Abstract:

The feasibility study was designed to assess water efficiency in municipal water supply systems. The total amount of produced and distributed water was 14,184,650 m3 in 2018 for 79,296 people in Marmaris. Nonetheless, the volume of billed water was only 8,131,491 m3 therefore, the non-revenue water percent was 42.7% involving unbilled authorized consumption (5.1%), physical losses (28.9%), and administrative losses (8.7%). According to projections, water demand including the losses was 14,184,650 m3 in 2018, and is expected to increase to 22,204,429 m3 in the without-project scenario whereas it would reach 19,852,469 m3 in the with-project scenario by the year 2038. Consequently, five measures were proposed establishing district metered areas and pressure management areas, infrastructure development, updating and extending Supervisory Control and Data Acquisition Systems, and other complementary measures to improve the efficiency of the water supply system. Applying the proposed actions would reduce the total water losses from 37.6% to 24.7% (19.9% physical, 4.8% administrative) in 2023, and the value would reach 20.3% (18% physical, 2.3% administrative) in 2038. This study presents that the proposed investment’s estimated total cost is € 2,956,739.26 and is foreseen to be implemented throughout 2021 and 2022. The Payback Period of the investment is 5.5 years (2027), and the Discounted Payback Period is 6.8 years (2028). The assessment shows that the unitary cost of water evolves from 1.31 €/m3 in the current situation to 1.00 -1.30 €/m3 in 2038, based on the scenario selection (with-/without- project scenario) and the investment distribution periods.

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