Fish cages on the Nile River. Experts are calling for a more holistic approach to aquaculture. Credit: Cam Mcgrath/IPS

By Cam McGrath
CAIRO, Jul 26 2014 (IPS)

Less than four percent of Egypt’s land mass is suitable for agriculture, and most of it confined to the densely populated Nile River Valley and Delta. With the nation’s population of 85 million expected to double by 2050, government officials are grappling with ways of ensuring food security and raising nutritional standards.

“With the drive toward increasing food production and efficiency, Egypt is going to have to become smarter in how it uses water and land for food production,” says aquaculture expert Malcolm Beveridge. “It would make sense to bring aquaculture together with agriculture in order to increase food production per unit of land and water.”“Why are we using water first for agriculture then taking the drainage for aquaculture? Surely it should be the opposite – use water first for aquaculture and after that to irrigate fields” – Sherif Sadek, general manager of the Cairo-based Aquaculture Consultant Office

One possibility under study is to adopt integrated aquaculture, a holistic approach to food production in which the wastes of one commercially cultured species are recycled as food or fertiliser for another. Projects typically co-culture several aquatic species, but the synergistic approach also encourages the broader integration of fish production, livestock rearing and agriculture.

“An integrated approach would seem the logical next step for Egypt’s aquaculture industry in that it can significantly reduce water requirements while increasing fish farmers’ revenues,” Beveridge told IPS.

Egypt’s aquaculture sector has witnessed explosive growth in recent decades. Annual production of farmed fish climbed from 50,000 tonnes in the late 1990s to over one million tonnes last year – exceeding the combined output of all other Middle East and African nations.

But fish farming as it is predominantly practised in Egypt – by simply digging a pit and filling it with water and fish – has a major drawback. A decades-old government decree requires that drinking water and crop irrigation be given first call on Nile water, leaving aquaculture projects to operate in downstream filth, contaminating fish and limiting productivity.

“Over 90 percent of the aquaculture in Egypt is based on agricultural drainage water, with plenty of pesticides, sewage and industrial effluents,” says Sherif Sadek, general manager of the Cairo-based Aquaculture Consultant Office.

“Why are we using water first for agriculture then taking the drainage for aquaculture? Surely it should be the opposite – use water first for aquaculture and after that to irrigate fields.”

Integrated aquaculture reverses the water-use paradigm, with tangible benefits to both fish farms and farmers’ crops. While the practice is still in its infancy in Egypt, several projects have demonstrated its commercial viability.

At the El Keram farm in the desert northwest of Cairo, farmers use pumped water for tilapia culture, recycling the water into ponds where catfish are raised. The drainage from the catfish ponds, rich in organic nutrients, is then used to irrigate and fertilise clover fields. Sheep and goats that graze on these fields generate manure that is used to produce biogas to heat the tanks where fish fry are raised, or to warm the fish ponds in the winter.

“The project has demonstrated how farmers who switched to aquaculture after salinity rendered their fields infertile can increase their productivity and profits using the same volume of water,” says Sadek.

Other integrated projects on reclaimed desert land culture marine aquatic species such as sea bass and sea bream, directing the downstream wastewater to pools of red tilapia, a table fish able to tolerate high salinity. According to Sadek, the brine from these ponds can be used to grow salicornia, a halophyte in demand as a biofuel input, livestock fodder and as a gourmet salad ingredient.

“Salicornia can be irrigated with extremely salty water and produces seeds and oil, as well as fodder for camels and sheep,” says Sadek.

According to development experts, integrated aquaculture delivers greater efficiencies, requiring up to 70 percent less water than comparable non-integrated production systems. It is also a cost-effective method of disposing of wastes and saves resource-poor farmers from having to purchase fertilisers.

Beveridge says small-scale Egyptian aquaculture ventures unable to afford the complex closed-loop system employed at El Keram could still benefit from integrated practices that would allow them to harvest commercial food products year-round.

“Egypt’s aquaculture industry has a problem in that the growing season is relatively short,” he notes. “During the months of December to February temperatures are too low to sustain much (fish) growth. And during that period, farmers who try to overwinter their fish often lose substantial numbers to stress and disease.”

Pilot studies have shown that fish farmers are able to capitalise on the nutrients locked up in the mud at the bottom of their earthen fish ponds.

“The idea is that you drain down your ponds in November, harvest your fish, then plant a crop of wheat in your pond bottom that you would harvest in March before flooding the stubble area with water and reintroducing young fish,” Beveridge explains.

The water table is falling in Egypt's desert oases, raising questions of sustainability. Credit: Cam McGrath/IPS

By Cam McGrath
BAHARIYA OASIS, Egypt, Jul 12 2014 (IPS)

Using a hoe, farmer Atef Sayyid removes an earthen plug in an irrigation stream, allowing water to spill onto the parcel of land where he grows dates, olives and almonds.

