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result of dams deteriorate , sediments inexorably fill reservoirs, and human technology and human wants change. In establishing a 50-12 months maximum time period for licenses for hydroelectric plants, Congress recognized that public wants and interest change. When a license expires, the Federal Energy Regulatory Commission should decide how the public interest is best served (Echeverria et al., 1989). Between 1991 and 1993, more than 200 power initiatives, representing maybe greater than twice that mary dams will be due for license renewal (Echeverria et al., 1989). License renewals and structural deterioration each provide unique alternatives to revive pure functions of rivers by requiring structural or operating adjustments that allow fish migrations or profit different in-stream uses. In some cases, restoration of the free-flowing river by removing of the dam could even be feasible, although just a few such examples exist as but. The case research illustrates the usage of “delicate engineering” methods and pure supplies to fight stream and river degradation and bank erosion. Soft engineering methods restabilize river channels and banks without straightening them and without confining water flows in concrete or riprapped channels. Instead, this method requires study of the river’s pure hydrological and hydraulic tendencies and subsequent use of earth-shifting gear to return the fluvial system to a steady, naturalistic configuration. The redesigned and repaired stream or river channel is strengthened with pure materials, similar to rocks, logs, root wads, and live raparian vegetation, to assist preserve the brand new banks and channel. The function of the Willamette greenway as acknowledged by the Oregon legislature is to guard and protect the natural, scenic, and leisure qualities of the lands along the river, whereas preserving and restoring options of historic curiosity. Much land has been protected along the Willamette since the passage of the Greenway Act in 1967. In addition, the uses of private and non-private lands have been regulated under greenway guidelines, and five state parks have been established. Despite the achievements, the Willamette greenway should not be considered a perfect plan. Agricultural land is exempt from greenway regulations, and some residential growth and destruction of vegetation are occuring along the river within the a hundred and fifty-ft setback zone. Also, addition of new land to the
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