"Martin" wrote in message
...
On Mon, 29 Nov 2004 12:18:30 GMT, Janet Baraclough..
wrote:

The message
from "Sue da Nimm" . contains these words:

The pond sides should always slope outwards so that any ice
formed cannot
exert sideways pressure when it melts. (Ice EXPANDS when it
melts, which is
why it can burst pipes)


Ice expands as it freezes and shrinks as it melts. The expansion
of
the frozen ice is what bursts pipes or vessels, not the melting of
it.

I am sorry, but you are usurping Franz's job.

Never mind, as long as Janet stays on message, her help with this
onerous task is welcome. {:-))

Franz