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pure tendencies of rivers are predictable, based on their morphology, substrate, surrounding landforms, and move rates. So profitable was the work on the San Juan River that a new river stabilization project was quickly approved and was undertaken by Rosgen on the nearby Blanco River in southwestern Colorado in 1987 . Removal of willows by burning and plowing the bottomland along the river in the early Nineteen Thirties led to the creation of an unstable, braided river channel that migrated back and forth throughout the valley ground. Without willows to hold riverbank soil, the river eroded its banks, washed away valuable land, and became extensive and shallow. Damage was carried out to roads and irrigation buildings. Water high quality suffered. 7. Preserve, restore and intensify the 2 commonest natural traits of streams-the meandered channel profile and the riffle/pool sequence. 2. Maintain or enhance base flow each time possible . Riparian zone and whole watershed administration activities ought to be thought-about to achieve greater and more steady base move. When this work is completed without a profound understanding of the interactions amongst stream hydrology, fluvial geomorphology, and fish, the least detrimental consequence could also be that mechanical buildings emplaced within the stream at considerable expense and hassle might be of limited durability and longevity. Much stream work at present and prior to now has been directed at bettering the welfare of salmonids (Table 5.7). An abundance of technical and in style literature attests to the effectiveness of well-deliberate and well-executed stream enchancment projects in increasing the standard and amount of trout and salmon production . Sometimes, however, this work has been done at the expense of other members of the aquatic neighborhood, such as beaver (Flick, n.d.). depends on hydraulic forces to effect restoration. Flows that reshape channels or flush fine particles out of gravel beds might not occur yearly, or only some times a year, so it may take several years before the desired end level is achieved. When the dam was removed on the Milwaukee River in West Bend, Wisconsin (see Box 5.7), it took 6 months for the river to scour much of the
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