Until recently, a natural spring exploited since Roman times supplied the iron-rich water that he uses for irrigation. But when the spring began to dry up in the 1990s, the government built a deep well to supplement its waning flow.

Today, a noisy diesel pump syphons water from over a kilometre below the ground. The steaming-hot water is diverted through a maze of earthen canals to irrigate the orchards and palm groves that lie below the dusty town of Bawiti, 300 kilometres southwest of Cairo.

“The deeper source means the water is hotter,” Sayyid explains. “The hot water damages the roots of the fruit trees. It also evaporates quicker, meaning we have to use more water to irrigate.”

Bahariya, the depression in which Bawiti is situated, is one of five major oases in Egypt’s Western Desert. While Egyptians living in the densely populated Nile River Valley and Delta depend on the Nile for their freshwater needs, communities in this remote and arid region rely entirely on underground sources.“This [water drawn from the Nubian Sandstone Aquifer] is fossil water, which means it was deposited a very long time ago and is not being replenished. So once you pump the water out of the aquifer, it’s gone for good” – resource management specialist Richard Tutwiler

Since ancient times, freshwater has percolated through fissures in the bedrock, making agriculture possible in the otherwise inhospitable desert. Water was once so plentiful in the five oases that they were collectively known as a breadbasket of the Roman Empire on account of their intensive grain cultivation.

Ominously, where groundwater once flowed naturally or was tapped near the surface, farmers must now bore up to a kilometre underground, raising fears for the region’s sustainability.

“Historically, springs and artesian wells supplied all the water in the oases,” says Richard Tutwiler, a resource management specialist at the American University in Cairo. “But water pressure is dropping and increasingly it has to be pumped out, particularly as you go from south to north.”

The water is drawn from the Nubian Sandstone Aquifer, an underground reservoir of fossil water accumulated over tens of thousands of years when the Saharan region was less arid than it is today. The vast aquifer extends beneath much of Egypt, Libya, Sudan and Chad, and is estimated to hold 150,000 cubic kilometres of groundwater.

But it is a finite resource, says Tutwiler.

“This is fossil water, which means it was deposited a very long time ago and is not being replenished,” he told IPS. “So once you pump the water out of the aquifer, it’s gone for good.”

Extraction is intensifying in all of the countries that share the aquifer. In Egypt alone, an estimated 700 million cubic metres of water is pumped from deep wells each year.

The increase in water usage is the result of agricultural expansion and population growth. Nearly 2,000 square kilometres of desert land has been reclaimed by groundwater irrigation in the last 60 years. Farmers employ flood irrigation, a traditional technique in which half the water is lost to evaporation and ground seepage before reaching the crops.

Since the 1980s, government programmes aimed at alleviating population pressure on the Nile Valley have encouraged Egyptian families to relocate to the desert. Existing oasis communities have grown while new ones have sprung up around deep wells.

One of these settlements, Abu Minqar, was founded in 1987 and now boasts over 4,000 residents. The isolated community only exists because of its 15 wells, which draw groundwater from depths of up to 1,200 metres.

“Water management in (places like) Abu Minqar must be sustainable,” says Tutwiler. “Because if the wells dry up, it’s game over.”

The number of wells in the Western Desert has increased immensely since the first appearance of percussion drilling machinery 150 years ago. Records show that in 1960 there were less than 30 deep wells in all the oases – today there are nearly 3,000.

In Dakhla Oasis, 550 kilometres southwest of Cairo, natural springs and 900 wells provide water for the 80,000 inhabitants of the oasis, as well as orchards that produce date palms, citrus fruits and mulberries. This was traditionally one of Egypt’s most fertile oases because of the proximity of the aquifer to the surface – less than 100 metres throughout the depression.

But here, as elsewhere, water sources that flowed freely less than a generation ago now only flow with the aid of mechanical pumps. Groundwater extraction has exceeded 500,000 cubic metres a day and the water table is dropping, in some places by nearly two metres a year.

“There are too many straws in the same glass of water,” remarks hydrologist Maghawry Diab

While Diab estimates the Nubian Sandstone Aquifer may hold enough water to last the next 100 years, Egypt’s desert communities could have a lot less time.

Over-pumping has created localised “dry pockets” in the aquifer, which behaves more like a layered damp sponge than a pool of water. Tightly-spaced deep wells are drawing down the water table, while their overlapping well cones intercept upward flowing groundwater before it can recharge the shallower wells.

“All the wells are tapping the same larger cone of depression,” Diab told IPS. “To gain years, we’ll have to find even deeper groundwater sources or (come to terms with) using saline water.”

In an effort to reduce pressure on groundwater resources, Egypt’s government has set restrictions on the drilling of new wells and reduced the discharge rates of certain high-productive ones.

