Repairing and preventing soil erosion - Soil Essentials: Managing Your Farm's Primary Asset - page 124

Stream erosion . Protect eroding banks using groynes built out from the bank
into the water to reduce water speed next to the bank and help trap silt. Batter
banks and plant trees with strong fibrous roots, such as casuarinas, to hold the soil
in place. In fast-f lowing streams or rivers, place rock against the bank to absorb the
energy of the f lowing water.
Sand drifts . In coastal sand dunes subject to constant strong winds, the only
way to protect them is to cover them with a thick mulch (such as branches of
shrubs) and revegetate the area with grasses and/or shrubs and/or trees. The area
needs to be regularly checked for 'blowouts' that should be covered and replanted
as soon as possible. Large areas of drifting sand such as large dunes or long ridges
are virtually unstoppable unless they can be stabilised with vegetative cover.
Landslips. Once a landslip has happened, it may become relatively stable, or
may continue to slip on steep country in high rainfall areas. Treatment is usually
achieved by establishing deep-rooted vegetative cover in the slip itself and in
adjacent areas. If the problem is caused by water travelling down aquifers, then
extensive revegetation may be required. It may also be helpful to put in
interception banks on a slight grade (0.5%) to divert water from above the slip
area.