But the Heath & Hampstead Society is questioning the scheme's legal premise. It has employed a top QC, specialising in environmental law, to produce an independent view of the "complex legal issues" involved in the dams project.
Society chairman Tony Hillier said: "We've always been in debate about the legal advice given to the City. If it turns out that we are correct in believing that the City has not been well advised, then obviously we will tell them where they need to think again. Then it's up to them." He added: "Our hoped-for outcome is that there will be no visible changes to the look and environment of the Heath.That's what we're here to do, preserve its wild and natural status."
In 1975 water cascaded to parts of Gospel Oak and Dartmouth Park, causing more than £1million worth of damage. But the society claims this was due to a faulty sewage system rather than a failure of the dams system. The ponds have only overflowed once in recent years.
The society is questioning whether an act to preserve the appearance of the open space, known as the Hampstead Heath Act 1871, should trump the Reservoirs Act 1975, which requires the City to safeguard against flooding. If this proves to be the case the society will argue that this should be taken into account when final plans for the scheme are drawn up. The first sketches are expected to be unveiled in May or June 2013.
Mr Hillier said: "The difficulty is that the Reservoirs Act states that it's really up to the engineers to decide what, if anything, needs to be done to strengthen reservoirs 'in the interests of safety'.
"There are three issue: Firstly what does 'in the interests of safety' mean?
"Secondly, who decides – should it be an engineer unguided by wider statutory and legal consultation?
"Thirdly, what are the approved methods and methodologies that should guide the research and analysis for whoever makes the final decision? What is the approved modelling and measuring technique in order to assess the risk?"
The project stalled briefly last week as the City struggled to find a national contractor to take on the project. But Heath bosseshave resolved to approach smaller firms to carry out the work.
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