The conservancy authority may confer total or partial exemptions from, or allow rebates to or make compositions with any person with respect to charges, and may vary or extinguish any such exemption, rebate or composition.

Nothing in section 30 (duty to make available for inspection etc. certain charges) of the 1964 Act requires the conservancy authority to include in the list of ship, passenger and goods dues kept at the harbour office, as required by subsection (1) of that section, charges reduced by a rebate allowed on, or subject to a compounding arrangement in respect of, a due included in that list.