directly or in combination with other matter which he or another person causes or permits to enter those waters) to impede the proper flow of the waters in a manner leading, or likely to lead, to a substantial aggravation of --  (a) pollution due to other causes; or (b) the consequences of such pollution. (6) Subject to the following provisions of this Part, a person who contravenes this section shall be guilty of an offence and liable --  (a) on summary conviction, to imprisonment for a term not exceeding three months or to a fine not exceeding 20,000 or to both; (b) on conviction on indictment, to imprisonment for a term not exceeding two years or to a fine or to both. ] Annotations: Annotations are used to give authority for changes and other effects on the legislation you are viewing and to convey editorial information. They appear at the foot of the relevant provision or under the associated heading. Annotations are categorised by annotation type, such as F-notes for textual amendments and I-notes for commencement information (a full list can be found in the Editorial Practice Guide). Each annotation is identified by a sequential reference number. For F-notes, M-notes and X-notes, the number also appears in bold superscript at the relevant location in the text. All annotations contain links to the affecting legislation. (1) For the purposes of section 30F above a discharge of any effluent or other matter is, in relation to any person, in contravention of a