Concrete Flowline (CCFL) A swale is a depression created in the ground that carries water runoff by gravity away from damaging your home or property. Flowlines, a.k.a. “swales”, collect that “rushing water” and helps to control that water drainage by directing it to catch basins, drain boxes, and curb drains.
Swales are shallow, broad and vegetated channels designed to store and/or convey runoff and remove pollutants. They may be used as conveyance structures to pass the runoff to the next stage of the treatment train and can be designed to promote infiltration where soil and groundwater conditions allow.
Affordable: The average cost to build a swale drainage ranges from $0.50 to $1 per square foot or $5 to $15 per linear square foot, making this drain type one of the most affordable to install. Aesthetic appearance: Due to their inconspicuous appearance, swale drains can easily fit into your landscaping plans.
Swales ideally have a trapezoidal cross-section with a flat base, while drains have a shallow 'v'-shaped configuration (Figure 1). Swales and drains should be designed to convey the required run-off volume effectively, and be well vegetated to allow for seasonal slashing.
When should you not use a contour swale? Contour swales are not the tool you want to choose when the issue you are facing is too much water and oversaturation on your site. They are also best used on slopes that are 3:1 or less because that keeps your berm from getting too steep, causing further erosion.
Swales can slightly reduce impervious area and reduce the pollutant accumulation and delivery associated with curbs and gutters. Disadvantages of this technique include the possibility of erosion and channelization over time and the need for more right-of-way as compared to a storm drain system.
Reseed bare areas to avoid erosion. Be sure to water during the initial establishment period. Inspect and maintain or repair components. After rainfall, check the swale to ensure the water does not pond longer than 2 or 3 days after a rain storm.
The primary function is to convey stormwater runoff and there is minimal water quality benefit; however, rock lined and vegetated swales may decrease the velocity of water and facilitate some infiltration. Vegetated swales may have the added benefit of filtering stormwater as it flows through the swale.
You can fill the spaces with gravel or plant grass or other ground cover.
It's a more natural way to help drain yards to prevent flooding, puddling, and erosion. They can also be a great addition to your landscape by looking like a dry stream bed. You can see what swales can look like further down!
Like a trench drain, a swale is a surface water drainage device. However, it's a lot more subtle in terms of its appearance in the landscape. A swale is like a ditch, but it's broad and shallow, and usually covered or lined with turfgrass or other vegetation.
The uphill side of the house must have a drainage waterway (swale) to direct the water around the house. This drainage swale should be at least ten feet from the house and sloped to convey accumulated water away from the dwelling efficiently, and into a proper outlet.
0.5% is plenty for a concrete swale, I'd argue you could get away with 0.3%. My local jurisdiction is general fine with that. For concrete sheet flow I would say 0.5% is a bare minimum but ideally you're closer to 1%.
For a relatively flat yard, a swale will generally drop 1 inch for every 10 feet of length. If your yard is flat for 60 feet, and then drops several feet to the street, a swale starting in the back yard would begin at a depth of two inches and be 8 inches deep at the point where it reached the drop to the street.
If you have a drainage swale on your property, it's your responsibility to maintain it so that it functions properly. Improperly maintained drainage swales interferes with proper drainage flows that can result in property damage caused by slope failure, erosion, or excess storm-water runoff.
Every 5-10 years (as needed) • If swale loses infiltration capacity, replace the bio-engineered planting soil and vegetation. Poor grass health Your grass may be the wrong type for your shade and moisture conditions or it may be smothered by weeds. Remove dead or diseased grass and plant new vegeta- tion as needed.
🤔 Swales are shallow ditches usually found between the road and your front yard. These swales convey storm water to canals, rivers, ponds and lakes by gravity flow. Swales are designed and permitted to meet local and state water management standards at the time of construction.
Place rocks, gravel, mulch, and/or plants within the swale. Test the effectiveness of the swale by running water through your system.
Swales allow for temporary ponding or channeling water to storm drains, resulting in less street flooding, and also reduces the pollution of water bodies by filtering the runoff before it reaches a drain.
Swales are dug out and layered with hügelkultur that can be planted on top while water percolates back into substrate below. Berms are mounded to direct and keep water in the swale.
A swale is a gentle trench that slopes down and away from a home's foundation. With the trench in place, fill the swale with river rock and then line the edges with pea gravel to create an efficient and attractive water diverter.
Ridges are scroll bars that have been incorporated into the floodplain. Swales are the intervening low flow channels. These arcuate forms have differing radii of curvature, reflecting the pathway of lateral accretion.
The swale cross section should be trapezoidal in shape. The steepest permissible side slope of the swale should be 2:1 (Horizontal: Vertical).
If properly maintained, swales can operate effectively for 20-50 years, depending on the design type. Vegetated dry swales may perform properly for up to 50 years (Malvern Borough, 2013).