Assessment of Potential Suitable Surface Irrigation Area in Borkena River Catchment, Awash Basin, Ethiopia
Journal of Water Resources and Ocean Science
Volume 9, Issue 5, October 2020, Pages: 98-106
Received: Mar. 18, 2020;
Accepted: Apr. 15, 2020;
Published: Sep. 24, 2020
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Kasye Shitu, Department of Soil and Water Resource Management, Assosa University, Assosa, Ethiopia
Shemelis Berhanu, School of Water Resource and Environmental Engineering, Haramaya Institute of Technology, Haramaya University, Haramaya, Ethiopia
Although Ethiopia has abundant land for irrigation, only a fraction of its potential land is being utilized and the economy of the country subjected to a direct impact of climate change. So, assessment of land suitability for irrigation purpose is important to utilize the land resources efficiently and for the sustainable production of crops and food security of the ever increasing people in the country especially the study area. This study was initiated to assess the land resources which is potentially suitable for surface irrigation in Borkena watershed by using Geographic Information System (GIS). To identify the land which is suitable for irrigation purpose, the following factors such as soil type, slope, land use/cover and distance from water supply (sources) were taken into account and classified based on the FAO guideline for land evaluation in to S1, S2, S3 and N suitability classes independently. The final existing and potentially irrigable land was identified by weighting overlay these factors of suitability. The suitability analysis of the parameters indicates that 90.65% of slope, 72.03% of soil depth, 94.73% distance from a water source of the study area, 100% soil drainages and 100% of soil texture were identified in the range of highly suitable (S1) to marginal suitable (S3) for surface irrigation. But, when all the above physical suitable area determination factors were weighted together using weighted overlay in Arc GIS software by restricted other land use/cover for irrigation development without agricultural land indicates only 16.13% highly suitable (S1), 47.12% moderately suitable (S2), 31.58 marginally suitable (S3) and 5.17% non-suitable (N) area for surface irrigation development.
Assessment of Potential Suitable Surface Irrigation Area in Borkena River Catchment, Awash Basin, Ethiopia, Journal of Water Resources and Ocean Science.
Vol. 9, No. 5,
2020, pp. 98-106.
Copyright © 2020 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/
) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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