Abraham and Isaac Explore the Groundwater Resources of the Negev
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The stories about the difficulties which the Patriarchs’ herdsmen experienced in locating wells for the supply of drinkable water for their herds, describe the special hydro-geological conditions of the region of Beer-Sheva. The bedrock of this region is chalk, which is usually impermeable, except of limited areas where it is fractured. Water which penetrates these fractures dissolves and widens them creating subsurface channels enabling the flow of non-saline groundwater. Thus wells which happened to penetrate into such channels got a relatively ample supply of good water.