These initial recommendations followed engineers' reports in 2005 that the hydrology of the ponds was poorly understood. These same engineering reports resulted in engineering works in 2006 on the two ponds in the grounds of Kenwood House, to make their overflow structures and dams safer. There was strong opposition from the swimming clubs and the Protect Our Ponds campaign. In 2013 a united campaign was launched called Dam Nonsense to oppose the works, which the campaign claimed unnecessary and in conflict with the Hampstead Heath Act 1871. The campaign included all the groups opposed to the proposals. The work on the Hampstead Heath dams was further complicated by the regulations embodied in the 1975 Reservoir Act, which only relate to three dams on the Heath, and the regulations under the Flood and Water Management Act 2010 which potentially relate to all 14 dams on the Heath. The Heath and Hampstead Society took the engineering decisions of the City of London to judicial review in November 2014: the interpretation of the 1975 Reservoir Act was challenged and thereby the nature of the proposed engineering works to the dams. The case was heard by The Honourable Mrs Justice Lang (DBE) and a ruling, in favour of the City of London, was issued on 28 November 2014 (case number CO/4175/2014). The judgement also addressed the status of the proposed engineering works relative to the provisions of the 1871 Act, again ruling that the engineers had shown due consideration for the provisions of the Act.