Abstract
Results of tritium content measurements of groundwater from western Nile delta are presented and compared with the tritium content of the Nile according to a given model. These results indicate the dependence of the tritium concentration on the depth of well and geophysical structure of its location and also its proximity to irrigation channels. The mean residence time of the groundwater in the investigated wells ranges from a few years to several hundreds of years. A contour map of tritium concentration isolines illustrates the decrease of tritium content values in the north direction towards the Mediterranean Sea due to sea-water intrusion. The clustered tritium isoline could be attributed to mixing with other water of older recharge. Also the salinity of groundwater increased in the direction of Mediterranean Sea which points out to sea-water intrusion in the groundwater.
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