Anse La Raye Water Supply

The raw water intake and water treatment works (WTW) providing potable water to the village of Anse La Raye and the communities of Au Tabor & Massacre on the west coast of St Lucia was limited to a total of 0.1 million gallons per day by the capacity output of the water treatment works. At this capacity, the village and communities were under supplied, while the poor condition of the WTW meant it regularly failed to produce potable water within the WHO drinking water quality guidelines. Therefore, an upgrade in the treatment and supply to 0.4MGD was required to satisfy the projected demand of the village and communities to 2025 and to meet the water quality standards.

In addition, a pumice quarry and recreational waterfall upstream of the existing raw water intake point that caused a detrimental effect on the water quality being abstracted, necessitated the construction of a new raw water intake arrangement to ensure the abstraction of adequate volume and quality.

In order to achieve the water supply requirements of the village and communities, the upgraded system was designed to include – a new raw water intake arrangement, construction and installation of a water treatment plant, installation of a raw water pipeline, installation of a 200,000 gallon treated water storage tank, installation of a new treated water pipeline, and the refurbishment and installation of new pumps. At allowable WTW losses of approximately 10%, the required abstraction rate was approximately 0.45MGD to cause the supply of a minimum volume of 0.4MGD to the residents and businesses of the village and the communities.