A hydro-electric district may be established so as to enable a water entity to undertake and manage works for a purpose referred to in section 193 or do any act, matter or thing for any such purpose or for any or all of the following purposes:

(a) measuring the flow or levels of water in, or the quantity of water taken by any person from, any watercourse or lake in the district;

(b) conserving and regulating water in watercourses and lakes and purifying and protecting that water from pollution;

(c) any purpose referred to in, or incidental to, a special licence relating to the hydro-electric district –

but only to the extent that that Act, matter or thing is consistent with the objectives of this Act.