Vegetation cover
Covering the sediments with vegetation is an efficient and inexpensive way to retain
them before they reach the river system. This can be done after 2-3 years, once the
sulphuric gases have disappeared. Volcanic sediments are fertile, so the vegetation will
grow readily.
Apart from the purpose of retaining sediment, it is also important to restore vegetation
lost during pyroclastic flows. This can begin shortly after the eruption has ended.