A borehole in Kenya's Turkana County. Experts say that groundwater in drylands is recharged through extreme floods. Credit: Isaiah Esipisu/IPS

By Isaiah Esipisu
TURKANA COUNTY, Kenya, Aug 8 2019 (IPS)

Extreme rainfall and heavy flooding, often amplified by climate change, causes devastation among communities. But new research published on Aug. 7 in the scientific journal Nature reveals that these dangerous events are extremely significant in recharging groundwater aquifers in drylands across sub-Saharan Africa, making them important for climate change adaptation.

According to the research, which was led by the University College London (UCL) and Cardiff University, this vital source of water for drinking and irrigation across sub-Saharan Africa is resilient to climate variability and change.

“Our study reveals, for the first time, how climate plays a dominant role in controlling the process by which groundwater is restocked,” Richard Taylor, a Professor of Hydrogeology from UCL, told IPS. Taylor is the co-lead on the new study, which was conducted with a consortium of 32 scientists from different universities and institutions from Africa and beyond.

Researchers reviewed data sets of water levels from 14 wells across the region that are not generally used by people.

“Our data-driven results imply greater resilience to climate change than previously supposed in many locations from a groundwater perspective and thus question, for example, the model-driven [Intergovernmental Panel on Climate Change] IPCC consensus that ‘Climate change is projected to reduce renewable surface water and groundwater resources significantly in most dry subtropical regions,’” Taylor said in a statement.

The IPCC Fifth Assessment Report states in contrast that “climate change over the twenty-first century is projected to reduce renewable surface water and groundwater resources significantly in most dry subtropical regions, intensifying competition for water among sectors”.

Groundwater plays a central role in sustaining water supplies and livelihoods in sub-Saharan Africa due to its widespread availability, generally high quality, and intrinsic ability to buffer episodes of drought and increasing climate variability.

So the finding comes as good news for communities and governments across Africa where livelihoods are becoming more and more dependent on groundwater.
“In our current budget, we have allocated over Sh164 million (1.64 million dollars) to irrigation projects, and most of the water already being used is from boreholes,” Chris Aleta, Kenya’s Turkana County Minister for Water and Irrigation, told IPS.

Turkana is a pastoral county and one of the driest in Kenya. Research has revealed that between 1977 and 2016, cattle, which is the main source of livelihood in this county, reduced by 60 percent.

Currently thousands of households are producing horticultural crops that are sold locally in major towns and even overseas.

“Some of us do not have a single cow to graze,” Paul Samal, a pastoralist-turned-farmer from Kaptir Ward, Turkana County, told IPS.

“I had over 200 goats and a herd of 50 cattle, but most of them were consumed by the drought in 2011, and the remaining stock was stolen in 2015,” said the father of five.
So in 2016 he began using groundwater to grow tomatoes, watermelons and indigenous vegetables.

Kenya’s capital, Nairobi, depends heavily on groundwater to supplement the main source from the country’s Dakaini dam, whose recharge mainly depends on unreliable rainy seasons.

Kenya’s neighbour Tanzania will also benefit from the findings.The country’s capital city Dodoma relies solely in groundwater from the Makutapora well field.

According to Lister Kongola, a retired hydrologist who worked for the government of Tanzania from 1977 to 2012, the demand for water in Dodoma City has been rising over the years, from 20 million litres per day (l/day) in the 1970s, to 30 million l/day in the 1980s and to the current 61 million l/day.

The World Bank estimates that at least 70 percent of over 250 million people living in southern African countries rely on groundwater as their primary source of water for drinking, sanitation and livelihood support through agriculture, ecosystem health, and industrial growth.

According to scientists, understanding the nexus of climate extremes and groundwater replenishment is vital for sustainability. This improved understanding is also critical for producing reliable climate change impact projections and adaptation strategies.

The new study also found that unlike drylands, where leakage from seasonal streams, rivers and ponds replenish groundwater, in humid areas groundwater is replenished primarily by rainfall directly infiltrating the land surface.

“This finding is important because model-based assessments of groundwater resources currently ignore the contribution of leaking streams and ponds to groundwater supplies, underestimating its renewability in drylands and resilience to climate change,” said Dr Mark Cuthbert, a research scientist from Cardiff University.

