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<br /> <br /> <br /> <br />6 <br /> <br />Photo 8: Loss of riprap and slope erosion (Montana DNRC) <br />Slope Erosion: <br /> Causes: Rain, snow melt, ponding on crest, poorly <br />maintained crest, vehicles/animal trails, sparse <br />vegetation <br /> Consequences: Erosion can create gullies, which <br />lead to over steepened area and stability issues <br /> <br />Photo 9: Slope erosion and sparse vegetation (AECOM) <br />Animal Burrows: <br /> Causes: Water and vegetation attract wildlife <br /> Consequences: Preferential seepage paths, <br />erosion, and loss of freeboard <br /> <br />Photo 10: Animal burrow (Montana DNRC) <br />Crest <br />Desiccation/Transverse/Longitudinal Cracking: <br /> Causes: Clay material shrinks as it dries, <br />differential settlement of embankment or <br />foundation, weak embankment material, slide <br /> Consequences: Shortens preferential seepage <br />path, seepage paths through cracks can lead to <br />internal erosion, slides <br /> <br />Photo 11: Transverse crest crack (ASDSO) <br /> <br />Photo 12: Longitudinal crest crack (Montana DNRC) <br />Sinkhole: <br /> Causes: Collapse of embankment material into <br />piping hole or animal burrow, settlement over <br />outlet works conduit <br /> Consequences: Could represent serious piping <br />problem in the embankment leading to failure <br /> <br />Photo 13: Crest sinkhole (ASDSO)