Victoria rations an A$77 price gap by random draw and 152 applications failed.

The constraint is physical and it is old. The Murray–Darling Basin Authority describes The Narrows as the section of the River Murray through the Barmah–Millewa Forest, and states plainly that it limits flow to “around 7,000 megalitres per day (ML/day)”, the lowest flow in any stretch of the river. Because of that, trade from above The Narrows to below it is restricted by default and allowed only when matching “back trade” capacity exists in the opposite direction. The only instrument the Authority cites is the Murray–Darling Basin Agreement (Schedule D — Permissible Transfers between Trading Zones) Protocol 2010. A balance is credited on 1 July, falls with every allocation trade from above to below, and rises with trade and tagged deliveries the other way.

That channel is what the price step is. In the week of 26 October to 1 November 2026, allocation in Zone 6, Murray above the Barmah Choke, traded at a volume-weighted average of A$222 a megalitre across ten trades. In Zone 7, Murray below the Barmah Choke, it traded at A$299 across thirty-five. Greater Goulburn, Zone 1A, sat at A$268. The same commodity, the same week, A$77 a megalitre apart — and the only lawful way to move a megalitre from the cheap side to the dear side is to be one of the names drawn out of the hat.

The hat is real. The Victorian Water Register opened the Barmah Narrows register on Thursday 2 July 2026 for seven hours, from 7am to 2pm, and processed it the following day “in a randomised order” set by DEECA and WaterNSW. Twenty-four thousand one hundred and twenty-one point three megalitres of opportunity drew 214 eligible applications for 67,445.2 ML — 2.80 times oversubscribed. Sixty-two succeeded for 24,102.4 ML; 152 failed for 43,342.8 ML. On the very same morning, in the very same window, a second register for Goulburn-to-Murray trade offered 112,827.9 ML and cleared 282 of 286 applications. Two registers, one queue each, and only one of them is a lottery.

So price the ticket. At the published weekly averages a successful crossing is worth A$77 a megalitre, and 62 of 214 applications succeeded — 28.9720%. Expected value is A$22.3084 for every megalitre you apply for, against an application fee of A$55.30 through Goulburn-Murray Water’s My Water channel. The break-even application is 2.4789 megalitres. Anything above two and a half megalitres is a positive-expectation lottery ticket sold by a state government, and on 3 July 2026 it handed out A$1,855,884.80 of price gap in a randomised order on one Friday morning.

Here is the part that is not a trading idea. At this week’s rate US$500 is A$727.70, and after the A$55.30 fee that buys 3.0288 megalitres of Zone 6 water. Enter all three of the year’s scheduled openings and the expected gap is A$202.71 a year — 0.2321% of the target. Own-account is dead at this capital and no structure revives it. What is alive is being paid to enter for other people, and that is a service Australia has just regulated in unprecedented detail and still does not license. The Water Markets Intermediaries Code, in Part 5 of the Water Regulations 2008, has been in full operation since 1 October 2025; the ACCC’s market manipulation and insider trading powers commenced 1 July 2026. The Code covers six named services, including “preparing the documents required to trade or transfer water rights on behalf of current or potential clients”, and it bites on anyone who supplies them “in return for a fee or commission”. It requires no licence, no registration, no qualification and no fee.

And now the honest discount, which is the whole edition. The Choke is a very small pond. Reaching US$5,000 a month after Australian income tax needs a pre-tax profit of A$114,476.47. At the 2% midpoint of the commission range the ACCC recorded, that is 19,152.47 megalitres a year brokered — 79.46% of everything that crossed the Choke in the July opening. At 1% it is 38,304.94 megalitres, or 158.93% of it: more water than the entire annual crossing exists to carry. Only at 3% does the target fall inside one opening, at 12,768.31 megalitres, and that is still 52.98% of the national total. The lottery is the hook. The business is the whole southern basin, and what it needs is not A$727.70 but a list of irrigators who will let you lodge for them.