Why transfer resources between regions?
A resource is surplus where there is more than people use, and deficit where there is less than they need. Nature spreads water, gas, coal and sun unevenly, but people and factories gather where trade and jobs are. This mismatch is the reason for cross-regional resource transfer: moving resources from the surplus region to the deficit region.
Common reasons: dry cities and farms, fast-growing industry, clean fuel needs, and the wish to share the benefits of a rich resource region with the rest of the country.
Water transfer projects
Water is moved by canals, tunnels, pipelines and pumps, usually from a basin with surplus to a basin with shortage (inter-basin transfer).
- South-North Water Transfer (China): moves Yangtze water north to dry cities such as Beijing and Tianjin.
- Indira Gandhi Canal and Narmada canal (India): bring river water to the dry west.
- California Aqueduct (USA): carries water from the wetter north to dry southern cities.
Issues: huge cost, pumping energy, evaporation and leakage, people displaced, effects on the river that gives the water, and disputes between regions.
Natural gas transfer
Natural gas travels in strong buried steel pipelines at high pressure. Compressor or pump stations along the way push it forward. Gas is used as clean-burning fuel for homes and industry, to make fertiliser and to generate power.
- West-East Gas Pipeline (China): carries gas from western gas fields to the east coast cities.
- HBJ pipeline (India): carries gas from the west coast to fertiliser and power plants in the north.
Benefit: clean fuel in the place of coal. Issues: very high cost, leak and fire risk, need for a steady buyer, and an unequal share of benefits.
Electricity (power) transfer
Electricity is sent through high-voltage transmission lines on tall towers. Raising the voltage cuts the current and so the heat loss in the wires, so far-away transfer is practical. Several lines joined together make a grid that balances supply and demand across regions.
- UHV lines (China): carry hydropower and coal power from the west to the east.
- National grid (India): lets surplus power in one region meet demand in another.
Benefit: use the best sources (hydro, wind, solar) and avoid blackouts. Issues: line loss, land for towers, high cost, and the need to keep the grid stable.
Benefits and costs: is a transfer worth it?
| Benefits | Costs and problems |
|---|---|
| Supply for the short region, growth of farms and industry | Very high money cost |
| Income for the source region | Land and homes lost, people moved |
| Cleaner fuel and balanced supply | Harm to rivers, forests and wildlife |
| Fewer shortages and blackouts | Loss on the way; disputes between regions |
A good plan compares the cost with other options such as saving water, rain harvesting, local solar power or recycling, and shares benefits fairly with the source region.
Try it
In the 3D free-play step, change the resource and the distance, and watch how much arrives and what it costs. The model uses simple example numbers, not real data. At home: list one thing you use that comes from far away (water, cooking gas, electricity). Where might it come from?
Key formulas and definitions
- Surplus region - Deficit region = need for transfer
- Delivered amount = sent amount - loss on the way
- Worth it when benefit > cost (money, land, nature)
- Higher voltage means lower current and lower line loss (P_loss = I^2 R)
Worked examples
1. A canal sends 500 units of water. 15% is lost to leaks and evaporation. How much arrives?
Loss = 15% of 500 = 75. Arrives = 500 - 75 = 425 units.
2. Region A has 120 units of gas and needs 70. Region B has 20 and needs 60. How much can A send to B?
A has a surplus of 120 - 70 = 50. B has a deficit of 60 - 20 = 40. A can cover the whole deficit and send 40 units, keeping 10 spare.
3. Why are power lines for long-distance transfer built at very high voltage?
For the same power, a higher voltage needs a smaller current. Heat loss in the wire depends on current squared, so a smaller current wastes much less energy.
4. Give two benefits and two problems of a long water transfer project.
Benefits: water for dry cities and farms, growth of industry. Problems: very high cost and pumping energy, people and land lost, harm to the source river, disputes.
Common mistakes
- Thinking transfer creates new resources. It only moves existing ones.
- Forgetting loss on the way (leaks, evaporation, line loss).
- Thinking the source region has nothing to lose. It may lose water, land or future options.
- Thinking transfer is always the best answer. Saving water or local energy can be cheaper.