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Surface water and groundwater resources
The island has an average annual precipitation of 2 083 mm, or 1 562 million m3 and renewable water resources are estimated at about 200 million m3/year (Table 2).
Compared to other countries in the region, Dominica has abundance of rivers and water. There are about 365 rivers and streams emanating from 35 watershed areas into which the island is divided. The ten largest rivers are the Indian, Picard, Layou, Roseau, Blenheim, Hampstead, Clyde, Pagua, Castle Bruce and Rosalie rivers. Most rivers originate on the slopes of the central mountain ranges, while a few originate as outcrops of underground springs along low-lying valleys.
Other Caribbean countries consider Dominica as an alternative source of water supply in times of need. As a result, the government has positioned itself to be an exporter of bulk water (IWCAM, 2011).
There is a large sewerage system servicing the capital, Roseau, with a minimal treatment; and two small sewerage systems which service the areas of Cane Field and Jimmit, with no treatment. In most areas, the dominant method of wastewater disposal is by septic tank (IWCAM, 2011).
Intake tanks and very small dams have been constructed with a total capacity estimated at 2 008 m3. About 44 of such structures exist; the largest one has a capacity of 271 m3.