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There are homes on the mountainside with impervious surfaces and sewers.

It is also limited to sites where coverage of impervious surfaces is greater than 40%.

The street has 11% less impervious surface than a regular street.

In 1999, a study estimated that impervious surfaces covered 54 percent of the watershed.

Given the chance, he said, the board might have suggested using a less impervious surface.

The storm didn't leave it time to run off the flat, impervious surface of the basalt.

Urban runoff from roads and other impervious surfaces is a major source of water pollution.

The cleanup plan permits capping the site with an impervious surface.

Almost the whole basin is built upon which has increased the amount of impervious surfaces leaving no absorption area for rain.

Areas with low levels will be capped with an impervious surface.