Mt. Pintaubo (Philippines) erupted in 1991 and deposited up to 6km cubed of pyroclastic material in the drainage basins of the volcano. One of these drainages, The Pasig Potrero, is a river system that flows off the eastern flank of the volcano. 14km downslope of the summit crater, the river expands into a wide, braided alluvium over half a kilometer in width. Dr. Karen Gran has been monitoring the Pasig Portero since the eruption to understand the evolution of the river channel as sand-rich pyroclastic deposits are eroded and transported downstream.
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