I seem to remember a zig-zag shape for a noise reducing wall (composed
of a suitable material), so that the sound waves cancel each other out
(in principle). The opposite effect is achieved in concert halls.
Rushing water is a good idea, I'll bet.
Best
George
On Fri, 21 Apr 2006 09:14:02 -0700, "Toby Hemenway"
<toby@patternliteracy.com> said:
Vegetation is not very effective at blocking noise unless it is dense and
20-40 feet wide. Ten feet of dense hedge helps some, but loud noises like
traffic, dog barks, or animated conversations will penetrate it easily.
For
an effective barrier, you'll need something solid. Two thin walls with an
air gap between is very effective.
Toby
..[snip]..
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