Elements of water balance, by percentage of reliability and years (mln. m3)
Water balance elements Total (mln. m3) Statistics for 1961 – 2014 (mln. m3)
During 2014 Min Avg Max
IN
The volume of water entering the lake 626.1 513.3 777.5 1125.3
Precipitation on the lake surface 541.7 367.7 506.4 802.3
Inflow underground water volume of lake Sevan, annual 94.3 48.4 77.1 106.4
Groundwater flow by Arpa-Sevan tunnel, annual 34.76 0 0 0
OUT
The volume of water lost from the lake 269.63 99.5 447.6 1644.2
Evaporation from the lake surface 1147.3 916.2 1072.6 1371.4
Outflow underground water volume of lake Sevan, annual 14.4 5.4 13.2 20
Accumulation (decrease) -44.7 -1689 -48.4 912.5
Absolute uncertainty 5.7 0 1 0
Relative uncertainty 0.4 0.2 3.42 17
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