SM OR Drainage
in recently deposited alluvium above stream level, fair to poor in older alluvium where permafrost has developed and where covered by silty colluvium and peat. Good in younger permafrostfree terrace deposits without significant cover of organic silt. Drainage may be inhibited on older, inactive surf...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.383.5062 http://www.arlis.org/docs/vol1/F/820462234.pdf |
| Summary: | in recently deposited alluvium above stream level, fair to poor in older alluvium where permafrost has developed and where covered by silty colluvium and peat. Good in younger permafrostfree terrace deposits without significant cover of organic silt. Drainage may be inhibited on older, inactive surfaces mantled by appreciable thicknesses of silt and organic materials. Variable, depending on proportion of silt- and claysized material and stage of permafrost development. Deposits on or at the base of steep slopes may be subject to snow avalanches and torrential flooding during periods of snowmelt or heavy precipitation. Highly variable depending on stage of permafrost development. Ve ry poor in frozen deposits. Ve ry poor, often with standing water. * Source of geologic units: Szumigala and others (2002) |
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