"A more detailed assessment will be possible once hearing schedules have been determined by the High Court," the report says.
Meanwhile, HBRIC has used its monthly update report to the council to answer questions councillors raised about the company's application for resource consent to take 15 million cubic metres of groundwater a year from the Tukituki catchment.
Regional councillors have complained that they only heard of the consent application, lodged with their own council, more than a month after it was submitted in May, and from sources outside the council.
HBRIC has been able to apply to take the groundwater as a result of the board of inquiry ruling that the volume of groundwater permitted to be drawn from the Ruataniwha aquifer could be increased from 28.5 million cubic metres a year to 43.5 million cubic metres a year.
HBRIC said the proposal intended "to distribute the benefits of secure water to as many parties as possible, which is entirely consistent with council's own water strategy".
"The groundwater may be utilised for irrigation in peripheral areas, improving reliability and/or further optimising the distribution network," the company said.
"This application and the logic for it, was tested with representatives of the Ruataniwha Water User Group and it was, in turn, traversed by that group themselves."