The purposes of this plan are to—
(a) define the availability of water to which this plan applies; and
(b) provide a framework for sustainably managing water to which this plan applies; and
(c) identify priorities and mechanisms for dealing with the future water requirements in the plan area; and
(d) provide a framework for managing water allocations; and
(e) provide a framework for reversing, where practicable, the degradation of natural ecosystems caused by the taking of, or interference with, water to which this plan applies.