Virginia DEQ Storm Water Management (SWM) Inspector Practice Exam

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What role do swales play in stormwater management?

Increase evaporation rates

Convey and treat stormwater runoff

Swales play a significant role in stormwater management primarily by conveying and treating stormwater runoff. These planted, vegetated channels are designed to slow down the flow of stormwater, allowing for sediment and pollutants to settle and be filtered out before the water reaches larger water bodies or drainage systems. The gentle slope of swales encourages infiltration into the soil, which not only reduces surface runoff but also aids in groundwater recharge.

The design of a swale ensures that it can handle stormwater efficiently, helping to manage water quality by naturally capturing and treating contaminants that may be present in the runoff. By integrating vegetation and soil into their structure, swales enhance the natural processes of filtration and absorption, which is crucial for effective stormwater management.

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Store excess rainwater

Act as barriers to flooding

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