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Surface water and groundwater resources
The island has an average annual precipitation of 2 300 mm, or 1 427 million m3 and renewable water resources are estimated at about 300 million m3/year (Table 2).
Saint Lucia is of volcanic origin with a number of rivers, wetlands, streams and springs. Based on the drainage networks of the island, the landscape has been divided into 37 watershed basins, from which a number of perennial streams emanate. The most important rivers in the country are Cul de Sac, Canelles, Dennery, Fond, Piaye, Doree, Canaries, Roseau, and Marquis.
Surface water catchments areas are supply areas for drinking water. They are relatively small and characterized by steep terrain over which runoff occurs fairly rapidly resulting in limited percolation. Surface water yields for drinking water purposes vary due to increased abstraction.
Lakes and dams
In 2009, total dam capacity in Saint Lucia was estimated at 3 million m3. The most important dam is the Roseau dam with a reservoir capacity of 2.6 million m3.
Saint Lucia has no important lakes.