The study also evaluate the different hydrological parameterswhich are significant for the water resource management within themicro-watershed and finds the alternative solutions for water harvesting in thestudy area through the introduction of suitable soil and water conservationstructures based on the finding. Principal watershed attributes includingdrainage pattern, topographic parameters, land use types, and soil types wereevaluated and interpreted for the study micro-watershed. ArcGIS software wasused for the computation, delineation of the boundary and morphometric analysisof the micro-watershed using topographical maps and ASTER DEM data. Resultsindicate that the micro-watershed has classified as a dendritic pattern withstream orders ranging from first to fifth order. The micro-watershed hashomogeneity in texture and lack of structural control of surface flow. Thedrainage density is medium which indicates the area contains soils with medium infiltrationrates and moderate relief. Drainage texture, stream frequency and the formfactor of the micro-watershed are 4.1, 1.7 and 0.4 respectively. Thebifurcation ratio of the micro-watershed ranges from 1 to 4.5 and theelongation ratio is 0.7 which reveals that the micro-watershed belongs to theless elongated shaped micro-watershed category. The mean bifurcation ratio ofthe whole micro-watershed is 3.3 indicating that the drainage pattern is notgreatly influenced by geological structures. The micro-watershed land coversincludes: cultivated land 75.8%, settlement and open land 10.5%, shrubs andplantation 13.2%, and water body 0.4%. The major soil types are Vertisol58%, Camisole 32%, Regosol 9.5% and Luvisol 0.7%. The textural classesare clay 5%, silty clay 22%, clay loam 17%, sandy loam 21% and loam35% based on the soil textural map of the micro-watershed. Our resultsrevealed that using GIS and ASTER DEM data based watershed morphometricanalysis and hydrological evaluation at watershed scale is more applied andprecise compared to other available techniques.

KEYWORDS

GIS, Morphometric Analysis, Watershed, Drainage Frequency, Drainage Density, Chelekot, Ethiopia

Cite this paper

Gebre, T. , Kibru, T. , Tesfaye, S. and Taye, G. 2015 Analysis of Watershed Attributes for Water Resources Management Using GIS: The Case of Chelekot Micro-Watershed, Tigray, Ethiopia. Journal of Geographic Information System, 7, 177-190. doi: 10.4236-jgis.2015.72015.





Author: Tesfaye Gebre1, Tigist Kibru1, Samuale Tesfaye1, Gebeyehu Taye1,2

Source: http://www.scirp.org/



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