Which outcome occurs when sediment supply surpasses transport capacity in stream outflow onto a low-gradient surface?

💡 Explanation

Alluvial fan deposition results from exceeding sediment transport capacity, because reduced flow velocity causes rapid sedimentation. This exceeds stream's ability to carry the load, therefore fans develop, rather than continued transport downstream to form floodplains.

• Which outcome lowers levee crest elevations during floods?
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• Which outcome is accelerated during episodic dome building?
• Which outcome results from increased freeze-thaw cycles on alpine sandstone?
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