# Levee Design

<span id="bkmrk-%C2%A0"></span>[![Levees tool icon](https://docs.t3rra.com/uploads/images/gallery/2025-03/scaled-1680-/PAkimage.png)](https://docs.t3rra.com/uploads/images/gallery/2025-03/PAkimage.png)

**Levees** creates guidance lines at set elevations. These lines are also known as contour lines, level curves or isoheights. Levees can reduce erosion and runoff and promote water capture.

<figure id="bkmrk--2">![Levees design controls and elevation lines on the field map](https://docs.t3rra.com/uploads/images/gallery/2025-03/scaled-1680-/c1Dsfgbqiyoh1lpblzh9qrtwon1ehc4-wmk1w-png.png)<figcaption>Levees design pane and map.</figcaption></figure>## Working with levees

- Add levees at set intervals.
- Smooth levees.
- Delete selected levees.
- Apply levees selectively to field regions.
- Export levees as guidance curves for John Deere AutoTrac™.

<span id="bkmrk-%C2%A0-1"></span>## Split regions with levees

You can use levees to split regions. Use a small number of levees for splitting, as recommended. **Splitting regions at levees consumes those levees.** To create more levees afterwards, change the elevation or vertical interval for the best results.