Meanwhile the Hydrometeorological Service indicates that in Azerbaijan, the trend is for an increase in winter river flows and a decrease in summer flows, combined with a reduction of 15 to 20 per cent of yearly water availability. The much larger precipitation (and snow melting) in the ranges controls the magnitude and seasonal variations of the rivers in the lowlands. The map also depicts that a significant proportion of the surface water in Azerbaijan is locally produced. In fact, some 25 per cent (or 6.5 kmVy) of the discharge of the Kura River into the Caspian Sea comes from Azerbaijani national rivers.