86EAdditional matters relating to Tier 3 water sharing arrangements

86E  Additional matters relating to Tier 3 water sharing arrangements  (1) The Basin Plan must also:  (a) specify the conditions under which, due to one or more of the circumstances referred to in subsection (2):  (i) Tier 2 water sharing arrangements cease to apply; and  (ii) other arrangements (Tier 3 water sharing arrangements), provided for in the Agreement, commence; and  (b) specify the conditions under which Tier 3 water sharing arrangements cease to apply and Tier 2 water sharing arrangements recommence.  (2) For the purposes of paragraph (1)(a), the circumstances are:  (a) there are extreme and unprecedented low levels of water availability in the River Murray System; or  (b) there is extreme and unprecedented poor water quality in the water available in the River Murray System to meet critical human water needs; or  (c) there is an extremely high risk that water will not be available in the River Murray System to meet critical human water needs during the next 12 months.