OSM Page: http://wiki.openstreetmap.org/wiki/Tag:man_made%3Dpipeline
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RP: could someone add some logic to add layer=-1 if location=underground?
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HB: ok, layer=-1 test added. also sewage->sewer as per OSM wiki.
JOSM Validator found a bunch of "Illegal tag/value combinations, but I couldn't figure out why. All looks good to me. ?!
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Uploaded for the mainland Feb 23 2011 by HB in changeset 7370759.
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HB 22 Aug 2012: updated field names to match new dataset, no osm tagging changes.