According to Michael Arunga of World Vision, an international humanitarian agency that sometimes supports communities during extreme climate events, the findings are vital for spatial planning for governments in Africa.

“The good thing is that extreme droughts and rainfall seasons are predictable, and the patterns are the same across Africa,” Arunga told IPS.
“These findings will therefore make it easier for governments to draft policies for sustainable groundwater use based on knowledge.”

Since extreme floods can easily be predicted up to nine months in advance, the researchers say that there is a possibility of designing schemes to enhance groundwater recharge by capturing a portion of flood discharges via a process known as Managed Aquifer Recharge.

According to Prof Daniel Olago, a senior lecturer at the Department of Geology, University of Nairobi, groundwater in Africa remains a hidden resource that has not been studied exhaustively.

“When people want to access groundwater, they ask experts to go out there and do a hydro-geophysical survey basically to site a borehole without necessarily understanding the characteristics of that particular aquifer,” he told IPS.

However, in the recent past, the United Kingdom research councils (Natural Environment Research Council, Economic and Social Research Council and the Engineering and Physical Sciences Research Council), the Department for International Development (DFID) and The Royal Society have been supporting studies that seek to understand the potential of groundwater resources in Africa, and how it can be used to alleviate poverty.

“Moving into the 21st century with climate change, with growing population, with rapid growing urban centres, groundwater is going to be very important,” said Olago.

Richard Taylor, a Professor of Hydrogeology from the University College London (UCL) (far left) is the principal investigator in a project to study groundwater resources to understand more how to use the resource to alleviate poverty. Credit: Isaiah Esipisu/IPS

By Isaiah Esipisu
DODOMA, Tanzania, Jul 11 2019 (IPS)

Research scientists are studying groundwater resources in three African countries in order to understand the renewability of the source and how people can use it sustainably towards a green revolution in Africa.

“We don’t want to repeat some of the mistakes during the green revolution that has taken place in Asia, where people opted to use groundwater, then groundwater was overused and we ended up with a problem of sustainability,” said Richard Taylor, the principal investigator and a professor of Hydrogeology from the University College London (UCL).

Through a project known as Groundwater Futures in Sub-Saharan Africa (GroFutures), a team of 40 scientists from Africa and abroad have teamed up to develop a scientific basis and participatory management processes by which groundwater resources can be used sustainably for poverty alleviation.

Though the study is still ongoing, scientists can now tell how and when different major aquifers recharge, how they respond to different climatic shocks and extremes, and they are already looking for appropriate ways of boosting groundwater recharge for more sustainability.

“Our focus is on Tanzania, Ethiopia and Niger,” said Taylor. “These are three strategic laboratories in tropical Africa where we are expecting rapid development of agriculture and the increased need to irrigate,” he told IPS.

In Tanzania, scientists from UCL in collaboration with their colleagues from the local Sokoine University of Agriculture, the Ministry of Water and Irrigation and the WamiRuvu Basin Water Board, have been studying the Makutapora well field, which is the only source of water for the country’s capital city – Dodoma.

“This is demand-driven research because we have previously had conflicting data about the actual yield of this well field,” said Catherine Kongola, a government official who heads and manages a sub section of the WamiRuvu Basin in Central Tanzania. The WamiRuvu Basin comprises the country’s two major rivers of Wami and Ruvi and covers almost 70,000 square kilometres.

She notes that scientists are using modern techniques to study the behaviour of groundwater in relation to climate shocks and also human impact, as well as the quality of the water in different locations of the basin.

“Groundwater has always been regarded as a hidden resource. But using science, we can now understand how it behaves, and this will help with the formulation of appropriate policies for sustainability in the future,” she told IPS.

Already, the World Bank in collaboration with the Africa Development Bank intends to invest some nine billion dollars in irrigation on the African continent. This was announced during last year’s Africa Green Revolution Forum that was held in Kigali, Rwanda.

According to Rajiv Shah, the president of the Rockefeller Foundation, boosting irrigation is key to improving agricultural productivity in Africa.

