I started a thread on this some time back, but I cannot find it now, and anyway the answer was inconclusive if I recall correctly.
I came across this video just now:
http://www.youtube.com/watch?v=QAkSDGT5Xi4
It illustrates better than I did before (and with added dramatics!) about this mystery pipe, which now is more visible than ever due to the drought, exposing a rather attention-getting elbow, to boot.
Anyone know what it is?
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