BRADFIELD IRRIGATION SCHEME (Australia becomes the Fruit Bowl for south east Asia )
- Graham Healy
- 2 hours ago
- 4 min read
BRADFIELD IRRIGATION SCHEME
(Australia becomes the Fruit Bowl for south east Asia )
Building Australia's economy for Future Generations
supplying local Jobs and building local industry for a massive export market.
Graham Healy
wed 29/7/26
**The Bradfield Scheme** (proposed by engineer Dr John Bradfield in 1938, with a 1942 variation) is a long-discussed inter-basin water diversion concept. It aimed to capture excess monsoon runoff from the east-flowing Tully, Herbert and Burdekin Rivers in far north Queensland and move it west across the Great Dividing Range to irrigate arid/semi-arid inland areas (primarily western Queensland, with some variants reaching toward Lake Eyre or the northern Murray–Darling Basin).
Modern CSIRO assessments (for the National Water Grid Authority) and a Queensland government panel have examined the original proposal and contemporary variants. They found the concepts technically feasible in principle but not economically viable at scale: water yields are substantially lower than Bradfield estimated, infrastructure costs are very high ($10–32+ billion depending on variant and assumptions), and farm revenues would cover only a fraction of costs even under highly optimistic scenarios. Using water closer to where it falls is generally assessed as lower-cost and lower-risk.
### Key Features of the Proposed Scheme
| Aspect | Original / Historic Proposal (Bradfield 1938/1942) | Contemporary Variants (CSIRO-assessed) |
|--------|-----------------------------------------------------|---------------------------------------|
| **Source rivers** | Upper Tully, Herbert & Burdekin (monsoon-fed, east-flowing to Coral Sea) | Same catchments; prioritises downstream environmental & existing user needs |
| **Key infrastructure** | Hell’s Gates Dam on Burdekin (originally ~122 m high; 1942 variant higher); tunnels, pipelines or channels across Great Dividing Range | ~98 m Hell’s Gates Dam + pumped pipelines / gravity tunnels / long channels (hundreds of km); some solar-assisted pumping considered |
| **Destination** | Flinders then Thomson River systems (western Qld), ultimately toward Kati Thanda–Lake Eyre | Thomson River area **or** northern Murray–Darling Basin (e.g. St George / Condamine–Balonne) |
| **Claimed / assessed water volume** | Bradfield estimated ~5,360 GL/year into Thomson catchment (after losses, ~⅔ available for use); overall streamflow estimates higher than modern data support | Modified 1942-style: ~1,880 GL to Thomson farms (75% of years, after losses). To northern MDB: ~1,270 GL on-farm (equivalent to ~25% of recent average MDB irrigation use) |
| **Claimed irrigated area** | >3,000 sq miles (~7,800 km² / ~780,000 ha); “over 4,000 sq miles of the richest agricultural land” | Thomson: sufficient for ~190,000 ha dry-season cotton. Northern MDB: reliability boost for existing ~90,000 ha + ~80,000 ha new cotton (75% reliability) + ~30,000 ha high-value horticulture (e.g. citrus, 100% reliability) under optimistic assumptions |
| **Other claimed features** | Hydro-electric potential ~370 MW (with scope to double); climate moderation via more vegetation / fuller Lake Eyre | Limited hydro potential along the long transfer route; climate-modification claims not supported by modern modelling |
### Claimed Agricultural & Economic Benefits (Proponent View)
| Benefit Category | Description (as promoted historically and by modern advocates) | Scale / Notes from Assessments |
|------------------|----------------------------------------------------------------|-------------------------------|
| **New irrigated agriculture** | Transform arid inland plains into productive farmland for cotton, broadacre crops, horticulture (citrus, etc.), and improved livestock carrying capacity | Optimistic modern scenarios: tens to low hundreds of thousands of hectares of new or more reliable irrigation; high-value horticulture yields highest revenue per megalitre |
| **Drought resilience & regional development** | Secure water supply for western Queensland / northern MDB; support population growth and economic activity in sparsely settled inland areas | Regional economic benefit upper-bound estimates under extreme optimism: up to ~$5–6 billion/year and 11,000–14,000 jobs (many seasonal/contract; benefits partly accrue outside the region). Realistic cases far lower |
| **Food production & exports** | Increase Australia’s output of exportable crops, helping position the country as a reliable “food bowl” supplier | Additional cotton and horticulture could contribute to exports; Australia is already a major global food exporter. Proximity of northern production to Asian markets is often cited in broader northern Australia development discussions |
| **Hydro power & other** | Generate electricity for towns, pumping and irrigation | Limited practical hydro potential on the long inland transfer route once water is timed for agriculture |
### Turning Australia into a “Food Bowl” for Southeast Asia — Claimed Advantages
Proponents of large-scale northern and inland irrigation (including Bradfield-style ideas) have long argued that Australia’s vast land, relatively clean production systems, and proximity to growing Asian markets create an opportunity to expand high-reliability food exports. Southeast Asia’s population and demand for protein, grains, fruits, vegetables and other products continue to rise.
**Claimed benefits in this framing include:**
- Greater reliability of supply for export crops (cotton, citrus and other horticulture, potential broadacre grains or specialised products) compared with rain-fed or variable systems.
- Economic multiplier effects from new farms, processing (e.g. cotton gins), transport and regional towns.
- Strategic contribution to regional food security while generating Australian export income and jobs.
- Complementary role alongside existing Australian production (Murray–Darling is already described as Australia’s “food basket”) and other northern Australia water developments closer to the coast or using local rivers/aquifers.
**Important caveats from independent assessments:**
The long-distance diversion infrastructure of Bradfield-style schemes adds a large cost premium that crop revenues have not been shown to cover. Soil suitability, high inland evaporation/irrigation requirements, transport distances back to ports, market absorption rates for large new horticultural volumes, environmental trade-offs (source rivers, Great Barrier Reef sediment loads in some scenarios, inland ecosystems), cultural heritage, and social impacts are all significant factors. CSIRO and the Queensland Bradfield panel concluded that the original scheme and large-scale long-distance variants are not economically viable and recommended against proceeding; smaller, strategically located developments closer to where the water falls are generally preferred.
In short, the Bradfield Scheme remains an ambitious historical vision for irrigating inland Australia and boosting agricultural output. Modern technical and economic analysis indicates the costs and risks of the classic long-distance version outweigh the benefits relative to alternative water and agricultural development pathways. Broader efforts to expand northern Australian agriculture for Asian markets continue to be examined through other, more localised projects and planning processes.
