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Drilling Industry News

Study: Ground Water Pumping Leads to Sea Level Rise

May 14, 2012

As people pump ground water for irrigation, drinking water and industrial uses, the water doesn't just seep back into the ground – it also evaporates into the atmosphere, or runs off into rivers and canals, eventually emptying into the world's oceans. This water adds up, and a new study calculates that by 2050, ground water pumping will cause a global sea level rise of about 0.8 millimeters per year.

"Other than ice on land, the excessive ground water extractions are fast becoming the most important terrestrial water contribution to sea level rise," says Yoshihide Wada, with Utrecht University in the Netherlands and lead author of the study. In the coming decades, he notes, ground water contributions to sea level rise are expected to become as significant as those of melting glaciers and ice caps outside of Greenland and the Antarctic.

Between around 1970 and 1990, sea level rise caused by ground water pumping was cancelled out as people built dams, trapping water in reservoirs so the water wouldn't empty into the sea, Wada explains. His research shows that starting in the 1990s, that changed as populations started pumping more groundwater and building fewer dams.

The researchers looked not only at the contribution of ground water pumping, which they had investigated before, but also at other factors that influence the amount of terrestrial water entering the oceans, including marsh drainage, forest clearing and new reservoirs. Wada and his colleagues calculate that by mid-century, the net effect of these additional factors is an additional 0.05 mm per year of annual sea level rise, on top of the contribution from ground water pumping alone.

The research team's article is published in Geophysical Research Letters, a journal of the American Geophysical Union.

The last report of the United Nations Intergovernmental Panel on Climate Change in 2007 addressed the effect on sea level rise of melting ice on land, including glaciers and ice caps, Wada says. But it didn't quantify the future contribution from other terrestrial water sources, such as ground water, reservoirs, wetlands and more, he reveals, because the report's authors thought the estimates for those sources were too uncertain.

"They assumed that the positive and negative contribution from the ground water and the reservoirs would cancel out," Wada says. "We found that wasn't the case. The contribution from the ground water is going to increase further, and outweigh the negative contribution from reservoirs."

In the current study, the researchers estimated the impact of ground water depletion since 1900 using data from individual countries on ground water pumping, model simulations of ground water recharge, and reconstructions of how water demand has changed over the years. They also compared and corrected those estimates with observations from sources such as the GRACE satellite, which uses gravity measurements to determine variations in ground water storage.

With these ground water depletion rates, Wada and his colleagues estimate that in 2000, people pumped about 204 cubic kilometers (49 cubic miles) of ground water, most of which was used for irrigation. Most of this, in turn, evaporates from plants, enters the atmosphere and rains back down. Taking into account the seepage of ground water back into the aquifers, as well as evaporation and runoff, the researchers estimated that ground water pumping resulted in sea level rise of about 0.57 mm in 2000 – much greater than the 1900 annual sea level rise of 0.035 mm.

The researchers also projected ground water depletion, reservoir storage and other impacts for the rest of the century, using climate models and projected population growth and land-use changes. The increase in ground water depletion between 1900 and 2000 is due mostly to increased water demands, the researchers find. But the increase projected between 2000 and 2050 is mostly due to climate-related factors like decreased surface water availability and irrigated agricultural fields that dry out faster in a warmer climate.

If things continue as projected, Wada estimates that by 2050, the net, cumulative effect of these non-ice, land-based water sources and reservoirs -- including ground water pumping, marsh drainage, dams and more – will have added 31 mm to sea level rise since 1900.

The new study assumes that, where there is ground water, people will find a way to extract it, Wada says, but some of his colleagues are investigating the limits of ground water extraction. One way to decrease ground water's contribution to sea level rise, he notes, is to improve water efficiency in agriculture – to grow more with less ground water.  

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