Water Resources Act 1991

4 (1) The Authority may by byelaws make such provision as the Authority considers appropriate—

(a) for prohibiting or regulating the washing or cleaning in any controlled waters of things of a description specified in the byelaws;

(b) for prohibiting or regulating the keeping or use on any controlled waters of vessels of a description specified in the byelaws which are provided with water closets or other sanitary appliances.

(2) In this paragraph—

• “controlled waters” has the same meaning as in Part III of this Act; and

• “sanitary appliance”, in relation to a vessel, means any appliance which—

  (a)

  not being a sink, bath or shower bath, is designed to permit polluting matter to pass into the water where the vessel is situated; and

  (b)

  is prescribed for the purposes of this paragraph.