http://wiki.openstreetmap.org/wiki/Tag:man_made%3Dstorage_tank
http://wiki.openstreetmap.org/wiki/Tag:man_made%3Dreservoir_covered
see also tank_pnt and resvr_poly layers
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uploaded by HB for the mainland 19 jan 2011 in changesets 7016532, 7016549, 7016555, 7016627, 7016659, 7016968, and 7016989.
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HB 21 Aug 2012: field names updated for new data release. Tested & approved for Antarctica. The mainland was already done in V16.