The present work deals with the definition of the hydrodynamic and hydrochemical features of the aquifer of the Follonica-Scarlino coastal plain (southern Tuscany, Italy), in order to obtain an adequate knowledge for its correct mathematical modelling. On the basis of lithostratigraphic data the location and geometry of water-bearing sandy gravels were defined, and the hydrogeological cross sections and isopach maps were drawn. From all these data, it results that the gross volume of the reservoir is 320•106 m3 (of which 32•106 m3 is estimated as the effective pore space) and the profitable area for the water exploitation is located in the central-southern sector of the plain. The measurements of the water level in wells allowed the reconstruction of piezometric surface for the observation period (semptember 2000 and january 2001); such a reconstrucion shows the strong influence of exploitation on the groundwater flow with the formation of large areas of negative hydraulic head which almost concide with the main well field. Furthermore, the results of pumping tests, which permitted to estimate average hydraulic conductivity and transmissivity of 1.5•10-4 m/s and 2.3•10-3 m2/s respectively, offer a first indication of the good comprehensive water yield of the aquifer. Fi-nally, measurements of the electrical conductivity and major ions in wells show that the groundwater is characterized by chloride and sulphate saline intrusions and cation exchange processes.
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