In arid places like Tilcara, in the Quebrada de Humahuaca, Jujuy, groundwater resserves play a crucial role. Credit: Juan Moseinco/IPS

By Marcela Valente
BUENOS AIRES, Oct 10 2013 (IPS)

Half of Argentina is supplied with water by invisible underground aquifers, which are crucial in the country’s arid and semi-arid regions, experts say. But Tierramérica discovered that nobody – not even the government – has any accurate scientific data on these groundwater reserves.

Beyond the Guaraní Aquifer, the vast underground body of fresh water shared by Argentina, Brazil, Paraguay and Uruguay, little is known about the groundwater reserves of this country with a wealth of highly visible water resources, including the rivers of the Rio de la Plata Basin, Iguazú Falls, and the majestic glaciers of Patagonia.

The Guaraní Aquifer became well known due to a monitoring plan funded by the Global Environment Facility (GEF), “but in Argentina there are other aquifers that are exploited much more intensively” and support regional economies, said Ofelia Tujchneider, a geologist from the National University of the Littoral.

In terms of the quantity and quality of its water, the most important is the Puelches aquifer, which lies beneath part of the province of Buenos Aires, in eastern Argentina, Córdoba in the centre of the country, and Santa Fe in the northeast.

According to the Environmental Atlas of Buenos Aires, the depth of the Puelches aquifer ranges from 40 to 120 metres, and it supplies 9,900 cubic metres of water a day. It is located between the Pampeano aquifer, which is closer to the surface, and the deeper Paraná aquifer, whose water is salty and used primarily by industry.

In the eastern region of the country are the Ituzaingó, Salto and Salto Chico aquifers. And in the province of Neuquén, in the western part of the southern region of Patagonia, groundwater reserves provide water for the oil, gas and mining industries, explained Mario Hernández, a hydrogeologist from the National University of La Plata.

There are also aquifers in the southern province of Santa Cruz. And in the northwest, an arid region with little rainfall, these groundwater deposits are recharged by river water.

In the western provinces of Mendoza and San Juan, water is supplied primarily by underground reserves. As a result, the aquifers here are studied and protected, and subject to regular monitoring, because the local wine industry depends on the water they provide.

“Groundwater resources play a key role in arid and semi-arid regions. If it weren’t for the aquifers, massive engineering works would be needed to supply water for irrigation or residential use,” Tujchneider told Tierramérica.

Groundwater is abundant, of good quality, tends to be better protected from pollution, and can be found in large volumes even beneath arid, desertified or desert areas.

The Rio de la Plata Basin encompasses 85 percent of the country’s surface water resources, according to the book “Agua: Panorama general en Argentina” (Water: A general overview in Argentina), published by the non-governmental organisation Green Cross. But this network of rivers only extends to 33 percent of the country, in the northeast, and flows into the large estuary that gives the basin its name and empties into the Atlantic Ocean.

Much of the rest of the country is arid or semi-arid, with areas where the available water supply is less than 1,000 cubic metres per person per year, the measure used to define water scarcity by the United Nations Development Programme.

In 2010, 82.6 percent of the population, currently estimated at 41 million, was served by the drinking water supply system.

According to Hernández, half of the country is supplied with water by aquifers, which provide water for the irrigation of cereal and grain crops as well as the industrial and mining sectors and a large share of household consumption.

However, he stressed to Tierramérica, there are no accurate measurements or statistics on Argentina’s groundwater reserves.

The only available data is from a 2000 World Bank report, which estimated that groundwater resources account for 35 percent of the water used for irrigation, livestock farming, industry and household consumption.

Tujchneider believes that the current level of groundwater use is “quite a lot higher than 35 percent,” particularly because of an increase in irrigation and in rice production in recent years.

However, because of the lack of recognition of the immense value of this resource, there is a danger that groundwater reserves can become contaminated with agrochemicals, industrial waste or wastewater, or that they will be exploited beyond their recharge capacity.

The water stored in an aquifer may have been there for a very long time. If it is extracted without limits, it could run out, as is already happening in Mendoza, warned Tujchneider.

Hernández noted that aquifers are “more protected from contamination than surface water” but they are also “more fragile, and once they are contaminated, they are much more difficult to clean up than rivers.”

“There is a lack of knowledge. They are not valued, and they don’t teach about them in schools. Children think that water comes from a tap,” he commented.

The Federal National Groundwater Plan aims to put an end to this lack of visibility, said its coordinator, Jorge Santa Cruz, who has a PhD in natural sciences and headed up the studies on the Guaraní Aquifer. The first step will be the organisation of diagnostic workshops in the country’s different provinces, he told Tierramérica.

The objectives of the plan, which is being overseen by the Undersecretariat of Water Resources, include the development of a database of hydrogeological data so that aquifers are viewed as reserves of a resource that is “known, predictable and reliable,” even if it cannot be seen.

* This story was originally published by Latin American newspapers that are part of the Tierramérica network.

Pristimantis orcesi, a species of frog found only in the páramos of Ecuador. Credit: Courtesy of the Private Technical University of Loja

By Leisa Sánchez
QUITO, Jun 4 2013 (IPS)

The “páramos” or high plateaus of Ecuador, a crucial source of water, are showing signs of extreme fragility and a troubling loss of capacity to conserve this vital resource and sustain the survival of numerous species found nowhere else on earth.

