‘Under the Water Industry Act 1991 sewerage undertakers were impliedly empowered to discharge surface water and other non-pollutant water into private watercourses to which they were already discharging at the time the Act came into force, but had no right to create new outfalls into such watercourses without the agreement of their owners.’
WLR Daily, 2nd July 2014
Source: www.iclr.co.uk