What Is a Swale?

A swale is a shallow, vegetated depression designed to channel and absorb stormwater.

Key features:

• Typically found between properties or along roadsides.
• Helps reduce runoff velocity and promote infiltration.
• Filters pollutants like sediment, oil, and nutrients.

Resident tips:

• Keep swales clear of debris, grass clippings, and trash.
• Avoid compacting soil or paving over swales.
• Plant native grasses to enhance filtration and reduce erosion.

What Is a Bioswale?

A bioswale is an engineered swale with native vegetation and amended soils to improve water quality.

Benefits:

• Removes heavy metals, hydrocarbons, and nutrients.
• Supports pollinators and native wildlife.
• Reduces peak stormwater flows and downstream flooding.

Examples in Delray Beach:

• Bioswales are installed near parking lots and public parks.
• Integrated into green infrastructure projects to meet low-impact development (LID) goals.