The total annual flow is 39.22 billion m3/year with 86 per cent of the annual flow in the humid winter season (October-May), and the remaining 14 per cent of the annual flow in the dry summer season (July-September). Overall renewable water resources amount to 13,300 m3 per capita, of which 65 per cent is generated within Albania and the remaining 35 per cent from countries upstream. In combination with the characteristic porous, karstic and fissured aquifers, this results in huge renewable groundwater resources of an overall 1,250 million m3/year in seven main geological strata.