The páramo is a high mountain ecosystem situated between 3,200 and 4,200 metres above sea level, and one of the most vulnerable in Ecuador. The threats that it faces are the result of climate change, deforestation and changes in land use.

The jambato toad (Atelopus ignescens) has already disappeared from the páramos, and there are fears for the survival of various species of mammals.

These high plains grasslands function like a sponge, absorbing and storing large volumes of freshwater which are then released continuously and gradually, feeding river systems and preventing abrupt variations in their flow.

But the páramo ecosystem has a limited capacity for recovering its original structure and biodiversity once these are altered, warned the founder of the non-profit scientific organisation EcoCiencia, Patricio Mena.

“It is intrinsically very fragile, which means that any disturbance, and even rains and winds, cause significant effects in the short, medium and long term. This is why it must be treated with great care,” Mena told Tierramérica.

The páramos are disappearing and vital water resources are being absorbed by the highly permeable volcanic soils beneath them: this was the warning sounded at the 7th Ibero-American Seminar on Science Journalism, held May 16-17 in the southern Ecuadorian city of Loja.

One particularly delicate issue is that of oil exploration and drilling in the páramos, observed Spanish seminar participant Seber Urgarte, a professor from the communications department at Abat Oliba CEU University and currently a guest researcher at the Private Technical University of Loja (UTPL).

This is why it is crucial to “preserve these ecosystems in light of their water and energy resources and biodiversity, above and beyond economic and political interests,” he told Tierramérica.

Mena stressed that the páramos supply water to indigenous communities and large cities alike. “Quito depends almost 100 percent on the water produced and stored in the surrounding páramos,” he said.

A study conducted as part of the Andean Páramo Project (PPA) found that these high plateau ecosystems are found in 18 of Ecuador’s 24 provinces. The most important are those of Napo, in north-central Ecuador, and Azuay and Morona-Santiago, in the south.

The PPA, which concluded in 2012, was a joint initiative of the Global Environment Facility (GEF) and the United Nations Environment Programme. It was implemented in Ecuador, Venezuela, Colombia and Peru, with project activities emphasising research and local community participation. EcoCiencia was the Ecuadorian counterpart.

The study, “Distribución espacial, sistemas ecológicos y caracterización florística de los páramos en el Ecuador” (Spatial distribution, ecological systems and plant species of the páramos of Ecuador), found that these ecosystems cover 1.33 million hectares in the country, roughly five percent of its total area.

Close to 40 percent of Ecuador’s páramos are protected. The largest protected area is in Sangay National Park, which straddles the provinces of Morona-Santiago, Tungurahua, Chimborazo and Cañar, and accounts for 261,062 hectares. Of the remaining 60 percent, 30 percent have been altered by human intervention, and 30 percent are degraded, the study says.

But Mena, who formed part of the PPA team, stressed that “it is difficult to specify a percentage” or calculate an exact number of hectares that are degraded. Instead, it should be recognised that “all of the páramo is affected, because climate change affects the entire ecosystem.”

In general terms, the páramos of the eastern mountain range, which are moister and whose original biodiversity has remained intact, have a greater capacity to respond to environmental alterations, while the western páramos have suffered more serious impacts.

This is why Mena prefers to speak in terms of “a mosaic that ranges from perfectly well-preserved páramos to ecosystems in a state of profound degeneration that has practically transformed them into highly fragile deserts, like the dry páramos of (the central province of) Chimborazo.”

The páramos of Ecuador are characterised by a high degree of endemic flora and fauna. They are home to five species of reptiles, 24 of amphibians, and 88 of birds, of which 24 are found nowhere else.

According to the National Statistics and Census Institute, there are 565,858 hectares of arable land in Ecuador’s páramos, representing 4.85 percent of the country’s 11.6 million hectares of farmland.

In the meantime, “the area of land in the páramos under concession for mining activities decreased ostensibly, from 40.46 percent in 2008 to 12.53 percent in 2009,” engineer Fausto López from the department of natural sciences at UTPL told Tierramérica.

Mining concessions are concentrated in the south, in the provinces of Azuay, Loja and Zamora Chinchipe.

López believes that “the environmental cost is high, due to the threat to the habitat of numerous species of flora and fauna.” The most vulnerable are the mountain tapir, spectacled bear and culpeo or Andean fox, as well as the various species of amphibians.

“Given that these species need large areas for their survival, the establishment of corridors or networks of protected areas is one of the best strategies for their conservation,” he added.

But biologist Carlos Iván Espinosa explained that “one of the problems in the tropics is the lack of historical information on species and even on climate behaviour.”

“There are many species that have still not been described and that could be disappearing due to the effects of climate change,” argued Espinosa, also a researcher at UTPL.

The biggest challenge, stressed Mena, is to raise awareness of the fact that “the páramos are a part of our daily lives in an indirect by fundamental way: through the supply of water.”

* This story was originally published by Latin American newspapers that are part of the Tierramérica network.

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