Rock Barriers
A barrier or series of barriers is often needed to reduce the
erosive power of water in steeply sloping waterways and in many
gullies so vegetation can be established. Erosion is reduced by
the flatter slope between barriers, and vegetation has a chance
to grow on the more level areas.
Slat/Brush Fences
To anchor brush barriers in place, two rows of posts are driven
vertically into the soil across the waterway or gully bed.
Loose branches or small trees are packed tightly in between the
rows of posts, making an impermeable barrier. The ends of the
brush piles should be dug into the channel walls and the soil
should be packed tightly around them. The top of the brush
pile normally is low in the middle so no water will flow around
the ends.
Log Barriers
Logs may be used to form barriers in larger gullies. Sturdy
posts are driven deeply into the channel sides and bottom as
for brush barriers. The logs often must be dug into the bottom
as well as the sides so they make firm contact with the soil.
Timber Barriers
Heavy dimension lumber or timber, or a series of thick posts
driven closely together can also serve as a barrier. Posts
should be driven vertically into the soil, deeper than the
length of the exposed part above ground so the force of the
water cannot overtop the barrier. Large thick pieces of
termite-resistant wood help guarantee the long life of the
structure.
Brick Barriers
Brick barriers can be used to stop gully erosion. A good
foundation such as poured concrete or layered rock is necessary
for any barrier built with bricks or blocks. This, along with
supporting butresses, should resist the force of the water
where the barrier meets the gully wall.