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and desynchronize peak flow conveyed by the riverine ecosystem; the meals chain and nutrient cycling of both ecosystems are intertwined; the cultural and heritage values of riverine and riparian ecosystems are intimately linked. Modifications similar to flow regulation and channelization make the stream environment extra uniform, and restoration necessarily involves maintenance or recreation of the original patchiness. The dynamic equilibrium concept contrasts sharply with the concept of “stabilizing” a stream channel to avoid loss or harm to buildings or agricultural fields. A farmer is probably not comforted by the truth that the soil washed out of his stream bank is constructing new land, within the form of a point bar, on his neighbor’s property downstream. The identical highway department that builds a comparatively low-cost, slender span over a stream channel could also be preoccupied with the following downside of defending a bridge abutment from being undermined by scour, somewhat than contemplating the more permanent resolution of spanning the entire floodplain width that will be actively reworked by the channel through the life span of the bridge. world (Leopold et al., 1964; Welcomme, 1979). This annual disturbance could also be essential in maintaining the present system, simply as fireplace is necessary in sustaining prairies. In a gravel-mattress stream, the flood may flush the buildup of fine particles out of the interstices, thereby restoring the spawning habitat for trout or salmon . Restoration of the move regime is among the most uncared for aspects of stream and river restoration. In an open ecosystem, like an open financial system, supplies and energy are exchanged across the boundaries of the system in addition to within the system. In a closed system, the proportion of transboundary exchanges is small in relation to activity inside the system. A river or stream is open as a result of a relatively massive proportion of the supplies and power come from the encompassing terrestrial system, with the land-water boundary serving as a valve or filter that controls the trade. Achieving restoration, outlined in Chapter 1 as a return of an ecosystem to an in depth approximation of its predisturbance situation, requires having some idea of

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