24. Control Streambank Erosion With The Willow-post
Method
Streambank
erosion occurs whenever the erosive power of a stream or river is
so great that it cuts large chunks of soil from the bank.
As the stream cuts deeper into the foot of the bank, the bank is
weakened and eventually collapses into the stream.
One
of the most economical and effective ways to control streambank erosion
on small streams is the willow-post method. It can be installed for
only $7 to $15 per foot, as compared to $50 to $200 per foot with
more traditional streambank erosion-control methods.
The
willow-post method controls streambank erosion through the installation
of native willow cuttings to stabilize the bank. The dormant posts
spout roots, and this root network binds the soil together, reducing
erosion. Cedar trees are attached to the lowest two rows of willow
posts to add stability to the lower bank.
The
willow-post method has been tested and proven effective in Illinois
under flood conditions, even when heavy spring floods carry ice floes.
The willows have remained at the water's edge, which is their preferred
environment. They have not spread upward into adjacent fields, nor
have they clogged the channel.
To
decide if you need to take action to control streambank erosion, make
site visits to the creeks that flow through your land. Starting upstream
from your property, walk the entire length of the creeks and identify
the locations and severity of streambank erosion sites.