Stream Restoration and Trout Habitat Improvement - Natural Channel Design Philosophy
ERC firmly believes in employing a natural channel design to stream restoration
and in development of trout habitat improvements. Based on completion of over 35 stream restoration projects in Colorado
and the west we have found that the only true way achieve successful
stream restoration is to mimic natural channel
design form
and function. Maximum trout holding capacity and angling diversity is achieved when adequate food and
sheltered are provided year-round. Riffle-pool complexes, bend pools, glides and runs are all common natural
forms associated with the most healthy productive streams and fisheries, not artificial boulder
structures. Our work aims to replicate these ideally functioning natural features using proven techniques
that are structurally stable, ecologically balanced and aesthetically appealing.
A properly functioning stream and riparian system supplies clean water, supports a variety of aquatic and
terrestrial life forms and provides an efficient, stable method of controlling flows and transporting water
and sediment. Natural streams exhibit a dynamic equilibrium. While continually changing, the forces of
hydrology, geology and topography create a natural stream alignment and gradient. Channelization, flow
diversions and development in the watershed affect this natural balance. ERC understands the importance of
regaining this balance. Stream shape, depth, width and gradient are evaluated as part of the
natural channel
design process and solutions are determined that reestablish stream equilibrium.
ERC approaches stream restoration and trout habitat improvement projects using a watershed-based
concept. Identifying changes in the watershed that impacts the health of a stream allows ERC to implement
resource management methods and stream restoration measures that restore native functions and values of the
riparian corridor.
The photograph below shows an example of stream restoration and trout habitat improvement project on the Blue River completed by ERC using the
natural channel design outlined above.
Enlarge image.