Deputy mayor Annette Brosnan said "a number of options" were considered before deciding on a joint committee, with an equal partnership meaning a commitment to work together to address the estuary environment's stormwater and environmental degradation issues.
"This may be a new approach but it is one that I am confident embodies the principals of partnership, participation and protection in Te Tiriti o Waitangi," she said. "Co-governance with HBRC and Mana Ahuriri Trust is a commitment to working together from the very outset and at all levels."
Mana Ahuriri Trust chairwoman Tania Eden and her board say they are pleased to join the councils in the historic partnership to begin the restoration of Ahuriri Regional Park and Te Muriwai o te Whanga.
Hawke's Bay Regional councillor Hinewai Ormsby said it marks a change in acknowledging a truly collaborative relationship with Napier City Council and the Mana Ahuriri Trust in "striving for improved health and wellbeing of our taonga Te Whanganui ā Orotū".
"This is us putting our hands up to say 'our collective contribution now, will benefit our future generations to come'," she said.