"MC" wrote in message
om...
I plan on covering my pond (zone 5, Chicago) this winter with a solar
pool cover (it looks like bubblewrap). The question is how much area
do I need to leave open for gases to escape? If I leave 1" around the
whole pond, is that enough?

Any space that allows the naughty gases to escape will be adequate. My pond
is about 10x13, and my ice hole is only 8-10 inches across depending on the
severity of the day.

BV.