A mathematical programme is formulated for a water network with new water sources included. Salinity and water hardness are considered in the model which is later solved using Max- Min Ant System (MMAS) to assess the impact of new water sources to the total cost of the existing network. It is efficient to include new water sources if the distance is short and if there is high penatly associated with failure to meet demand. MMAS can be used to find the best water network which include the new water sources at a minimum cost.
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