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The granitic islands have many small, steep watercourses, but most of them have only ephemeral flows. Groundwater resources are limited as not much water is stored at the feet of the hills and the water available is often hard and contains traces of salt. The wetlands have recently become an attraction for eco-tourism given their rich biodiversity. The total dam capacity is 0.970 million m3. The Rochon Dam, which collects its waters from the Rochon River, has a storage capacity of 0.050 million m3. Surplus water is forwarded to the La Gogue Dam, which has a storage capacity of 0.920 million m3.
In 2003, 8.8 million m3 of wastewater were produced. Wastewater is treated at the central sewerage treatment plant in Victoria and Beau Vallon with an annual production of 0.9 million m3/year (Table 2). The remainder is being disposed of via septic tanks. Industry reuses about 0.006 million m3/year of the treated wastewater. About 1.0 million m3/year of desalinated water is produced for potable use to compensate for the shortage that occurs during the dry period. There are four desalination plants, two on Mahe Island, one on Praslin Island and one on La Digue Island.