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<br />e <br /> <br />. <br /> <br />Glossary <br /> <br />Abrasion . Removal of strearnbank material due 10 entrained sediment, ice, or debris <br />rubbing against the bank. <br /> <br />Accretion. The natural building up of streambank by the river depositing sediment, <br /> <br />Aggradation (bed) - A progressive buildup or raising of the channel bed, flood plane, or <br />other surface due 10 sediment deposition. Aggradation is an indicator that a <br />change in the stream's discharge or sediment load characteristics is taking <br />place. <br /> <br />Angle of repose - The maximum angle (as measured from the horizontal) at which loose <br />materials can rest with stability. <br /> <br />Annual series - The discharge record composed of the greatest discharge each year <br />during the period of record. <br /> <br />Annor - A coarse layer of gravel or cobble that develops on a streambed through <br />winnowing away of fines. <br /> <br />Annoring . (a) Natural process whereby an erosion-resistant layer of relatively large <br />particles is fonned on a strearnbank due to the removal of finer particles by <br />streamflow. (b) Placement of a covering on a streambank or filter 10 prevent <br />erosion. <br /> <br />Articulated concrete mattress - Rigid concrete slabs usually hinged together with <br />corrosion.resistant wire fasteners; primarily placed for lower bank <br />protection. <br /> <br />Colorado Erosion Control Manual <br /> <br />XIII <br />