Evaporation directly from a lake surface has a direct effect on water levels of the lakes. If nothing else changes, and evaporation increases, the levels of the lakes will decrease. If evaporation decreases, the lake levels will increase. Three factors that contribute to large rates of evaporation are large differences between the water temperature and air temperature, high wind speeds, and low relative humidity. If all of these conditions are present, very high evaporation rates can occur.
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