An apolitical, community advisory group in the Murray-Darling Basin has taken the unprecedented step of writing to politicians asking for its support in a key piece of legislation which will decide the future of the basin plan.

The plan hangs in balance with state governments angry after Federal Labor sided with the Greens and Victorian crossbench senator Derryn Hinch to block parts of it put before the Senate.

With another important vote looming, one group which was formed under the original legislation for the basin plan is coming off the sidelines to beg for support.

The Basin Community Committee is a group of representatives from throughout the Murray-Darling which advises the Murray-Darling Basin Authority on its work with the plan.

They have been meeting since the plan's inception, with representatives from all the region's geographical areas, coming together with diverse opinions upon which they rarely agree.

But with state governments threatening to walk away, basin communities and the Basin Community Committee are angry at not being heard following a number of inquiries into the plan.

In a letter to federal politicians, the group has called for certainty for the process stepped out in the legislation for the Murray-Darling.

"We're really concerned that some politics has gotten into the Basin Plan that is really unnecessary," group chair Rory Treweeke, who comes from Lightning Ridge in New South Wales, said.

The concern from the group comes after a piece of legislation aimed to get the same environmental outcome for the plan, with less water in the northern half of the Murray-Darling — the Northern Basin Review — was blocked a the last minute in Federal Parliament.

Federal Labor sided with the Greens and Victorian crossbench Senator Derryn Hinch on a disallowance motion which rejected the Murray-Darling Basin Authority's work.

That was immediately condemned by the Victorian Labor government and the New South Wales coalition government.

On May 8 it is expected another key vote will come before the Federal Parliament.

This time the vote will be on a similar plan for the southern Murray-Darling.

The 'sustainable diversion limits adjustment', a plan for works to make the river flow better and maximise the use of environmental water, would reduce the amount of water taken for the environment by 605 gigalitres.

What is the Murray-Darling Basin Plan? The Murray-Darling Basin Plan has remained controversial ever since its introduction back in 2012. Read more Read more

This group believes the Murray-Darling Basin Plan is on track, and for it to exist this vote must pass.

"We are concerned that it will destroy too much of what is necessary for the good implementation of the plan," Mr Treweeke said.

The group was so concerned at the state of the Basin Plan that each member of the plan self-funded a trip to meet and draft the letter.

"We met at Sydney airport. It was at our own expense. It was a meeting of the committee that was not funded in anyway by the Murray-Darling Basin Authority," the Basin Community Committee's chair said.

Letters have now been sent to senators prior to the vote next month.

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