At government wells, a formalised system of water sharing is in place. But farmers thirsty for more water have drilled their own wells, concealing them from authorities or bribing local officials to turn a blind eye.

“We have tried to control the drilling, but there is a lot of resistance from farmers,” says one former irrigation ministry official. “Every time we capped (an unlicensed) well, two more would appear.”

Houseboats line the Nile bank in Cairo. Some 85 million Egyptians depend on the Nile for water. Credit: Cam McGrath/IPS.

By Cam McGrath
CAIRO, Mar 21 2014 (IPS)

When Egypt’s then-president Mohamed Morsi said in June 2013 that “all options” including military intervention, were on the table if Ethiopia continued to develop dams on the Nile River, many dismissed it as posturing. But experts claim Cairo is deadly serious about defending its historic water allotment, and if Ethiopia proceeds with construction of what is set to become Africa’s largest hydroelectric dam, a military strike is not out of the question.

Relations between Egypt and Ethiopia have soured since Ethiopia began construction on the 4.2 billion dollar Grand Renaissance Dam in 2011.

Egypt fears the new dam, slated to begin operation in 2017, will reduce the downstream flow of the Nile, which 85 million Egyptians rely on for almost all of their water needs. Officials in the Ministry of Irrigation claim Egypt will lose 20 to 30 percent of its share of Nile water and nearly a third of the electricity generated by its Aswan High Dam."Hydroelectric dams don’t work unless you let the water through.” -- Richard Tutwiler, a specialist in water resource management at the American University in Cairo

Ethiopia insists the Grand Renaissance Dam and its 74 billion cubic metre reservoir at the headwaters of the Blue Nile will have no adverse effect on Egypt’s water share. It hopes the 6,000 megawatt hydroelectric project will lead to energy self-sufficiency and catapult the country out of grinding poverty.

“Egypt sees its Nile water share as a matter of national security,” strategic analyst Ahmed Abdel Halim tells IPS. “To Ethiopia, the new dam is a source of national pride, and essential to its economic future.”

The dispute has heated up since Ethiopia began diverting a stretch of the Nile last May, with some Egyptian parliamentarians calling for sending commandos or arming local insurgents to sabotage the dam project unless Ethiopia halts construction.

Ethiopia’s state-run television responded last month with a report on a visit to the site by army commanders, who voiced their readiness to “pay the price” to defend the partially-built hydro project.

Citing a pair of colonial-era treaties, Egypt argues that it is entitled to no less than two-thirds of the Nile’s water and has veto power over any upstream water projects such as dams or irrigation networks.

Accords drawn up by the British in 1929 and amended in 1959 divvied up the Nile’s waters between Egypt and Sudan without ever consulting the upstream states that were the source of those waters.

The 1959 agreement awarded Egypt 55.5 billion cubic metres of the Nile’s 84 billion cubic metre average annual flow, while Sudan received 18.5 billion cubic metres. Another 10 billion cubic metres is lost to evaporation in Lake Nasser, which was created by Egypt’s Aswan High Dam in the 1970s, leaving barely a drop for the nine other states that share the Nile’s waters.

While the treaty’s water allocations appear gravely unfair to upstream Nile states, analysts point out that unlike the mountainous equatorial nations, which have alternative sources of water, the desert countries of Egypt and Sudan rely almost entirely on the Nile for their water needs.

“One reason for the high level of anxiety is that nobody really knows how this dam is going to affect Egypt’s water share,” Richard Tutwiler, a specialist in water resource management at the American University in Cairo (AUC), tells IPS. “Egypt is totally dependent on the Nile. Without it, there is no Egypt.”

Egypt’s concerns appear warranted as its per capita water share is just 660 cubic metres, among the world’s lowest. The country’s population is forecast to double in the next 50 years, putting even further strain on scarce water resources.

But upstream African nations have their own growing populations to feed, and the thought of tapping the Nile for their agriculture or drinking water needs is all too tempting.

The desire for a more equitable distribution of Nile water rights resulted in the 2010 Entebbe Agreement, which replaces water quotas with a clause that permits all activities provided they do not “significantly” impact the water security of other Nile Basin states. Five upstream countries – Ethiopia, Kenya, Uganda, Tanzania and Rwanda – signed the accord. Burundi signed a year later.

Egypt rejected the new treaty outright. But after decades of wielding its political clout to quash the water projects of its impoverished upstream neighbours, Cairo now finds itself in the uncomfortable position of watching its mastery over the Nile’s waters slip through its fingers.

“Ethiopia’s move was unprecedented. Never before has an upstream state unilaterally built a dam without downstream approval,” Ayman Shabaana of the Cairo-based Institute for Africa Studies had told IPS last June. “If other upstream countries follow suit, Egypt will have a serious water emergency on its hands.”

