Technical feasibility study on Ilauko raw water reservoir to supplement groundwater supply to save, Glazoue and Dassa-Zoume

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In Benin, several billion cubic meters of raw water goes directly into the sea every year, through rivers and streams. It is pertinent that the government is not able to have adequate sources of water supply in some parts of the country. The use of groundwater as source of water supply is the main practice. In Save, Glazoue and Dassa-Zoume, the sources of groundwater for the public water supply systems are fully utilised. Indeed, water shortages become worsened each year. It is estimated that potential water demand on the public systems during dry season is about 40% greater than supply and, also leakage in distribution network is about 20% of supply. This study, which examines the conditions under which Ilauko reservoir can be used to supplement the groundwater supply, has revealed that the reservoir can be used to supplement groundwater supply provided: The irrigatable land (under sugar cane cultivation) would not exceed 52% of total irrigable land. Present irrigated land is 23.6% of total inigable land. • Zone A plus B and half of C could be irrigated with the existing storage capacity • Above 52% of irrigable land reservoir capacity cannot meet the water demand for both water supply and irrigation. • The study further revealed that: • The quality of raw water in the reservoir is good for water supply. There is the need to provide minimum treatment. • Both groundwater and treated surface water can be mixed before distribution. • The recommended water treatment method is conventional method. A preliminary design of the unit processes for treatment is provided. It is important to observe that the solution provided envisages water supply to 100% of the population as opposed to the current 40% by SBEE.
A thesis submitted to the Board of Postgraduate Studies, Kwame Nkrumah University of Science and Technology, Kumasi, in partial fulfillment of the requirement for the award of Degree of Master of Science in Water Supply and Environmental Sanitation, 2001