A lake has an area of 15 km2. Observation of hydrological variables during a certain year has shown as follows:
Precipitation = 700 mm/year;
Average inflow Qin = 1.4 m3s;
Average outflow Qout = 1.6 m3/s.
Assume that there is no net water exchange between the lake and the groundwater. What is the evaporation during this year ?
1
480 mm
2
280 mm
3
380 mm
4
180 mm