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However, channelization often makes things worse in the long run. By increasing the velocity of water moving in the channel, the flowing water scours the stream bed and deepens the channel (Figure 8.1b). The banks get higher and often more unstable. 

Channelization increases stream bank erosion, more sediment enters and clogs the stream. In addition, channelization reduces the amount of vegetation along the stream bank, which means less food and cover for wildlife. Increased sedimentation makes it difficult for some fish to feed and spawn, and the increased velocity of the stream drives out fish that cannot tolerate fast-moving water.

River channels are fundamentally conduits for water and sediment, but the specific processes of water and sediment movement vary widely among channels. These processes create unique habitats and patterns of nutrient exchange to which the local in-channel and floodplain communities of plants and animals are adapted.