His presentation will be followed by a panel discussion featuring Wellington economist Peter Fraser and Fish & Game environmental manager Corina Jordan, who was instrumental in the organisation's challenge to the scheme through the High Court and a board of inquiry process.
The pair have been invited to participate by lobby group Transparent Hawke's Bay, which has opposed plans by the council to invest up to $80 million of ratepayer money in the scheme.
A third Transparent Hawke's Bay panelist will be farm adviser Barrie Ridler.
Mr Newman said HBRIC directors, staff and senior consultants used by the company would be at the meeting to answer questions and contribute to the panel discussion.
The Ruataniwha scheme will be discussed at a regional council meeting tomorrow where councillors will be asked to accept an HBRIC recommendation that it has achieved one of the conditions necessary for the project to proceed - the granting of satisfactory resource consent conditions through the board of inquiry process.
A final decision on whether the project goes ahead is expected to be made by the council in November.
Transparent Hawke's Bay spokesman and Green Party activist Chris Perley said next week's public meeting was important because a number of issues remained unclear in regards to the scheme, including the date for making a final decision.
"It's ratepayers' money and we think it should be very clear what sort of off-ramps there are - a decision point which says it's not going to go ahead," he said.
-Next Thursday's meeting is at Tamatea Intermediate School, starting at 6.30pm. Questions will not be taken from the floor on the night but readers are invited to email questions to editor@hbtoday.co.nz. People attending will be asked to make a gold-coin donation which will go to the Limitless Hope Emergency Shelter Appeal.