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Adeogun, A. G.
Department of Civil Engineering, Kwara State University, Malete, Nigeria
Ganiyu, H. O.
Department of Civil Engineering, Kwara State University, Malete, Nigeria
ABSTRACT
In this study, Soil and Water Assessment Tool (SWAT) was
interfaced with Mapwindow-GIS to
simulate the hydrology, predict sediment yield, water yield and water balance
into sub-basins of Asa river catchment in Kwara State, Nigeria. SWAT was
calibrated and validated using measured flow data from January, 2008 to
December, 2014. The model was evaluated using Coefficient of Determination, R2
and Nasch-Sutcliffe Efficiency, NSE which give acceptable results of 0.76 and
0.85 for Calibration and 0.70 and 0.74 for validation stage. Highest Annual Sediment yield of 20.71t/ha
was recorded in sub-basin 13 while the lowest value of 8.9t/ha was recorded in
sub-base 16. Annual sediment production rate was estimated as 437.6t/ha/yr
while the total sediment yield of 4,376.t/ha was produced in the watershed
during the simulation period. Predicted values of sediment concentration
is highest in sub-basin 23 (153,045.9mg/l) and has a lowest value of 26,781.9
mg/l in sub-basin 1. Categorization of erosion prone areas showed that 12
sub-basins are in low erosion prone zone, two (2) sub-basins moderate zone, 14
in severe while 3 sub-basins are in extreme category. The outcome of this study
confirmed that SWAT can be adopted as a decision support tool for sustainable
sediment and water management in the basin and other watershed in Sub Saharan
Africa Countries.
Keywords: Asa River, GIS, Nigeria, Sediment Yield, SWAT, Water Management
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Published
Thursday, December 27, 2018
Issue
Vol. 4 No. 2, DEC 2018
Article Section
GENERAL
The contents of the articles are the sole opinion of the author(s) and not of UJET.
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