Table 4.

Summary of road damage attributed to Typhoons Pepeng (October 2009) and Ompong (September 2018)

KmHazard typeImpact on road
Cut slope failureSlope failure aboveSlope failure belowWall failure belowErosion aboveErosion belowDebris flowDebris in side drain and adjacent carriagewayRoad blockedPartial failure of road widthEntire failure of road widthCracking, deformation or impact damage to pavementRoad edge exposed/underminedDamaged culvert and/or outlet protectionLength of failed or undermined pavement owing to ground movement (m)
Post Typhoon Pepeng damage summary using Google Earth imagery dated Dec 2009, Mar and Apr 2010 and Jan 2012
257–270No data1222Unreliable from satellite3Unreliable from satellite310
270–280101075
280–290000250
290–300000135
300–31000000
310–320300145
320–33010000
330–34000000
Post Typhoon Ompong damage from November 2018 field inventory
257–270100101010000108
270–2801300000130000000
280–290620000080000000
290–3001332016260113048
300–3107122121410130001397
310–32013153128111211311159
320–3301610330402130013274
330–340900101090000000

This table does not include reference to those areas of road subsidence that were active prior to these typhoons, namely at Pilando, Sinipsip and Sayangan (see text). It should be noted that, over the first 28 km, the observations from satellite imagery taken after Typhoon Pepeng failed to record two of the locations of partial road width failure and several of the locations of partial road blockage noted during a field reconnaissance made in May 2010. Otherwise, there was reasonable consistency.