InstaBidsWhat is a swale?
A swale is a drainage channel that carries rainwater across the ground. A grassed swale slows runoff and can let water soak into the soil.
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How do swales function?
A swale receives runoff from nearby hard surfaces and gives that water a path through the landscape. Indian River County, Florida, explains that grass slows the water and helps particles settle; some captured water then soaks into the soil. “Generally, swales receive stormwater from adjacent roadways and other paved areas.” Source: Indian River County, Florida, Stormwater Division, read 2026-10-30.
What is Philadelphia's definition of a swale?
Philadelphia describes a swale as a grassy depression that controls how fast stormwater moves and allows absorption where the ground permits it. Its water department also describes swales carrying runoff from streets or sidewalks toward rain gardens or basins. “A swale is a grassy depression that controls stormwater velocity and infiltrates runoff where feasible.” Source: Philadelphia Water Department, read 2026-10-30.
Should a swale fill up with water during a rainfall?
Temporary ponding can be part of a swale’s intended function. Norfolk, Virginia, describes dry swales that store stormwater in a grass channel over an engineered soil mix before it soaks into the ground. Water in that channel during rain does not, by itself, establish that the swale has failed. “Dry swales rely on an engineered soil mix below a grass channel to temporarily store and filter stormwater.” Source: City of Norfolk, Virginia, read 2026-10-30.
How long should my swale hold water?
The expected drainage time depends on the kind of swale. Annapolis, Maryland, tells owners to look for drainage within 48 hours after rain in its maintenance schedule. That timing is local guidance, not a universal deadline: the same city describes wet swales that intentionally retain water for treatment. “Look for dewatering within 48 hours after a rain event.” Source: City of Annapolis, Maryland, read 2026-10-30.
Why is it important to maintain your swale?
A swale needs vegetation and a functioning flow path to keep doing its job. Annapolis, Maryland, identifies erosion or bare soil as a sign that runoff is moving too fast, vegetation is missing, or both. “The rainwater is moving too fast and/or vegetation is lacking or nonexistent.” Source: City of Annapolis, Maryland, read 2026-10-30.
Sources
- Swales — Green Stormwater Infrastructure — Philadelphia Water Department; read 2026-10-30.
- Swales Maintenance — City of Annapolis, Maryland; read 2026-10-30.
- Frequently Asked Questions: How do swales function? — Indian River County, Florida, Stormwater Division; read 2026-10-30.
- Environmental Regulatory: Dry Swale — City of Norfolk, Virginia; read 2026-10-30.