Make A-frame to prevent soil erosion
Make an A-frame to mark out contours and prevent soil erosion:
Soil erosion is a serious issue in Southern Africa and the solution can be as simple as ploughing a field along the contour and not up and down the slope. In this way, water run-off is minimised and plants also get more water for growth. Identifying the contour lines in your field though is expensive, unless you make and use an A-frame and do it yourself. It worked for the Egyptians when they build the pyramids, so why not. Here is a Virtual Reality simulation that shows how to make and use an A-Frame.