From rural businesses, to horticulture, all their members were passionate about their businesses, and the people they employed - whose jobs depended on the business staying afloat.
For Ms Coull personally, "we're service orientated so should there be an impact it would affect us, our business probably wouldn't survive."
The application is currently in the process, with the Special Tribunal holding a pre-hearing conference this Friday.
Although RWNZ recognised it was "sometimes difficult to balance the environmental interests and the interests of recreation users and growers and producers", they said the interest of those who made a living from primary produce needed to be factored in.
Should the tribunal determine the application is appropriate for the lower reaches of the river, RWNZ stated they opposed the range of controls, and prohibitions suggested within the draft order for the stretch below Whanawhana cableway.
"We propose that an alternative range of controls, limits and restrictions be considered that are enabling of food, fibre, and wine production values."
These values were "integral to the cultural identity and economic wellbeing of the local communities and any revised water conservation order should consider the protection of those values because they are outstanding, both nationally and regionally."
Forest and Bird - one of the WCO applicants - declined to comment.