21Raising and levying of drainage charges on an acreage basis.
(1)Drainage charges under Part I of the [1961 c. 48.] Land Drainage Act 1961 (hereafter in the charges provisions referred to as " the principal Act ") shall, instead of being raised at an amount per pound on the annual value of chargeable hereditaments in river authority areas and levied on the occupiers or owners of the hereditaments, be raised at an amount per acre of chargeable land in those areas and levied on the occupiers or owners of the land in accordance with the charges provisions and the provisions of the said Part I as modified by this Act.
(2)In sections 22 to 29 of this Act and this section " the charges provisions " means those sections and this section.