Decade of drought: a global tour of seven recent water crises

Projections for water stress in 2020, 2030 and 2040 indicate that the global picture is likely going to get worse.

Every inhabited continent, to varying degrees, has areas where there is extremely high water stress. These are areas where more than 80% of the local water supply is withdrawn by businesses, farmers, residents and other consumers every year.

These so-called stressed areas are also the ones most vulnerable to episodic droughts. With chronic overuse of water resources, it only takes a string of years with bad rainfall or poor management decisions to plunge a region into crisis and chaos. Here’s a look at seven extreme droughts that have occurred in the past decade.

 

Map of water stress around the world

Australia’s one-in-a-thousand-year drought

Australia’s “millennium” drought began in 1995 and continued country-wide until late 2009. Reservoir levels fell precipitously, as did crop production and industrial water use. A number of cities, including Melbourne, Sydney and Perth, built desalination plants in an effort to partially drought-proof themselves, while other areas pursued grey-water recycling projects. Between 2001 and 2012 the federal government provided $4.5 billion in assistance to drought-affected farmers and small businesses.

In 2010 and 2011, following quickly on the heels of the drought, Australia experienced its worst flooding in half a century, as an area of Queensland larger than the size of France and Germany flooded, affecting 200,000 people and costing at least $10 billion in damage.

Spain imports water by ship

Drought in Spain’s north-eastern region of Catalonia grew so severe in 2008 that Barcelona began importing water by ship from France. About 70% of Spain’s water goes to agriculture, and much of it is wasted through a combination of inefficient irrigation systems and water-thirsty crops unsuitable for the arid climate. Other critics say low water prices are the culprits as they result in profligate water use and low investment in water-efficient infrastructure.

Northern India’s groundwater loss can be seen from space

Water stress in India map

Twin satellites from Nasa’s Gravity Recovery and Climate Experiment (Grace) are able to detect changes in the Earth’s gravity field brought about by changes in the way water is distributed, including in groundwater storage. Nowhere on Earth are groundwater declines greater than in northern India; Nasa found that large-scale irrigation caused 108 cubic km of groundwater loss in Haryana, Punjab, Rajasthan and Delhi between 2002 and 2008. The study’s lead, Matt Rodell, observed that“the region has become dependent on irrigation to maximise agricultural productivity. If measures are not taken to ensure sustainable groundwater usage, the consequences for the 114 million residents of the region may include a collapse of agricultural output and severe shortages of potable water”.

In July 2012, roughly half of India’s population – about 670 million people or 10% of the world’s population – temporarily lost power following a massive grid failure. Some experts laid the blame on the severe drought affecting northern India. Low rainfall restricted the amount of power delivered by hydroelectric dams, and farmers used more power than usual to run water pumps to irrigate their crops.

The dark side of China’s boom

Much of northern China is relatively dry – not unlike California and the rest of the western United States – yet it has also traditionally produced significant amounts of wheat and other grains thanks to flood irrigation. Add skyrocketing water use by industry, energy and municipalities to this inefficient system and hydrologists warn that China’s future is in danger of drying up.

Government officials are starting to take action. Water is now one of China’s public policy priorities, and the central government recently launched a “three red lines” policy to improve efficient water use and to place caps on water demand. Yet it remains unclear whether these policies are sufficient to overcome the country’s vast water challenges.

Mesopotamian nightmare

From 2006 through 2011, Syria suffered its worst drought and crop failure in recorded history. The Grace satellite data revealed “an alarming rate of decrease in total water storage in the Tigris and Euphrates river basins, which [at the time] had the second fastest rate of groundwater storage loss on Earth, after India”. While many other factors – political, social and religious – have contributed to the Syrian military conflict, experts argue that “the decrease in water availability, water mismanagement, agricultural failures, and related economic deterioration contributed to population dislocations and the migration of rural communities to nearby cities. These factors further contributed to urban unemployment, economic dislocations, food insecurity for more than a million people, and subsequent social unrest”.

South-eastern Brazil on the brink

In Brazil “water refugees” are fleeing cities such as São Paulo and there is talk of bringing in the military if the drought grows worse.

Parts of south-eastern Brazil, including the cities of São Paulo, Rio de Janeiro and Belo Horizonte, are struggling through the worst drought in 84 years, with 40 million people and the nation’s economic powerhouse at risk. Reservoirssupplying water to these cities are at dangerously low levels. They’re also highly polluted.

Unfortunately, politicians have failed to act decisively to take steps to minimise the impact of the crisis, raising levels of public distrust and frustration. There has even been talk of “water refugees” leaving the cities, and bringing in the military to help out if matters grow worse.

Turning now to California

California is in the throes of an unprecedented drought, now in its fourth year. Governor Jerry Brown ordered mandatory restrictions on water use by state municipalities early last month, and a group of farmers have since given up a quarter of their water rights this year in exchange for being spared deeper mandatory cuts. The situation is bad, even desperate for some farmers. As I argued in a recent blog, the state needs to improve its water governance in order to protect its economic interests and its citizens.

The situation is poised to worsen

Forthcoming projections for global water stress in 2020, 2030 and 2040 by WRI’s Aqueduct project indicate that the global water picture is likely going to get worse over the next few decades. Larger populations and growing economies demand more water and in some places climate change will likely reduce available water supply. While our vulnerability to drought grows, the incidence of extreme weather events, including drought, will grow as well, according to most climate change experts.

In this knowledge lies power. We know that drought risk is high and growing worldwide. We’re already seeing the impact that water scarcity has on citizens, on the environment and on economies. Sustainable water management plans, clear government monitoring and management policies and wise natural and engineered infrastructure investments could have helped to shore up the dwindling water supply, alleviating impacts on people, planet and economy.

It’s time to put this information into action. Businesses, governments and all water managers must quickly and intelligently take measures to reduce vulnerability to droughts.

A version of this post first appeared on the WRI Insights blog. View the original here

Source: www.theguardian.com