Erosion of Pathways
Don looked at a classic problem facing many people who have decomposed granite or gravel pathways in their gardens. If the path is built across a slope, run-off from rainwater or even an irrigation system could erode the path and wash it away.
Simple solution
Don does not recommend using coarse, loose gravels on steep areas. However if you are using a finer material, such as decomposed granite, mix 1-2 bags of cement to the tonne and then compact it using a vibrating plate. This gives the decomposed granite a crunchy skin on top, so it will last much longer and be less prone to erosion. (Note: many landscape suppliers will add the cement to the gravel for you, just before delivery.)