"Malcolm" wrote

Nick Maclaren writes

David Hill wrote:

Anyone who might flood or need to divert water might find this
interesting
product useful. We now have some from Travis Perkins Builders
Merchants but
hope we won't need to employ them. Missed the army delivery of
sandbags as
we were out! No I don't understand the logic either.

http://www.floodsax.co.uk/floodsax/

The hype is, as always, hype. They will have a density of about 1,
whereas sandbags will have a density of above 1.5 (especially when
wet). So they will work only if they are piled high enough that
the weight of the ones above the water holds the ones below the
water on the ground.

A neat idea, but you clearly MUST be aware that they need to be
piled 50% higher than sandbags to work at all.

Talking to a technical bod from a firm making water retaining polymer
last autumn, he reckoned that as a substitute for sandbags they just
weren't in the same league.
Sandbags every time.

If feasible. The point where those score is that you can store
them in a small amount of space, and don't have to rely on a
delivery of sand.

Someone was on the radio a couple of days saying that the problem with
sandbags is that they're better at filtering the water than actually
stopping it!

That is why you need something like a strong plastic sheet held by the
sandbags or between two sandbag walls to make a dam as we have seen locally.
--
Regards. Bob Hobden.
Posted to this Newsgroup from the W of London, UK