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<br />Table 3.2. <br /> <br />001622 <br /> <br />The detailed habitat types and the eight general categories used by <br />researchers on the San Juan River (Source: Bliesner and Lamarra 2000). <br /> <br /> <br />Backwater Habitats <br /> <br />LowwVelocity <br />Habitats <br /> <br />Other Habitats <br /> <br />September 2000 <br /> <br />Backwater <br /> <br />Backwater pool <br /> <br />Embayment <br /> <br />Debris pool <br /> <br />Eddy <br /> <br />Edge pool <br /> <br />Pool <br /> <br />Riffle eddy <br /> <br />Rootwad pool <br /> <br />Abandoned <br />channel (dry) <br /> <br />Boulders <br /> <br />Cobble bar <br /> <br />Typically an indentation of channel below an obstruction. water depth from <10 em to > <br />1.5 m, no perceptible flow. substrate typically silt or sand and silt Occurs at mouths of dry <br />secondary channels and tributaries, lower ends of eddy return channels. mouths of dry <br />scour channels, and behind debris. <br /> <br />Same as backwater except maximum depth >2 m. <br /> <br />Similar to backwater but formed when water pools up at upstream end of secondary <br />channel with little or no outflow into the secondary channel. <br /> <br />Same as pool, except organic debris such as tree limbs or tumbleweeds in pool. <br /> <br />Same as pool, except water flow usually evident (but slow) and direction typically opposite <br />that of channel or circular. <br /> <br />Same as pool, except along shore and typically present downstream of shoreline or <br />instream obstructions. <br /> <br />Area within channel where flow is not perceptible or barely so; water depth usually :?:30 <br />em; substrate is silt, sand, or silt over gravel, cobble, or rubble. <br /> <br />Area adjacent to riffle where water velocity slow to moderate (5-1 0 em/see) and flow often <br />circular. Substrate sand, gravel, or cobble. Depths usually about same as adjacent riffle <br />or slightly deeper. <br /> <br />Pool formed by areas of rootwad piles; typically found along river margin. <br /> <br />Non-flowing secondary channel. <br /> <br />Large (>30 em diameter) rocks in channel. <br /> <br />Bar of exposed substrate consisting primarily of cobble, usually found within the river <br />channel but may be located along river bank. <br /> <br />Irrigation retum Channel where water is returning to river after application to agriCUltural fields. <br /> <br />Island <br /> <br />Isolated pool <br /> <br />Rootwad pile <br /> <br />Sand bar <br /> <br />Tributary <br /> <br />Dry, typically vegetated area of land surrounded by water and located within the river <br />channel. <br /> <br />Small body of water in a depression, old backwater, or side channel that is isolated from <br />the main channel as a result of receding flows. <br /> <br />Woody debris located within river channel. <br /> <br />Same as cobble bar but composed primarily of sand or silt substrate. <br /> <br />Tributary channel with flowing water entering main river channel. <br /> <br />3-17 <br /> <br />Program Evaluation Report <br />