AN EXTRA 100,000 megalitres of water was allocated to southern Murray Darling Basin irrigators this week following late-November rainfall.

About 68,000 megalitres was granted to Victoria's Goulburn and Murray irrigators, with NSW Murrumbidgee and Lower Darling irrigators gaining another 32,000 megalitres of general security water.

With northern Victorian allocations remaining below 30 per cent, the move means irrigators will gain a 50 per cent government rebate on their water bills, which is worth about $58 million.

In October, Premier John Brumby announced the Victorian Government would not pay the rebate if water allocations reached 30 per cent by December 1.

On Monday allocations came in at 24 per cent on the Murray and 2 per cent on the Goulburn, ensuring irrigators gained the rebate but leaving them facing yet another disastrous season.

Goulburn Murray Water managing director David Stewart said recent rain had only delivered small gains.

"The limited response to recent rainfall means we are still facing the prospect of the Murray and Goulburn systems having allocations below 30 per cent by the middle of February.

The situation remains grim for the Broken, Campaspe, Loddon and Bullarook systems, which are unlikely to get any allocation.

Victorian Water Minister Tim Holding said the latest round of rebates follows water rate relief of $55 million in 2007-08 and more than $40 million in 2006-07.

"Unfortunately, many Victorian irrigators are experiencing yet another year of disappointing water allocations," he said.

"While financial assistance will not make it rain, it will go some way towards helping cash-strapped farmers."

The dire situation has prompted Victorian Farmers Federation water council chairman Richard Anderson to call for more daily reports on system inflows.

"People need access to these inflows in terms of their impact on trade and allocations," Mr Anderson said.

"It's a matter of being transparent, especially right now."

GMW spokeswoman Lindy Nieuwenhuizen said staff were working to have daily details on inflows and deliveries on their website by early next year.

The Murray Darling Basin Commission already provides such website information.