Question

Explain how replacing asphalt with gravel or other permeable material can improve water quality.
in small paragraph

Answer 1

Replacing asphalt with gravel or other permeable materials lets rain soak into the ground instead of running off the surface, which reduces the volume and peak rate of stormwater reaching streams and sewers. As water infiltrates, soil, vegetation and the gravel matrix physically filter out sediments and trap oil, heavy metals and other pollutants while microbes in the soil break down some organic contaminants, so fewer pollutants reach downstream waters. This also recharges groundwater, reduces erosion and lowers thermal shock to aquatic life from hot runoff—overall improving water quality compared with impervious asphalt.