(a) The conservancy shall have, and may exercise, all rights and powers, expressed or implied, necessary to carry out the purposes of this division, except as otherwise provided.
(b) The conservancy may not levy a tax, exercise the power of eminent domain, or regulate land use except on lands it owns, manages or controls. The conservancy shall be subject to all laws, regulations, and general and specific plans of the legislative body of any city in which the conservancy proposes to take action.