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The first impressions of fans
can be that they are excellent
opportunities for logging,
clearing for farms, building
roads and locating
communities. These gently
sloping conical deposits of
sediments form where
streams lose confinement.
They appear as an oasis of
opportunity in mountainous
and hilly terrain. Such is the
case across British Columbia.
However, experience has
proven time and again that
these landforms present a
range of significant hazards. Periodic debris flows
and floods spread sediments and water well beyond the
unvegetated channel. Seemingly innocent excavations into
the gravel channels quickly become deeply entrenched
gorges. Streamside vegetation clearing leads to channel
widening with de-watering of the shallow channel as
summer progresses. Fans in British Columbia are
very definitely a hazard for human developments, but
we generally recognize this too late. As there are
disturbed fans throughout B.C., it would also appear
that we don’t seem to “learn our lessons”.
Underhill, Donna (editor). 2002. Streamline; Vol. 6; No. 3; Winter 2001/02. Ministry of Forests; Watershed Restoration Program; Ministry of Sustainable Resource Management; Ministry of Water, Land and Air Protection. Streamline. Vol. 6. No. 3
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