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On 10-Apr-2006, wrote:

There are some fair sized
rollers in the lower canyons, but they were easily avoided when we were
there.

There's a lot of variation in what the Nahanni can throw at you depending on
water levels. I would not recommend skipping a cover in the lower canyons
unless you plan on portaging. Two weeks before I paddled the Nahanni, the
water level in the lower canyons was about 15 feet higher than when I was there.
That's pretty extreme, but that's what kind of changes can happen over a
relatively short period of time.

Tandy Leather has the snaps.

Some canoes use a webbing strap run all round the canoe about 4-6 inches
below the gunnel. Webbing straps on the cover run under this strap and
back up to a ladderlock to tighten. More complicated to outfit the canoe initially,
but the end result is more reliable than snaps and easier to put the cover on if
it's tight.

A properly designed and installed cover is pretty waterproof - the only place
for the water to get in is the opening for the paddler. They are not much of
a risk for entrapment.

Mike