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The hydrogeological conceptual model of the river San Antonio basin contemplates the existence of two aquifers: one in the Quaternary piroclastic deposits and other in Quaternary fractured lavas. It has been interpreted from the hydrogeophysical interpretation of 55 vertical electrical soundings, correlated with the information of the static level of 21 dug wells, lithology of 21 drilled wells, and location of 21 springs and San Antonio river differential gau- gings. The first aquifer is shallow, unconfined and is exploited for domestic uses. The second one is mainly unconfined and in some sectors is semiconfined, and exploited by drilled wells for the public supply of the municipality of Nejapa. From the point of view of intrinsic vulnerability, it was determined that 20% of the analyzed sector of the aquifer in the Quaternary piroclastic deposits, presents high vulnerability.

Hidrogeofísica de la cuenca del Río San Antonio, El Salvador: Aplicación al modelo conceptual y vulnerabilidad intrínseca