A dijkgraaf (lit. 'dike-warden, dike-reeve'), sometimes called a watergraaf, is the chair of a Dutch water board. He or she is the equivalent of a mayor in local government and a King's Commissioner in provincial government, chairing both the legislative and executive council, while having both ceremonial and representational roles as well as their own portfolios. The term goes back to pre-medieval days. 1. * National 2. * Provincial 3. * Municipal 4. * Water boards.