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What happens to rain water if there is no porous material under the slab for it to percolate through?

April 26, 2017happens material percolate porous rain slab water

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What happens to rain water if there is no porous material under the slab for it to percolate through?

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If the rain water can not percolate into the ground, then it will either pond on the surface and eventually evaporate or it will run off via overland flow to a storm sewer, detention basin, surface water body or some area of the ground where infiltration is possible.