SOUTHERN Murray Darling Basin irrigators contribution to reviving environmental flows remains unchanged - at almost 2300GL.

Under the guide to the basin plan released last October southern basin communities were to lose 2321 gigalitres.

Yet a MDB Authority spreadsheet on the draft, leaked to the media this week, shows northern basin irrigators contribution to the environment will be cut from 630 gigalitres down to 450 gigalitres.

Until now MDBA modelling under its October guide showed at least 3000GL would need to be diverted from irrigators to the environment to push 2000GL through the Murray mouth.

However, the new spreadsheet shows the draft's proposal cuts the total diversions to the environment from 3000GL to 2800GL, with most of the benefit going to northern irrigators tapping into the Darling River and its tributaries.

Under the new draft, southern irrigators will have to contribute 1318 gigalitres to water wetlands in their own valleys, plus contribute another 972 gigalitres to boost the flows out the Murray Mouth in South Australia - a total of 2290 gigalitres.

MDB Authority boss Craig Knowles released details of the controversial draft plan last week,  in what industry analysts regard as an attempt to test the water on community accceptance of the numbers before releasing the full draft in November.

National Irrigators Council chief executive Danny O'Brien said irrigators wanted to see the full plan, as this draft appeared to be no different to the guide for southern basin communities.

NSW Irrigators Council has sought an end to the infernal leaking and speculation over the Basin Plan by calling on the Murray-Darling Basin Authority to simply release it into the public domain.

NSW Irrigators' Council chief executive Andrew Gregson said businesses and communities had had enough of speculation and leaks.

"We call on the Murray-Darling Basin Authority to publicly state immediately whether the figures now circulating are accurate,'' Mr Gregson said.