Resumen de Caracterización de las familias hidrogeoquímicas en el aquífero costero de Telde (Gran Canaria)
María del Carmen Cabrera Santana, Emilio Custodio Gimena
An area of about 75.5 km2 has been studied. lt supports a high population density (ca. 1000 inh./ km2). Tradicionally agricultural, its groundwater exploitation is very important, with 145 water sources, mainly large diameter wells (dephts ranging from 15 to 239 m). The main water use is agriculture, but also human supply. The aquifer system from wich water is drawn is complex: Miocene phonolite lavas and ashflow deposits at the North, sediments of Las Palmas Detritic Formation in the central part and Recent Basalts at the South. Hydrogeochemical studies of groundwater have allowed to characterize different groundwater families, depending on the exploited materials and/or the existence of some modifying phenomena. HCO3-Mg water and CI-HCO3-Na water are related with basa/tic and phonolitic materials respectively. lrrigation return waters produce 5O4-Na ar HCO3-Cl-Na water, water supply system leaks generate Cl-5O4-Na-Mg water, marine intrusion produces Cl-5O4-Na water in the coastal strip and CI-Mg water situated at the South can be due to salinity of recharge due to aridity or water mineralization because of the volcanic CO2 present in the aquifer.
