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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/hess-2017-421
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
11 Aug 2017
Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Hydrology and Earth System Sciences (HESS).
Hydro-Climatic Modelling of an Ungauged Basin in Kumasi, Ghana
Marian Amoakowaah Osei, Leonard Kofitse Amekudzi, David Dotse Wemegah, Kwasi Preko, Emmanuella Serwaa Gyawu, and Kwasi Obiri-Danso Kwame Nkrumah University of Science and Technology, Ghana
Abstract. The 13 km2 Owabi catchment provides about 20 % of water needs of the Kumasi metropolis has in recent times been prone to high anthropogenic activities, a source of worry to water resource management. A complementary hydro-climatic study of Owabi watershed has been carried out using Soil-Water-Assessment-Tool (SWAT) with the aim of simulating the stream-flow and water balance of the watershed and to predict its future state. The QGIS interface was used to launch SWAT for QSWAT. Stream-flow output from the model was calibrated against an empirically derived stream-flow dataset for Owabi and the efficacy of the technique tested. The SUFI-2 algorithm was used for calibration and validation on both daily and monthly temporal resolutions. Water loss from the catchment was due to evapotranspiration process followed by surface runoff. The model showed better prediction and low uncertainty for both calibration and validation at the monthly than daily timescale. From 2020 to 2050 under Representative Concentration Pathway 8.5 (RCP8.5), catchment water loss is expected to shift from the dominant evapotranspiraton to surface runoff. This would lead to increases in water yield and stream-flow amount. In general, the use of the SWAT model for hydrological assessment of the Owabi catchment has been successful and further studies on the assessment of water quality and pollution is currently being undertaken to provide a holistic view of water resource management at the catchment. This would aid effective decision making by water resource managers and boost water production for the Kumasi metropolis in the long-term.

Citation: Osei, M. A., Amekudzi, L. K., Wemegah, D. D., Preko, K., Gyawu, E. S., and Obiri-Danso, K.: Hydro-Climatic Modelling of an Ungauged Basin in Kumasi, Ghana, Hydrol. Earth Syst. Sci. Discuss., https://doi.org/10.5194/hess-2017-421, in review, 2017.
Marian Amoakowaah Osei et al.
Marian Amoakowaah Osei et al.
Marian Amoakowaah Osei et al.

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Short summary
The study used the SWAT model to simulate baseline (1985–2015) and projection (2020–2050) streamflow and water balance at the Owabi catchment. The simulated streamflow was compared with an observed to test the efficiency of model prediction. The main water loss at the catchment was by evapotranspiration. The comparison results were satisfactory on a monthly timescale. For projection, water loss shifted to surface runoff which could have a positive effect by increasing water yield and streamflow.
The study used the SWAT model to simulate baseline (1985–2015) and projection (2020–2050)...
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