Fish and Game has slammed the proposed Ruataniwha dam, labelling it "a highly risky strategy based on imprecise science".
The claim was made yesterday on the second to last day of a board of inquiry hearing into the Ruataniwha water storage scheme.
A five-member board is tasked with deciding the fate of the project which is being promoted by the Hawke's Bay Regional Council.
The dam, which would supply water for an irrigation scheme across the drought-prone Ruataniwha Plains in Central Hawke's Bay, is being promoted by the council as a means of boosting agricultural and horticultural productivity in the region.
Sue Simons, lawyer for the Hawke's Bay and Eastern Fish and Game Councils, said in her closing submission at the hearing that consents for the scheme should be declined because the project was based on imprecise science and flawed modelling.