“In each of the areas where we are working, people are already looking at groundwater as a key way of improving household income and livelihoods, but also improving food security, so that people are less dependent on imported food,” said Taylor. “But the big question is; where does the water come from?”

Since the 1960s, during the green revolution in Asia, India relied heavily on groundwater for irrigation, particularly on rice and wheat, in order to feed the growing population. But today, depletion of the groundwater in the country has become a national crisis, and it is primarily attributed to heavy abstraction for irrigation.

The depletion crisis remains a major challenge in many other places on the globe, including the United States and China where intensive agriculture is practiced.

“It is based on such experiences that we are working towards reducing uncertainty in the renewability and quantity of accessible groundwater to meet future demands for food, water and environmental services, while at the same time promoting inclusion of poor people’s voices in decision-making processes on groundwater development pathways,” said Taylor.

After a few years of intensive research in Tanzania’s Makutapora well field, scientists have discovered that the well field—which is found in an area mainly characterised by seasonal rivers, vegetation such as acacia shrubs, cactus trees, baobab and others that thrive in dry areas—can only be recharged during extreme floods that can also destroy agricultural crops and even property.

“By the end of the year 2015, we installed river stage gauges to record the amount of water in the streams. Through this, we can monitor an hourly resolution of the river flow and how the water flow is linked to groundwater recharge,” Dr David Seddon, a research scientist whose PhD thesis was based on the Makutapora well field, told IPS.

Taylor explains that Makutapora is known for having the longest-known groundwater level record in sub-Saharan Africa.

“A study of the well field over the past 60 years reveals that recharge sustaining the daily pumping of water for use in the city occurs episodically and depends on heavy seasonal rainfall associated with El Niño Southern Oscillation,” Taylor said.

According to Lister Kongola, a retired hydrologist who worked for the government from 1977 to 2012, the demand for water in the nearby capital city of Dodoma has been rising over the years, from 20 million litres in the 1970s, to 30 million litres in the 1980s and to the current 61 million litres.

“With most government offices now relocating from Dar Es Salaam to Dodoma, the establishment of the University of Dodoma, other institutions of higher learning and health institutions, and the emergence of several hotels in the city, the demand is likely going to double in the coming few years,” Kongola told IPS.

The good news, however, is that seasons with El Niño kind of rainfall are predictable. “By anticipating these events, we can seek to amplify them through minimal but strategic engineering interventions that might allow us to actually increase replenishment of the well-field,” said Taylor.

According to Professor Nuhu Hatibu, the East African head of the Alliance for a Green Revolution in Africa, irrigation has been the ‘magic’ bullet for improving agricultural productivity all over the world, and “that is exactly what Africa needs to achieve a green revolution.”

Tank trucks being filled with water in front of Osman Bin Affan Mosque in Beirut. Credit: Oriol Andrés Gallart/IPS

By Oriol Andrés Gallart
BEIRUT, Jul 28 2014 (IPS)

In front of Osman Bin Affan Mosque, in a central but narrow street of Beirut, several tank trucks are being filled with large amounts of water. The mosque has its own well, which allows it to pump water directly from the aquifers that cross the Lebanese underground. Once filled, the trucks will start going through the city to supply hundreds of homes and shops.

In a normal year, the water trucks do not appear until September, but this year they have started working even before summer because of the severe drought currently affecting Lebanon.

This comes on top of the increased pressure on the existing water supply due to the presence of more than one million Syrian refugees fleeing the war, exacerbating a situation which may lead to food insecurity and public health problems.“The more we deplete our groundwater reserves, the less we can rely on them in the coming season. If next year we have below average rainfalls, the water conditions will be much worse than today” – Nadim Farajalla of the Issam Fares Institute (IFI)

Rains were scarce last winter. While the annual average in recent decades was above 800 mm, this year it was around 400 mm, making it one of the worst rainfall seasons in the last sixty years.

The paradox is that Lebanon should not suffer from water scarcity. Annual precipitation is about 8,600 million cubic metres while normal water demand ranges between 1,473 and 1,530 million cubic metres per year, according to the Impact of Population Growth and Climate Change on Water Scarcity, Agricultural Output and Food Security report published  in April by the Issam Fares Institute (IFI) at the American University of Beirut.

