Hydrochemistry and Evolution of Water Quality in a Context of Aridity and Increasing Agriculture in Three River Sub-Basins of Santiago Island (Cape Verde)

In regions under development and facing recurrent droughts, increasing the area of irrigated agriculture may create additional disruption in water resources management. The present study was focused on three river sub-basins with highest agricultural intensity (S. Miguel, Ribeira Seca S. Domingos) Santiago Island (Cape Verde). Sets wells were selected to evaluate influence salinization practices hydrochemistry. This assessment performed by using data from bibliography (2003) a recent campaign (2016). chemistry indicates lower mineralization Miguel sub-basin. Nitrates nitrites, typically associated diffuse pollution, are all sub-basins, but varying patterns. Additionally, sodium chloride waters occur especially those closest coastline. turn, bicarbonate-magnesium facies identified Domingos, at furthest point coast, indicating geological control. comparison between two periods suggests decrease quality. rising extension irrigation aridity should intensify already observed soil salinization. Thus, review highlights strategic importance monitoring basin level as management tool for preservation insular arid developing regions.