lahars

Water from melting snow and ice mixed with loose rock debris to form volcanic mudflows called lahars that ripped trees from their roots and engulfed roads, bridges and homes.

Livescience.com 2010

The rock mixed with and melted snow and ice that had been carried from the peak, creating debris flows called lahars with the consistency of wet cement.

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Sediment delivery is greater and more persistent from basins with severely disturbed channels from lahars (volcanic debris flows) and pyroclastic flows than from watersheds mainly blanketed with ash-fall deposits.

volcanic ash hazards and ways to minimize them 2009

Water reticulation systems have been easily damaged by lava flows, lahars (which can be caused by rainfall and subsequent erosion of ash into rivers), earthquakes, and ground deformation associated with magma intrusion and eruption.

Volcanic Ash -- Effects on Water Supply and Mitigation Strategies 2009

Punongbayan, R.S. (eds.), 1997, Fire and mud: Eruptions and lahars of

Actions to take for ash fall? 2009

Water reticulation systems have been easily damaged by lava flows, lahars (which can be caused by rainfall and subsequent erosion of ash into rivers), earthquakes, and ground deformation associated with magma intrusion and eruption.

Volcanic Ash -- Effects on Water Supply and Mitigation Strategies 2009

Our Cook Inlet fisheries are at risk due to continued volcanic eruptions from Mount Redoubt and the associated lahars and extensive flooding that have resulted and will likely continue.

Shannyn Moore: UPDATEDPalin & Chevron; Spill Disaster in the Making UPDATED 2009

A Yellowstone supereruption, a Long Valley supereruption, the San Andreas lock-up NW of Los Angeles cutting loose, the Cascadia Subduction Zone lock-up cutting loose on the NW coast, and lahars (hot volcanic mudflows) from Mt. Rainier devastating the southern Puget Sound area (into Tacoma) without much warning and without signs of a conventional eruption stand out as one glaring possibility of multiples.

Yellowstone Supereruption 2007

About A.D. 500 people reinhabited the area and farmed there until sometime between A.D. 700 and 850, when a second eruption dumped more pumice followed by pyroclastic surges -- steam, gases, and volcanic material moving along the ground -- and massive lahars, mudflows laced with volcanic debris, that flattened anything in their path.

Godzilla's Attacking Babylon! 1999

Potential blast damage, heavy ash fall, and worse, huge lahars and pyroclastic flows that scour out and destroy everything in their path.

Yahoo! Answers: Latest Questions 2010