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26 <br />IP (Isolated Pool). A backwater pool with access to main channel <br />blocked. c <br />PU (Puddle). Isolated on-shore bodies of water created by falling <br />water levels, not cutoff secondary channels. <br />III. Substrate <br />SI (Silt). Fine gritty material that is suspended easily. <br />SA (Sand). Less than 1/10 inches in diameter. (<3 mm). <br />CL (Clay). Compacted fine particles in bed form that are not <br />suspended easily. <br />OR (Organic Debris). Muck derived from dead decaying matter. <br />GR (Gravel). 3/8 to 3 inches in diameter (3 mm to 76 mm). <br />RU (Rubble). 3 to 12 inches in diameter (76 mm to 305 mm). <br />B~ (Boulders). Individual segments of rock larger than 12 inches <br />in diameter (>305 mm). <br />BE (Bedrock). Large solid masses of rock without individual form. <br />IV. Cover <br />V (Vegetation). Living emergent vegetation as cover. <br />B (.Brush). Dead plant material, such as Russian thistle and <br />tamarisk or other brush which may provide cover. <br />R (Rock). Cover as gravel, rubble and/or boulders (correlated <br />with substrate). <br />~ (Overhang). Overhanging cliffs and/or ledges which may shade <br />the water at certain times. <br />T (Turbulence). Surface disturbance or turbulence which may <br />provide cover. <br />S (Shade). Cover provided by riparian vegetation which may <br />shade the water at certain times. <br />D (Debris). Cover provided by accumulations of fine aquatic and/or <br />terrestrial organic matter. <br />N (None). No observable structure, irregularities, etc. <br />.~ <br />