Stream Corridor Restoration: Principles, Processes, by 15 Federal government agencies

By 15 Federal government agencies

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Additional resources for Stream Corridor Restoration: Principles, Processes, Practices

Sample text

This scale, in turn, interacts with the landscape scale, and so on up the hierarchy. Similarly, because each larger-scale ecosystem contains the one beneath it, the structure and functions of the smaller ecosystem are at least part of the structure and functions of the larger. Furthermore, what is not part of the smaller ecosystem might be related to it through input or output relationships with neighboring ecosystems. Investigating relationships between structure and scale is a key first step for planning and designing stream corridor restoration.

Even though specific features might differ by region, most stream corridors have a channel, floodplain, and transitional upland fringe. 1–12 Nearly all channels are formed, maintained, and altered by the water and sediment they carry. Usually they are gently rounded in shape and roughly parabolic, but form can vary greatly. 12 presents a cross section of a typical stream channel. The sloped bank is called a scarp. The deepest part of the channel is called the thalweg. 11: A cross section of a river corridor.

Single-thread streams are most common. Braided streams are uncommon and usually formed in response to erodible banks, an abundance of coarse sediment, and rapid and frequent variations in discharge. A Longitudinal View Along the Stream Corridor 1–27 centerline length by the length of the valley centerline. 3, the stream can be considered meandering in form. Low to moderate levels of sinuosity are typically found in Zones 1 and 2 of the longitudinal profile. Extremely sinuous streams often occur in the broad, flat valleys of Zone 3.

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