Mauritius - Plaines Wilhems Sewerage Project

The present intervention concerns the Plaines Wilhems Sewerage Project. It’s designed because of the degradation of the coastal waters in the environs of the outfall from the St. Martin Treatment Plant, of the imminent pollution of the groundwater resources of the Plaines Wilhems aquifer and the surface waters of the area as well as the health risks associated with inadequate drainage capacity resulting in overflows. The Plaines Wilhems Sewerage Project consists of the expansion of a sewerage Treatment Plant at St. Martin, construction of a trunk sewer, construction of sewer reticulation systems and house connections and replacement of parts of the freshwater pipe-work system. It should improve the living environment for the people in the project area, contribute towards maintaining the earnings from the tourism industry, and benefit sugar cane-based as well as other farmers by providing treated effluent for irrigation water and compost for soil conditioning. The components of the project are: (a) construction of 41 km of sewers in diameters ranging form 200 mm to 600 mm laid to a depth ranging from 1.5 to 5.0 metres; (b) an estimated 823 access manholes at network nodes; (c) some 3,957 house connections and (d) replacement of about 10km of water supply pipes.