Wendy:
Is New Zealand changing its _political boundaries_ to match
watershed boundaries? Or establishing zones along watershed
boundaries in addition to the political boundaries? If the former,
that would be really progressive! The latter (two overlapping sets
of boundaries) has been done, and it's a bear to work with. When
you use watersheds to establish planning areas, pollution control
districts, etc., it works well with nature; but it splits up
counties and makes it difficult to coordinate (differing local
ordinances to deal with, multiple district contact persons for some
counties, etc.) Florida has five water management districts along
watershed lines, which won out over political boundaries after a
heated battle in the '70s, I'm told.
Al