The following are the purposes of this plan—
(a) to define the availability of water in the plan area;
(b) to provide a framework for sustainably managing water and the taking of water;
(c) to identify priorities and mechanisms for dealing with future water requirements;
(d) to provide a framework for establishing water allocations;
(e) to provide a framework for reversing, where practicable, degradation in natural ecosystems;
(f) to regulate the taking of overland flow water;
(g) to regulate the taking of groundwater.