Dams and the local climate

The presence of a dam influences the microclimate of the territories all around due to the large mass of water that collects upstream of the dam. In fact water has a high thermal capacity, a parameter that indicates the quantity of heat required to raise the temperature of a body  1°C, which means that water absorbs a great amount of heat, which it takes from the atmosphere, in order to warm up.  In summer therefore the water absorbs great quantities of heat from the air thus mitigating the atmospheric temperature. The opposite takes place in winter, when the water cools, releasing a large amount of heat in the atmosphere. Near artificial reservoirs, in summer the atmospheric temperature is lower than in the surrounding areas, because the water takes away the heat from the air. In winter the microclimate in the lake area will be warmer than in the surrounding area, because the lake gives off the heat it has stored to the atmosphere which becomes warmer.  The extension of the area concerned depends on the volume of water that the dam can hold  back.

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