Groundwater quality of Assini and Iria Valleys in Peloponnese Region, Greece

Abstract

The degradation of groundwater quality is mainly related to the intensification of agriculture, the use of fertilizers and the overexploitation of groundwater aquifers which in coastal areas leads to sea water intrusion. An assessment of groundwater quality was conducted in Assini and Iria valleys. Groundwater samples was collected in the beginning (May) and in the end (October) of the irrigation season and subjected to chemical analyses for the main anions and cations. Groundwater was classified using the Piper diagram. Chloride and E.C. (electrical conductivity) contour maps of the regions were obtained in order to evaluate the extent of sea water intrusion. The main cultivated crops in the regions are irrigated citrus and high amounts of nitrogen fertilizers are used. Nitrate concentration of groundwater was found often to exceed the value of 50 mg/l. A comparison was made with the situation that was prevailing in the region eight years ago. The suitability of groundwater for irrigation was evaluated.

Keywords

• nitrate, sea water intrusion, fertilizer movement, nitrate

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