Solutions for Water Shortages

water

“Water, water, every where, Nor any drop to drink.”

– Samuel Taylor Coleridge – The Rime of the Ancient Mariner.

The water companies are the least loved out of the privatised utilities, and the lack of rain over the past two winters is making their job much more difficult. For many people, it is hard to understand that you can have the wettest April for years, and yet we still face the prospect of drought as serious as a country like Australia or Spain (which have much lower rainfall)

It seems crazy that a county with rainfall like the UK should still face the potential for a serious drought. Even when it doesn’t rain much in the UK, there is still more rainfall than other semi-arid countries in the Mediterranean. What is the economics of the UK water situation?

  • Every day half a billion (17,395 million) litres of water goes into the UK mains water supply
  • average consumption in the UK is 150 litres – one of the highest in the EU

Where Does Our Water Come From?

When we think of water supplies, we tend to think of reservoirs like Thirlmere in the Lake District. But, actually, 70% of drinking water in England comes from underground boreholes. These underground water supplies can be very deep. After recent dry winters, water is taken from up to 40 metres down. This is why the recent April showers haven’t really altered these underlying water reserves. The April rain will not have been able to seep down 40 metres yet. The current rain is good for topping up reservoirs and rivers, but to top up underground reservoirs, we need persistent rain in winter. Winter rain is not taken up by plants or evaporates, it just seeps down. That is why water companies, complain about ‘the wrong kind of rain’

Policies to Deal With Water Shortages

To deal with water shortages, there are two main approaches:

  1. Increasing Supply of Water
  2. Managing Demand

Increasing Supply of Water

1. Build More Reservoirs. Building reservoirs will increase the potential supply of water. They are easier to refill than underground boreholes. However, building more reservoirs:

  • Is quite expensive. To rely on reservoirs for our water supplies will increase the cost of water.
  • Typically it takes 25 years from the concept of a new reservoir to bringing it into use.
  • Land availability is quite limited in the south east to build reservoirs.
  • It is not always possible. In many areas of the south of England, the soil is very chalky. Reservoirs are not practical because the chalky soil is not good at holding water. Therefore, reservoirs are not an option in some parts of the country. The problem some regions face is that the only real supply of water is these underground boreholes.

2.  Water Grid. In the north-west, rainfall is much higher than the south. Transferring water, e.g. through the canal system will help overcome shortages in the south. Already, water is moved, for example Manchester is supplied by reservoirs in the Lake District. However, water grids are not without difficulties

  • It is not so easy to move water around. It is heavy and expensive to move.
  • You could still have a drought in the north

3. De-salination plants. For countries in the middle east, desalination plants are key to providing water. In theory, they offer unlimited supplies from the sea. London already has its first desalination plant in the Thames estuary.  However, it is expensive to remove the salt. To rely on de-salination plants for water supply would be very expensive. Also, they require substantial power and produce carbon emissions, which isn’t good for the environment.

Managing Demand

1. Water Pricing. If water becomes scarce the economic solution is to increase the price. Let market forces set the price. At the moment, many households pay a flat rate – there is no incentive to reduce water consumption because if you leave the tap running, there is no extra cost. We would never consider paying for electricity like that, where there is just a flat rate to get connected.  If people paid for water consumption, there would be an incentive to recycle water, reduce consumption and buy water-saving appliances. In drought conditions, water companies could also increase the price to further increase the incentive.

People may say it is unfair to people on low incomes. But, it would also be a way for people to reduce their water bills through careful water management. Why should thrifty water users pay for others extravagance? Also, extra units of water become increasingly expensive. The marginal cost of water rises, the more we consume. The first units are cheap to extract from rivers, but those extra units require expensive reservoirs and desalination plants. Therefore, reducing excess water consumption will save considerably.

2. Reduce industry demand. The biggest consumption of water is not actually by households, but by industry. For example, our power stations are hungry consumers of water. Changing energy sources to renewable energy, would help both reduce carbon emissions, but also reduce long-term water consumption.

3. Advertising campaigns to reduce water. Water companies often appeal to our good nature in asking us to reduce water consumption. But, these will only be a very partial solution.

4. Restricting supplies. Hosepipe bans and standpipes reduce consumption of water.

Conclusion

If we continue to have changing weather patterns, something is going to have to change dramatically. It will require a range of solutions. The first obvious step is to introduce water pricing – making households and industry pay for each unit consumed. Also, the price of water is likely to go up. This extra revenue will be needed to be invested in dealing with long-term supply projects from a water grid to desalination plants. However, as well as tackling household consumption a change in industry use and energy strategy should be considered.

What do you think? Should we pay more for water?

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