Swales and Earthworks for Water Retention in Australian Gardens

Understanding SwalesA swale is a level trench constructed along a contour line — not down the slope. When rain falls on the slope above, it flows along the surface and collects in the swale, where it sits long enough to infiltrate into the soil. The key word is "level" — a swale that has any slope will simply become a channel that drains water away faster.Designing SwalesUse an A-frame level, bunyip (water) level, or surveying equipment to mark the contour line. In areas with intense summer …