Since the beginning of the twentieth century, at
least 10 slush flows have been reported from the Dale valley, from both the
A-gil and the B-gil catchments: in 1925, 1975 (several slushes), 1981, 1991 (3
slushes), and 1994 (2 slushes). It is though uncertain if more slushes have
occurred during heavy snowmelt seasons, since local population give slush
events different appellations. Here we join the documentation issue raised by
Hestnes.>>
According to the documented slush-flow history, only
few months recorded slush-flow activity: 70 % of the events occurred in
January, 50 % in February, 15 % in March and 15 % in May. Slush-flow activity
has often been a serious threat to the village, causing heavy damages but no
human lives have been lost there.>>
·
The
slush flow on the 6th of February 1925 flows from the B-gil gully
and passed the local school building; the school principal was caught in the
flow and carried out to the sea, where he was rescued.>>
·
On
the 22nd of January 1975, several slush flows came down the B-gil
gully and caused severe damages to properties. On the same day 4 people where
killed by two slush flows in the town of Dalienafjord, close to the Dale area.>>
·
On
the 10th of May 1981, a slush flow occurred in the same path that
the 1925 event.>>
·
At
around 20:00 on the 28th of January 1991, a slush flow came down the
B-gil gully. The flow was diverted to the south by the upslope deflector and
the main part of the flow stopped about 75 m above the school building, but the
water body reached the fjord. At 21:45, another slush flow was released from
the A-gil gully. It flowed down the debris cone and the main part of the slush
stops on the main road, but the water body reached the sea. At around 22:00, a
second flow was released from A-gil gully. This flow was not as big as the former
one and stopped on the talus cone. >>
·
On
the 14th of March 1994, around 01:45, a slush flow fell down the
A-gil gully. This flow had a shorter runout distance than the one in 1991 and
stopped below the main road. Another smaller flow occurred around 03.21,
showing similar pattern as the year before. >>