Abstract
Managing both groundwater and surface water resources is the ultimate aim of the present work. Surface water resources are expressed as runoff water down- percolating due to flash flood events for catchments areas at Halayib and Shelatine sub regions. Hydrologic response of the selected watersheds subjected to single storm event is tested. Base flow source areas and major recharge areas were delineated by field infiltration tests using conventional infiltrometer and the water isotopes of O-18 and H-2. Groundwater resources are represented by two main aquifers; Quaternary aquifers composed of wadi fill deposits resting unconformable over fluviatile sandstone of Um-Barmil Formation of Upper Cretaceous age. Isotopic data (δ18O and δ2H) has revealed the presence of paleowater (highly depleted in delta values) in a hydraulic connection with modern water of Quaternary aquifer (slightly enriched in delta values) receiving direct recharge from the present day precipitation. Accordingly mixing between modern water of Quaternary aquifer with paleowater of Cretaceous aquifer is most likely to occur.
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