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~: <br />Table 1. B <br />ackwater habitat formation classification categones and descnptions. <br />~°' <br />Backwater Type Description <br />Secondary channel Habitats formed by the erosion/deposition cycle of secondary <br /> channels during passage of a flood, and revealed by receding water <br /> levels. Usually relatively deep and permanent. <br />Migrating sand wave Habitats formed by the relative movement of adjacent migrating sand <br /> waves. Usually shallow and ephemeral. <br />Horseshoe vortex Habitats formed by scour holes generated at high flows at the <br /> upstream ends of islands due to development of horseshoe vortex <br /> patterns. Moderately deep and semi-permanent. <br />Shoreline eddy Habitats formed by recirculating azeas due to irregularities of the <br /> bank. <br />Constricted reach Habitats formed by lazge eddies generated by constriction of the <br />eddy channel by debris fans. Usually at the downstream ends of rapids and <br /> rifles. <br />Isolated pool Habitats formed by any of the above processes which are completely <br /> disconnected from the river due to decreased flows. <br />Low velocity flow Habitats formed by any of the above processes, but which are not <br />. completely isolated from main channel flow, thus allowing very slow <br /> flow into the habitat across a restricted area. <br />Shoreline -Shallow areas directly adjacent to the shore with low to moderate <br /> flow. <br />10 <br />