Where at the date on which a drainage rate is made for any internal drainage district or sub-district land situated wholly or partly within the district or sub-district is included in the valuation list as a single hereditament by virtue of section 1(1) of the [1976 c. 15.] Rating (Caravan Sites) Act 1976 (treatment of caravan sites as single hereditaments for general rating purposes), that land or the part so situated may be treated as a single hereditament for the purposes of the drainage rate.

As regards any period for which an area of a caravan site is rated as a single hereditament by virtue of subsection (1) above, the site operator for the time being shall be deemed to be the occupier of that area for the purposes of the provisions of this Part of this Act relating to drainage rates and for the purposes of section 116(2) below and Schedule 2 to this Act.

For the purposes of this section " caravan site " means any land in respect of which a site licence is required under Part I of the [1960 c. 62.] Caravan Sites and Control of Development Act 1960, or would be so required if paragraph 4 and paragraph 11 of Schedule 1 to that Act (exemption of certain land occupied and supervised by organisations concerned with recreational activities and of land occupied by local authorities) were omitted; and " site operator " means the person who is for the purposes of Part I of that Act the occupier of the caravan site.