Mayon Volcano is an active volcano located in the southern part of Luzon Island, Philippines. It has erupted 44 times since 1616 based on existing records, generating huge amount of unstable sediment. Therefore, lahars and debris-flows often occur on its slope and attack the residences around it. Pawa-burabod River, running down the south-eastern slope of Mayon Volcano, is pointed out as the most dangerous river. Debris-flows running through the Pawa-burabod River has caused severe disasters

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... y times and the sediment from the river is raising the bed of the Yawa River which in turn is flowing through the urban area of Legaspi City. In addition to this, Bonga pyroclastic flow avalanche fan, which was formed during the 1984 eruption, is closely located to the upper reach of the Pawa-burabod River. So, it is feared that the fan would be a huge sediment producing source when it joins the river by means of erosion.