Abstract— During the last 5 decades precipitation records in Jordan have shown a general decreasing trend. Such decreases have certainly their impacts on the availability of surface and groundwater, on soil moisture contents (green water) and on the surface and groundwater qualities.
In this article the impacts of decreasing precipitation on the availability of surface and groundwater will be analyzed.
The results show that a decrease in precipitation of 10% will result in the reduction of flood runoff by about 39%, and a reduction in groundwater recharge of 16% in rain rich areas receiving more than 500mm/yr increasing to 59% in areas receiving moderate precipitation of around 300mm/yr.
Keywords— climatic changes, evaporation calculation, surface and groundwater.
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