Environmental
What does 'impervious surface' mean in Oregon land use and environmental regulation?
AA surface that cannot be purchased by the general public
BA hard surface (concrete, asphalt, roof) that prevents water from percolating into the ground, increasing stormwater runoff✓ Correct
CA surface treated with hazardous chemicals
DAgricultural land that cannot be irrigated
Explanation
Impervious surfaces (pavement, roofs, compacted gravel) prevent rainfall from infiltrating the soil, increasing stormwater runoff volume and speed. Oregon cities regulate impervious surface coverage to manage stormwater, protect water quality, and reduce flooding. Portland's stormwater regulations and many Oregon cities' development standards limit impervious coverage and require on-site stormwater management.
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