Question

building roads reduce...... of water by the soil

Answer 1

Building of roads reduce absorption of water by soil .
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Answer 2

Building roads reduce absorption of water by the soil and concrete has permeable layer over the surface and you can make up of large pebbles so water can drain almost instantly with no trouble of it.

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This new material called the top mix permeable which allow water to soak via to the ground in a fine manner.