CHANNEL RESTORATION IN AN URBAN SALMONID
STREAM (CONT.)
SOLUTION
There was much discussion concerning the proposed design
of the structures being considered. Because of the unique
sediment and flow dynamics of this area of the creek, it was
difficult selecting a structure(s) that would be compatible
with the existing geomorphology. For this reason, an
alternative plan of action was developed and was approved
by the project manager from Cantara.
The alternative plan not only provided better fish habitat,
but also achieved other important objectives relating to water
quality, public safety, and education. This proposal
involved removal of the median sandbar, a slight realignment
of the channel, reshaping of the high eroding streambank,
installation of streambank habitat structures, and planting
riparian vegetation. The realignment included meanders,
flood terraces, pools, and habitat features consistent with
the design stream type. The unstable right bank was
considered unsafe to visitors and was still a large source
of sediment as soil continued to slough off into the creek.
Realignment and re-sloping of the bank would reduce both the
safety threat and erosion.
SWAG applied for an EPA “5 STAR” grant to fund
this work, realign the stream, and provide a more natural
channel base for installing habitat structures. The
$3000 received from the Cantara Trustee Council was added
as a partnership fund for a cash/in kind contribution.
With the $20,000 requested from the 5 STAR Program, the partnership
funds from Cantara, and matching contributions from Shasta
College and other volunteers, the total cost of this project
was estimated at $53,540. Unfortunately, SWAG did not
receive this grant.
However, through volunteer efforts supported by SWAG, Shasta
College, and Turtle Bay, the project was implemented in October
1999 without the grant. The only part of the project
plan that was found to be impossible without funding was the
complete re-conformation of the high vertical bank.
With the aid of the Shasta College Watershed Restoration students
and Heavy Equipment students, the rest of the plan seemed
feasible to complete with volunteer labor. The $3000
contribution from Cantara would be used by the project contractor,
Shasta College, for equipment fuel. Despite short time
constraints, all additional needed permits were acquired within
a 30 day period.
PROJECT GOALS
The objectives of the project were as follows:
- Rebuild the vertical right bank to a stable slope and
as high as possible using the material excavated from the
median sandbar, and revegetate the bank with riparian and
native plants.
- Realign and reconfigure the stream reach to a stable
alignment, meander, and cross-section, and restore natural
floodplain processes.
- Install stream habitat structures and revegetate the
riparian area.
- Provide educational and interpretive opportunities on
salmonid habitat, stream restoration, and natural resource
management.
The project was designed to accomplish these objectives by re-locating
the stream away from the eroding stream bank. The new
alignment was designed and constructed using natural channel
design principles to create a vegetated meandering alignment,
a stable natural cross-section, and various fish habitat features.
The designed stream channel was located approximately 10 m (30
ft) east of the present channel.
The most significant goal of the project was to restore the
proper stream function and form along this critical reach.
Another primary objective of this project was to provide educational
opportunities in stream restoration and natural resource management.
To accomplish this objective, the project utilized the Shasta
College students and instructors for both project design and
construction. Also volunteering were students from Sequoia
Middle School, who assisted with planting and other project
tasks. According to the revegetation plan, students
and volunteers would continue to plant riparian vegetation
throughout the project area as needed. A monitoring
plan was also developed, and the success of the project would
be monitored for several years.
Figure 2. Restoration Plan.
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