Which consequence results from pyroclastic flow deposition during lahar formation?

💡 Explanation

Increased sediment supply into streams occurs; the pyroclastic materials are unconsolidated and easily eroded promoting debris flows, triggering increased discharge; this mechanism leads to high sediment load input, because pyroclastic material is highly erodible; therefore sediment-rich flows occur, rather than increased floodplain fertility.

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• Which mechanism causes increased stream erosion downstream of a dam following heavy precipitation?