RGA president Robert Massina said the RGA has reviewed the recent Murray and Murrumbidgee rainfall events and system inflows, and based on its analysis expects there have been "sufficient inflows to justify a small allocation increase for both our New South Wales Murray and Murrumbidgee general security irrigators".
"The RGA reinforces however that our estimates, as summarised below, should not be relied upon.
"These figures are simply our best attempt to predict the likely allocation announcements using publicly available information.
"Unfortunately though the RGA, like many others, often find the water allocation determinations surprising and difficult to interpret.
"Nonetheless, in the instance that our estimates are incorrect, we challenge the DPI Water to work with us, our growers and other stakeholders to develop an allocations system that is more transparent, more predictable and timelier in accounting for water availability.
"While we acknowledge the government’s position that it is difficult to account for recent improvements in resource in a timely fashion, we argue that this excuse does not fly when we can see overall storage levels improving on a daily basis, and when any water allocation is of such critical importance to our growers.
"While the anticipated improvements are only small, every drop counts for our New South Wales Murray and Murrumbidgee irrigators, who have faced little to no allocation for almost two years now."
Analysis summaries from the RGA are provided below.
NSW Murray Valley
Since the last comprehensive NSW Murray allocation statement on April 15, the Murray’s four key storage have seen significant inflows of approximately 460 gigalitres.
Governments would reasonably expect further improvements to storages in the coming weeks, considering the continuation of significant flows in the Murray system and inflows into the Menindee Lakes.
These river flows will also offset the need to allocate water to cover river operations and losses, further improving the water available for allocation.
Taking into account the water sharing arrangements between the three states, we believe the total resource improvement in NSW’s account would be at the very least 150 gigalitres.
Noting that the April 15 water allocation statement required 115 gigalitres to be set aside to meet 2020-21 high priority needs before a general security allocation would be made, we expect that at the very least 35 gigalitres will be allocated to general security accounts in this last announcement for the 2019-20. This is equivalent to a two per cent general security allocation.
Murrumbidgee Valley
Similarly, in the Murrumbidgee System, since April 15, more than 100 gigalitres has flowed into the Burrinjuck and Blowering storages, as well as inflows from tributaries below the key storages that will offset the need for operational water.
Noting that the April 15 water allocation statement provides that the 2020-21 high priority commitments have already been secured in the Murrumbidgee, we would expect this resource improvement to result in an allocation improvement for Murrumbidgee general security holders of at least five per cent, taking their total water allocation to 11 per cent.
