When it rains, rainwater flows down hillsides and
mountain trails, from high to low areas catching loose soil in the
process. When the runoff generates
enough momentum, soil erosion becomes greater. In severe cases, gullies form immediately.
One method of reducing soil erosion is to build
drainage ditches on different sections of the mountain trail, to disperse and
impede the water’s momentum.
According to the “hand-made trail” manual, there are various methods to make drainage ditches. However, the natural surrounding usually dictates the design and construction process. A typical example is to reinforce the sides of the drain with rocks or logs. Then cover the base with pebbles to slow down rainwater and make sure runoff disperses to the trail’s edges where there is vegetation or soil.
what kind of material is used to build the drainage ditch, if the ditch
accumulates with garbage, foliage, sand or soil, it would be rendered useless. Hence regular ditch maintenance which includes
clearing out blockages is essential to a mountain’s overall conservation.