61 projects, up to $10 billion, 23 published business cases
The National Water Grid Investment Framework requires a detailed business case before a construction proposal. Dungowan Dam had $595 million committed over seven years and was cancelled because the business case did not support construction. The framework was never the problem.
Steps this would change
Rationale
Start with what is right, because this entry is otherwise unfair.
The National Water Grid Investment Framework is staged the way this database argues planning should be staged: a feasibility or research study, then a preliminary business case, then a detailed business case, then construction — each one required to support the next, with up to 50 per cent Commonwealth funding at every stage. A detailed business case is required to support a construction proposal. That is a real gate, in a real framework, doing the right thing in the right order.
Now the portfolio. 61 large water projects. A total capital cost estimate of up to $10 billion. 23 of them with a publicly available business case.
And the commitments that ran ahead of the evidence:
| Project | Commitment | Outcome |
|---|---|---|
| Dungowan Dam | $595.0m over 7 years from 2026-27 | Not proceeding — the business case did not provide sufficient support for construction |
| Emu Swamp Dam and Pipeline | $162.5m | Cancelled |
A funding line sat in the forward estimates for a project whose business case subsequently failed to support it. Nothing in the framework caused that. An announcement did, and the framework then did its job, late and expensively.
The pattern in the sector's numbers is consistent with it. Research on Australian water projects has found total project costs underestimated by at least 116 per cent and benefits inflated by 56 per cent. Estimates prepared to justify a decision already announced are a well-understood failure mode, and this is what it looks like in a portfolio.
And there is precedent for the fix inside the same Commonwealth. Transport proposals seeking more than $250 million go to Infrastructure Australia for evaluation before commitment. Water projects are committed and then evaluated. Two capital programs, same government, opposite sequencing — recorded in the process map at the commitment step.
What should change, and none of it requires legislation:
- Publish the detailed business case at the moment a construction commitment is announced, or publish the reason it is being withheld. Not after construction, not on request — at the announcement.
- State the funding stage every listed project has actually reached. A portfolio in which feasibility studies, business cases and funded construction all appear as "projects" invites a reader to count $10 billion of dams that do not exist.
- Publish realised cost against original estimate for completed projects. The 116 per cent finding comes from academic research. The administering body holds the data.
Who acts: the Commonwealth, on its own portfolio, without amending anything.
What is being traded away
Business cases contain commercially sensitive material and publishing them has real costs. Land acquisition footprints, cost estimates and contingency allowances are exactly what a landholder or a contractor would want to know before negotiating. That is a genuine reason to withhold parts, and it is why recommendation 1 asks for publication or a stated reason, rather than publication regardless.
Publishing at commitment could produce worse business cases, not better ones. A document written to be published is written differently — more defensively, with less frank treatment of downside cases. The candid internal assessment that says "this only works if the yield assumption holds" is the part most likely to disappear. This site has raised the same objection about published condition data in social housing and reached the same uncomfortable answer: publish anyway.
The 116 per cent and 56 per cent figures are from research, not from an audit of this fund. They characterise Australian water infrastructure estimation broadly and should not be attributed to the National Water Grid Fund's own portfolio without a specific audit — which is what recommendation 3 would enable and which does not currently exist. The ANAO examined the design and governance of the predecessor fund and found record-keeping about program need and funding envelope could have been better; that is a related finding, not the same one.
And cancelling Dungowan was the system working. A government that withdraws $595 million because the business case did not support construction has made the right decision. Recording it as a failure of sequencing is fair; recording it as a failure of judgement would not be, and the entry should not be read that way.
Precedent
Infrastructure Australia evaluates transport proposals seeking more than $250 million before the Commonwealth commits, and publishes its evaluations. The same Commonwealth, the same kind of decision, a different discipline.
Sources
- National Water Grid Investment Framework: staged funding for feasibility/research studies, preliminary business case, detailed business case and construction; a detailed business case is required to support construction proposals; up to 50 per cent of total capital costs for delivery
- The National Water Grid Fund portfolio of 61 large water projects has a total capital cost estimate of up to $10 billion, with only 23 having publicly available business cases
- The Australian Government is not proceeding with $595.0 million over 7 years from 2026-27 for the Dungowan Dam project, as the business case did not provide sufficient support for construction of the project
- The Australian Government's $162.5 million commitment to the Emu Swamp Dam and Pipeline has been cancelled
- Research finding total project costs underestimated by at least 116 per cent and benefits inflated by 56 per cent
- ANAO performance audit, Design and Governance of the National Water Infrastructure Development Fund: agencies could have better documented the basis on which key program design elements were determined, including program need and funding envelope size
- Infrastructure Australia evaluates proposals seeking more than $250 million in Commonwealth investment before commitment