The area above Catalan and Sandy bays provided a rain-catchment area for Gibraltar. The water was stored in several tanks blasted into the Rock. The rainwater was then blended with water pumped from wells on the isthmus or distilled from the sea. The catchment ceased to be used as a source of potable water in the 1990s, when a desalinization plant built in the 1980s was expanded, but it still is used as a service reservoir.
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