However, as Nadim Farajalla, Research Director of IFI’s Climate Change and Environment in the Arab World Programme, explains, the country’s inability to store water efficiently, water pollution and its misuse both in agriculture and for domestic purposes, have put great pressure on the resource.

According to Bruno Minjauw, Food and Agriculture Organization (FAO) representative ad interim in the country as well as Resilience Officer, Lebanon “has always been a very wet country. Therefore, the production system has never looked so much at the problem of water.”

Referring to the figures for rainfall, Minjauw says that “what we are seeing is definitely an issue of climate change. Over the years, drought or seasons of scarcity have become more frequent”. In his opinion, the current drought must be taken as a warning: “It is time to manage water in a better way.”

However, he continues, “the good news is that this country is not exploiting its full potential in terms of sustainable water consumption, so there’s plenty of room for improvement.”

Meanwhile, water has become an issue, with scarcity hitting particularly hard the agricultural sector, which accounts for 60 percent of the water consumed despite the sector’s limited impact on the Lebanese economy (agriculture contributed to 5.9% of the country’s gross domestic product in 2011).

“Some municipalities are limiting what farmers can plant,” explains Gabriel Bayram, an agricultural advisor with KDS, a local development consultancy.

Minjauw believes that there is a real danger “in terms of food insecurity because we have more people [like refugees] coming while production is diminishing.” Nevertheless, he points out that the current crisis has increased the interest of government and farmers in “increase the quantity of land using improved irrigation systems, such as the drip irrigation system, which consume much less water.” Drip irrigation saves water – and fertiliser – by allowing water to drip slowly through a network of  tubes that deliver water directly to the base of the plant.

FAO is also working to promote the newest technologies in agriculture within the framework of a 4-year plan to improve food security and stabilise rural livelihoods in Lebanon.

Sheik Osama Chehab, in charge of the Osman Bin Affan Mosque, explains that, 20 years ago, water could be found three metres under the ground surface. “Yesterday,” he told IPS, “we dug 120 metres and did not find a drop.”

Digging wells has long been the main alternative to insufficient public water supplies in Lebanon and, according to the National Water Sector Strategy, there are about 42,000 wells throughout the country, half of which are unlicensed.

However, notes Farajalla “this has led to a drop in the water table and along the coast most [aquifers] are experiencing sea water intrusion, thus contaminating these aquifers for generations to come. The more we deplete our groundwater reserves, the less we can rely on them in the coming season. If next year we have below average rainfalls, the water conditions will be much worse than today.”

Besides, he cautions, “most of these wells have not passed quality tests. Therefore there are also risks that water use could trigger diseases among the population.”

The drought is also exacerbating tensions between host communities and Syrian refugees.

The rural municipality of Barouk, for example, whose springs and river supply water to big areas in Lebanon, today can count on only 30 percent of the usual quantity of water available. However, consumption needs have risen by around 25 percent as a result of the presence of 2,000 refugees and Barouk’s deputy mayor Dr. Marwan Mahmoud explains that this has generated complaints against newcomers.

However, Minjauw believes that “within that worrisome context, there is the possibility to mitigate the conflict and turn it into a win-win situation, employing both host and refugee communities in building long-term solutions for water management and conservation as well as forest maintenance and management. This would be beneficial for Lebanese farmers in the long term while enhancing the livelihoods of suffering people.”

For Farajalla, part of the problem related to water is that “there is a general lack of awareness and knowledge among decision-makers” in Lebanon, and he argues that it is up to civil society to lead the process, pressuring the government for “more transparency and better governance and accountability” in water management.

He claims that “the government failed with this drought by not looking at it earlier.” So far, a cabinet in continuous political crisis has promoted few and ineffective measures to alleviate the drought. One of the most recent ideas was to import water from Turkey, with prohibitive costs.

“Soon, you will also hear about projects to desalinate sea water,” says Farajalla. “Both ideas are silly because in Lebanon we can improve a lot of things before resorting to these drastic measures.”