Storm water (or other runoff), as it flows across hard surfaces such as concrete, asphalt pavement, or roofs picks up sediment, pet wastes or other pollutants such as lawn chemicals, automobile oil and grease, airborne dust and construction site soil and rock.
(it; flows; across hard surfaces such as concrete, asphalt pavement, or roofs) (Storm water (or other runoff), as it flows across hard surfaces such as concrete, asphalt pavement, or roofs; picks up; sediment, pet wastes or other pollutants such as lawn chemicals, automobile oil and grease, airborne dust and construction site soil and rock)
it Storm water (or other runoff), as it flows across hard surfaces such as concrete, asphalt pavement, or roofs
flows picks up
across hard surfaces such as concrete, asphalt pavement, or roofs
sediment, pet wastes or other pollutants such as lawn chemicals, automobile oil and grease, airborne dust and construction site soil and rock