Fluther: How come after it rains some concrete walkways are wet while ...

How come after it rains some concrete walkways are wet while others are dry?

Asked by AstroChuck (37609

) November 11th, 2008
6 responses
“Great Question” (2

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Have you ever noticed that? Is it that some are more porous than others?

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Topics: rain, concrete, cement, wet, sidewalks, walkways, dry

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Answers

That would be my bet. I see it too.

jrpowell (40562

)“Great Answer” (2

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I would agree. It has something to do with different types of cement. It might also have to do with relative ground temperature, shade/sunlight, airflow (near windy alleyway vs. next to building).

Ooo, and let me go for an obvious answer; some are dry because there is a canopy over them. XD

Yeah, I think your right though, that probably has something to do with it.

TheBox193 (997

)“Great Answer” (1

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I was all set to be like cause some of them have trees directly above them.

But yeah, I’m gonna go with porous.

asmonet (21445

)“Great Answer” (1

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The way I see it, if you have X inches of water, it will sink to be Y inches from the bottom of the concrete. More concrete in a single location will mean that the water is farther from the surface making it look dry.

ryanfaerman (109

)“Great Answer” (1

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