Common Mistakes in Building Swales for Beginners?

Designing on the Wrong Contour Lines

When building a swale, it’s crucial to design it on the correct contour lines. This means identifying the high and low points on your land, as well as the areas where water tends to collect. A swale should be designed to follow the natural flow of water, rather than trying to force it to flow in a different direction. A good rule of thumb is to design your swale at a slope of 1-5% to allow for easy water flow.

Choosing the Right Liner Material

Using the wrong type of liner can lead to problems with your swale, including erosion and contamination. A good liner should be durable, waterproof, and able to withstand the elements. Some popular options include EPDM rubber, PVC, and butyl rubber. It’s essential to choose a liner that is specifically designed for use in swales, as these products are often more durable and long-lasting than standard liners.

Considering Seasonal Flooding

When building a swale, it’s essential to consider the possibility of seasonal flooding. This means designing your swale to handle excess water during heavy rainfall events. A good rule of thumb is to design your swale to hold at least 10% of the total rainfall on your property. This will help to prevent flooding and ensure that your swale is able to handle excess water. Additionally, consider installing overflow pipes or other drainage systems to help manage excess water during heavy rainfall events.