Hydrochemical study of an aquifer system in an agricultural area in South West Spain

A hydrochemical study of an aquifer located in a wide agricultural region in the Guadalquivir river basin has been carried out. Samples of 51 points in the aquifer network have been taken, and 30 parameters, indicating its physical-chemical quality, have been determined for each sample. Classifications of the samples according to their hydrochemical facies have been established and the quality of waters for both agricultural and industrial uses has been tested. Its characteristics for processing to make them drinkable have also been assessed. Isocontent maps of some parameters have allowed to show the alarming pollution state of waters caused mainly by nitrates, and to a lesser extent by organic compounds and metals. Statistical Quality Indexes of both global and partial type has also been established.