Elements of water balance, by percentage of reliability and years (mln. m3)
Water balance elements Total (mln. m3) Statistics for 1961 – 2013 (mln. m3)
During 2013 Min Avg Max
IN
The volume of water entering the lake 710.4 513.3 777.5 1125.3
Precipitation on the lake surface 468.8 367.7 506.4 802.3
Inflow underground water volume of lake Sevan, annual 94.2 48.4 76.5 106.4
Groundwater flow by Arpa-Sevan tunnel, annual 39.08 0 0 0
OUT
The volume of water lost from the lake 169.95 99.5 451.9 1644.2
Evaporation from the lake surface 1138.2 916.2 1071.3 1371.4
Outflow underground water volume of lake Sevan, annual 14.4 5.4 13.2 20
Accumulation (decrease) 72.8 -1689 -55.2 912.5
Absolute uncertainty 15.1 0 1 0
Relative uncertainty 1.1 0.2 3.42 17
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