The man-made water bodies cool down by evaporation, convection and radiation. Cooling towers which enable heat transfer into the atmosphere by evaporation is another excellent alternative.
The other way of preventing this pollution is by congregation. This is a process in which waste heat is recycled for reuse. To prevent thermal pollution caused by urban runoff, storm water facilities which help in increasing the groundwater levels can prove to be extremely beneficial.
Thermal pollution has to be controlled with immediate effect, as more and more water bodies are getting affected by the same. It not only disturbs the ecosystem in the water, but also wrecks the quality of the water and the area around it.
Read more at Buzzle: http://www.buzzle.com/articles/thermal-pollution.html