NBS series: Keyline design

Keyline design is a land planning and management technique that originated from the work of Australian farmer and engineer P. A. Yeomans in the mid-20th century. The keyline design system is primarily used in agriculture and permaculture to optimize water distribution on a landscape, to promote soil health, and to enhance overall productivity. While it originated in Australia, the principles of keyline design have been applied and adapted in various regions around the world.

The keyline design approach focuses on identifying and working with the natural topography of the land to maximize water retention and distribution. The keyline refers to a contour line that represents the natural flow of water across a landscape. By identifying and mapping keylines, practitioners can design systems that capture and distribute water more effectively.

Key elements of keyline design

• Contour mapping: The process of mapping contour lines is crucial in keyline design. This involves surveying the land to identify the natural slopes and contours, enabling the placement of keyline features in harmony with the landscape.

• Keyline dam: Dams or ponds may be strategically placed along keylines to capture and store water. This helps prevent erosion, allows for more efficient water use, and provides a sustainable water source for plants and animals.

• Grassed Waterways: Planting grass along keylines helps prevent erosion and sedimentation, improving water quality and encouraging the natural filtration of water as it moves across the landscape.

• Tree Planting: Integrating tree planting into keyline design can provide additional benefits such as windbreaks, shade, and enhanced biodiversity.

Examples of keyline design