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Renewable water resources (RWR) are generated and replenished by precipitation and inflow of surface and groundwater from neighbouring countries throughout the hydrological year. Net precipitation (interflow as the difference between precipitation and actual evapotranspiration) replenishes surface run-off to rivers, lakes and recharge groundwater aquifers. Surface waters and groundwater flowing from neighbouring countries (external inflow or inflow from upstream countries) is an important part of the renewable water resources (UNECE, 2020b).