HBRIC chairman Andy Pearce said the company expected a decision from DoC ahead of the November deadline HBRIC was working towards for finalising funding, farmer sign-up and construction contracting details for the $275 million Ruataniwha project.
At that point it plans to go back to the regional council for final approval to go ahead with a planned $80 million ratepayer investment in the project.
Dr Pearce said HBRIC was "reasonably sure" the end result of DoC's decision-making process would be "a positive outcome" for the project. But he said there was no certainty if the issue became the subject of a subsequent legal challenge, such as a judicial review of DoC's decision.
"We've got no reason to think there's any basis for a judicial review but that is not to say that parties might not attempt to have one just to throw another delay into the process. That would be an interesting test of people's morals and ethics," he said.
Chris Perley, a spokesman for lobby group Transparent Hawke's Bay, which has opposed the dam, said from a project management perspective, HBRIC should have sorted the land-swap issue out "way back".
"Suddenly it's become an 'oh, no' thing. It's not exactly a sign of confidence," Mr Perley said.
Dr Pearce said the possibility of seeking a judicial review over the land-swap was the only option left to opponents of the project who had fought it unsuccessfully through a board of inquiry process.
"They are left with frustration, delay and scaremongering as their only tactics and we're seeing those tactics being played out."