I understand that when water is exposed to atmosphere, it dries quicker. Why does it make somuch a big difference though? For example, if it just rained, the whole parking lot will be dry a few hours later, but areas under an umbrella or a tree will form puddles. It will also take it soo much longer for these areas to evaporate. Is there really that much more air flow when things are not under a cover?
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A cover does two things. First, it stops sunlight from getting down to the ground. This makes the ground cooler which makes water evaporate slower. Second, it stops water vapor from rising up. If water vapor can’t pass through the cover then it will condensate on the cover and drip back down. So it’s not just about air flow, it’s about stopping the movement of sunlight and water.
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