It doesn’t even need to be dripping directly onto the surface. I’ll give you an example: I’ve seen A/C condensate water coming out of the roof drains of a building, and you can see a clear path where the water eroded away the cement, leaving the concrete’s aggregate exposed. I know water can do some impressive things, (Grand Canyon) but how does the water flowing over the surface actually cause erosion? Let’s say the gutter of a roof is allowed to drip onto a concrete surface, how exactly does it wear it away give enough time?
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On top of the other answers, rainwater is almost always acidic from the CO2 in the atmosphere, and concrete is based on limestone, and therefore basic, and therefore the rain will eat into the limestone chemically, slowly, but remorselessly
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