Volume 4, Issue 4, December 2018, Page: 107-116
Modelling the Impacts of Land Use Change on Stream Flow in the Kimwarer Catchment Using SWAT
Daniel Kimutai Kiplagat, Department of Agricultural and Biosystems Engineering, University of Eldoret, Eldoret, Kenya
Julius Kipkemboi Kollongei, Department of Agricultural and Biosystems Engineering, University of Eldoret, Eldoret, Kenya
Clement Kiprotich Kiptum, Department of Agricultural and Biosystems Engineering, University of Eldoret, Eldoret, Kenya
Received: Oct. 26, 2018;       Accepted: Nov. 21, 2018;       Published: Jan. 3, 2019
DOI: 10.11648/j.ajwse.20180404.14      View  96      Downloads  29
Abstract
The Kimwarer River basin covers 138.2 km2. It has experienced ecosystem degradation due to extensive farming that has impacted on water yield. This study was undertaken to assess the impacts of land use changes on river flow using SWAT, a mathematical model that has the potential to predict the impact of land management practices on water at catchment scale. Current and historic flow data were collected for model calibration and validation. The model was then used to simulate stream flow for different land use and land cover scenarios by varying the extend of forest cover and agriculture. The model was successfully calibrated and validated for stream flow, and proved capable of predicting flow with R2 and NSE values of 0.79 and 0.31 respectively. During validation, the model predicted flows with R2 and NSE values of 0.70 and 0.50 respectively. For scenario analysis to determine the effect of land use change on stream flow, it was observed that runoff decreased with increase in forest cover, while base-flow increased. Introduction of terraces as a management operation on agricultural land reduced runoff by 46%. It is evident from the study that the current trend of land use change affects stream flow.
Keywords
Basin, Land Use, Modelling, Stream Flow, SWAT
To cite this article
Daniel Kimutai Kiplagat, Julius Kipkemboi Kollongei, Clement Kiprotich Kiptum, Modelling the Impacts of Land Use Change on Stream Flow in the Kimwarer Catchment Using SWAT, American Journal of Water Science and Engineering. Vol. 4, No. 4, 2018, pp. 107-116. doi: 10.11648/j.ajwse.20180404.14
Copyright
Copyright © 2018 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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