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Characterisation of Hydrological Drought and Implications for Sustainable Water Resources Management in the Sokoto-Rima River Basin (SRRB), Nigeria

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Document pages: 15 pages

Abstract: Hydrological drought isusually characterised by water loss over time from both underground and surfacesupplies. Thus for this study, the assessment of hydrological drought wascarried out by employing Cumulative Rainfall Streamflow Anomaly as preliminary tools for the presence of drought signatures whiledetailed characterisation was via Streamflow Drought Index (SDI). The resultsrevealed that hydrological drought was observed in all the stations; however,though in general, the stations could be classified as experiencing near normaldrought conditions with mild drought signatures. The findings also revealedthat the average streamflow deficit volume and durations of the hydrologicaldrought severity were 1.780 Mm3 and 192 months, 1.444 Mm3 and 252 months, 3.148 Mm3 and 252 months, and 0.159 Mm3 and 372 months for Bakolori, Goronyo (pre dam construction era), Goronyo (postdam construction era) and Zobe stations, respectively. The results alsorevealed the relevance of flow duration curve and analysis of frequency ofdrought state transition for the development of scenario-based basin waterresources management protocol. The coefficient of determination (R2)statistic of the developed regression models indicate that 73.3 and 86.5 variation in streamflow dynamics across the Basin can be explained by climatechange variables. However, for sustainable management of water resources in theBasin, it is imperative that characterisation of hydrological drought andmonitoring should employ robust indices which use improved monthlyprecipitation estimates under global warming scenario in addition to ensuringthat there is a shift from reactive to proactive approach in order to combathydrological risk. Hence, a robust framework that finds application both forplanning mitigation actions which embody strategic, tactical and emergencycomponents should be designed; to this end, analysis of persistence andrecurrence of drought in time and determination of possible recurrent patternsare necessary.

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