The hillside works are structural measures to prevent erosion due to rain and restrain sediment production by introducing vegetation into devastated slopes. If the surface soil remains on the hillside, the transition from herbaceous to arborous plants, called the succession of vegetation, will advance. But, if the surface soil migrates often, vegetation is unable to set in and take root. Hillside works are adopted to prepare a toehold for the introduction of vegetation.
- Translated from Journal of Japan Sabo Association, Sabou to Chisui, Vol.88, p.84, 1992