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<br />- <br /> <br />- <br /> <br />--.- <br /> <br />--- <br /> <br />Glossary <br /> <br />- <br /> <br />---- <br /> <br />--- <br /> <br />Abrasion - Removal of streambank material due to entrained sediment. ice. or debris <br />rubbing against the bank. <br /> <br />Accretion - The natural building up of strcambank by the river depo~iting sediment. <br /> <br />Aggra<llation (bed) - A progn,ssivc buildup or raising of the channel bed, flood plane. or <br />other surface dill' to sediment deposition. Aggradation i!, 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 a.ngle (as measured from the horiwntal) at which loose <br />materials can rest with stability. <br /> <br />Annual ,;eries - The discharge record composed of the greatest discharge each year <br />during the perio<l of record. <br /> <br />Annor - A coarse layer of gravel or cobble that develops on a streambed through <br />willllowing away of fim,s. <br /> <br />Annoring - (a) Natural process whereby an erosion-resisllmt layer of relatively large <br />particles is fonn,:d on a. streambank due to the removal of finer particles by <br />streamflow. (b) Placement of a covering on a str',ambank Of filter to prevent <br />erosion. <br /> <br />Articulated concrete mattJ'(,ss - Rigid concrete slabs usually hinge.d together with <br />corrosion-resistant wire fasteners; primarily placed for lower bank <br />protection. <br /> <br />Coloraclo Erosion Control Manual <br /> <br />XIII <br />