diffuse sources
as defined in Regulation (EC) No 166/2006 of the European Parliament and of the Council of…, Article 2, point (12) (Definitions)
(12)
‘diffuse sources’ means the many smaller or scattered sources from which pollutants may be released to land, air or water, whose combined impact on those media may be significant and for which it is impractical to collect reports from each individual source;