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Mauritius consists of 25 major river basins and the largest are the Grand River South East and the Grand River North West. Most rivers are perennial, originating from the central plateau. Discharge to the sea is estimated to be 0.5 km3/year. Mauritius has five main aquifers. Total renewable water resources are estimated at 2.751 km3/year (Table 1). Total exploitable water resources are estimated at 1.083 km3/year.
Total dam capacity is 93 million m3. There are five main storage reservoirs (Mare aux Vacoas, La Ferme, Mare Longue, La Nicoliere, Piton du Milieu) and one impounding rockfill dam (Midlands Dam). Minor reservoirs for hydropower are Tamarin, Eau Bleue and Diamamouve and there are two in-field minor storage reservoirs at Valetta and Dagotière, which regulate water for irrigation. The amount of treated wastewater was 20.6 million m3/year in 2002.