Spatial Appraisal of Seasonal Water Yield of the Sokoto-Rima Basin

Abstract

Understanding the dynamics of water yield as relates to water balance is vital for the functioning of ecosystems as well as model-based computation of their respective ecosystem services. In dryland regions such as the Sokoto-Rima basin, this is of cogent importance for effective planning, and management of its scarce water resources. In this study, we assess the spatiotemporal dynamics of quick flow (QF), local recharge (LR), and baseflow (B) between 1992 and 2015 using the Seasonal Water Yield (SWY) model of InVEST (Integrated Valuation of Ecosystem Service and Tradeoffs) software. Pre-classified land cover, rainfall, satellite-derived evapotranspiration, digital surface topography, and HYSOGs 250m soil datasets were used as software data inputs. The result of the study showed that QF, LR, and B depict similar spatial distribution with peak values generated within water-bearing land cover areas particularly water bodies and wetlands. QF was highest in 2002 (1,293.6 mm) while there were reductions in the subsequent years – 2012 and 2015. Similar patterns were observed in LR and B with much lower values. The temporal trend for the 23-year period of the study showed that QF had an increasing rate of 85,331 mm while decreasing rates of 56,131 mm and 27,597 mm were detected for LR and B respectively. Three key parameters – alpha, beta, and gamma showed evidence of sensitivity to changes in values. These water balance transactions provided an opportunity to review the impact of the sensitivity of the land cover, climate, and hydrogeological factors on water resources management particularly freshwater accounting in the Sokoto-Rima basin of the northwestern part of Nigeria.

Keywords

• Quick flow
• local recharge
• baseflow
• InVEST
• ecosystem services

Supporting Institution

None

Project Number

None

Thanks

We sincerely appreciate the Editor for the acceptance of this journal for submission and reviewers for their comments towards improving the quality of the paper.

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