bog burst

SIC 4th biennial flood report

Floods

The burns of Shetland are often short and steep, making them susceptible to flooding whenever intense rainfall is focuses on small drainage basins. The ability of the peat to absorb and hold water is also a factor. On steep slopes, sodden peat may fail to give bog bursts and debris flows, as the Channerwick flood of 2003. Evidence of localised flooding of burns is preserved along many stream courses where the peat contains layers of gravel mobilised during high flow.

Braewick beach. The burn mouth is choked by beach gravel thrown up in storms but periodic flooding along the burn cleans out the debris. The interbedded peat layers offer the possibility of dating the flood events