The Nimboyores aquifer, located in the province of Guanacaste (Costa Rica) has been defined in this work as an unconfined aquifer, it is composed of three layers: the deepest one is a thick colluvium, the intermediate is a thin colluvium and at the top there is a sandy clay soil. The basement depth varies between 30 and 45 m. This model was obtained by correlating the results of 7 vertical electrical soundings with 50 wells with lithological information provided by the SENARA. The hydraulic conductivities of such layers are respectively 300, 60 and 10 m/d. The total recharge to the aquifer is of 1211 l/s, obtained from the water balance. Based on the record levels in 14 wells collected during 7 years monitored by SENARA, static levels were established for the driest month recorded. The conceptual model improved the understanding of the groundwater flow and the influence of the geological setting.

Acuífero; modelo; Nimboyores; nivel estático; balance hídrico; aforo diferencial; pozos