Hidrogeología del delta del Río Adra

Abstract

The geographical delta of the Adra River, comprises a complex aquiferal system running through neogene-quaternary materials, which in turo overlie impermeable Alpujarride metapellitic rocks. The mean average rainfall is some 400 mm, the average temperature above 18°C, and it is calculated that, including infiltration and runoff, the annual rainwater amounts to more than 100 mm. The groundwater in general ranges from bad to mediocre in quality, both for domestic and agricultural use, containing as it does calcic-magnesium sulphates andlor sodium chlorate to quantities of 1 to 4 g/l in solution. The principal source of recharge for the system is from filtration through the permeable bed of the Adra River, with which in hydraulic terms it is closely related. The resources of this system at the moment exceed the demand being put on them and it would be possible to obtain greater benefits from it in an area where a general shortage of water is one of the main factors limiting development.