Abstract
A mechanism of rainfall augmentation in the lee of big (~ 5000 MWe) power plants due to washout of liquid water content of cooling tower plumes by raindrops, has been studied by means of a one-dimensional plume model. The relative rainfall increase beneath the plume was estimated for various meteorological conditions and total outputs of cooling tower system. Usually the rainfall increase, doesn't exceed 20–40% and extends not more than 5–7 km from the power plant. In favourable conditions rainfall may however increase even 70 % or more over a large area. In such cases the amount of additionally deposited water may several times exceed the total emission from cooling towers. The total, yearly or seasonal increase of rainfall, which is much smaller due to variability of the wind direction, depends on local climatological conditions.
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