Ethiopia has sought to assure its downstream neighbours that the Grand Renaissance Dam is a hydroelectric project, not an irrigation scheme. But the dam is part of a broader scheme that would see at least three more dams on the Nile.

Cairo has dubbed the proposal “provocative”.

Egypt has appealed to international bodies to force Ethiopia to halt construction of the dam until its downstream impact can be determined. And while officials here hope for a diplomatic solution to diffuse the crisis, security sources say Egypt’s military leadership is prepared to use force to protect its stake in the river.

Former president Hosni Mubarak floated plans for an air strike on any dam that Ethiopia built on the Nile, and in 2010 established an airbase in southeastern Sudan as a staging point for just such an operation, according to leaked emails from the global intelligence company Stratfor posted on Wikileaks.

Egypt’s position was weakened in 2012 when Sudan, its traditional ally on Nile water issues, rescinded its opposition to the Grand Renaissance Dam and instead threw its weight behind the project. Analysts attribute Khartoum’s change of heart to the country’s revised domestic priorities following the secession of South Sudan a year earlier.

According to AUC’s Tutwiler, once Sudan felt assured that the dam would have minimal impact on its water allotment, the mega-project’s other benefits became clear. The dam is expected to improve flood control, expand downstream irrigation capacity and, crucially, allow Ethiopia to export surplus electricity to power-hungry Sudan via a cross-border link.

Some studies indicate that properly managed hydroelectric dams in Ethiopia could mitigate damaging floods and increase Egypt’s overall water share. Storing water in the cooler climes of Ethiopia would ensure far less water is lost to evaporation than in the desert behind the Aswan High Dam.

Egypt, however, is particularly concerned about the loss of water share during the five to ten years it will take to fill the dam’s reservoir. Tutwiler says it is unlikely that Ethiopia will severely choke or stop the flow of water.

“Ethiopia needs the electricity…and hydroelectric dams don’t work unless you let the water through.”

Three boys in the Moqattam area look out over Cairo, the growing population of which is rapidly depleting already scarce water resources. Credit: Shelly Kittleson/IPS.

By Shelly Kittleson
CAIRO, Feb 6 2014 (IPS)

Heavy reliance on water intensive crops, a major upstream dam project for the Nile basin, and rising groundwater levels pushing at pharaoh-era monuments will be pressing issues for the next Egyptian president – whether military or civilian.

As criticism continues over the military’s heavy-handedness to quell protests, little attention is being given to the late January announcement by Egypt’s minister of irrigation and water resources on the growing severity of the country’s water shortage: share of water per citizen stands at 640 cubic metres, compared with an international standard of 1,000.

The minister said he expected this amount to decrease to 370 cubic metres by 2050 due to a rapidly growing population.“Many people need to start measuring how much water they use, but it’s hard to break traditions here.”

A scientist working in the water resources sector expressed cautious hope to IPS that “the military is one of the few institutions that can actually get things done.” But he added: “That said, they were in power for a long time and didn’t do anything.”

Improving irrigation practices and countering the demographic explosion are some of the most commonly cited actions to be considered, as well as reducing the use of pesticides and improving sewage and waste disposal systems to prevent contaminating the limited water supplies available.

Attempting to lessen the population’s consumption of sugar would also be beneficial, experts say, not only in terms of water supplies but also public health.

Hugely popular juice pressed from water-intensive sugarcane can be found on street corners across Egypt, with inhabitants swearing by its “kidney-cleansing” properties. Ubiquitous coffee and tea gets steeped in sugar.

Diabetes levels have risen by 83 percent over the past 15 years, but little attempt is made to inform the public of the health-related risks or stem the preponderance of sugarcane production.

Egypt’s agriculture sector consumes well over 80 percent of the country’s annual water resources and sugarcane accounts for a large portion, alongside rice and cotton.

Rice production has been banned by the government in some areas for its heavy water requirements, though it commands a high price on the international market, is a staple for the population, and a certain quantity helps control soil salinity and limits saltwater intrusion in the Delta.

Egypt is instead the world’s largest importer of wheat and buys over half of its requirements from abroad, much of which goes into subsidised bread for the quarter of its 84 million people who live below the poverty line of 1.65 dollars a day.

A serious issue is that outdated irrigation practices are still in use, Hussein Jeffrey John Gawad, a hydro-geologist working as a consultant in Egypt, told IPS.

“Because there was always an abundance of water before, they just continue flooding the farms,” he said. “Many people need to start measuring how much water they use, but it’s hard to break traditions here.”

In certain areas of the country, it is instead an excess of water that is causing problems. The most traditional face of Egypt to the world – and its main magnet for tourism, a sector that accounted for more than a tenth of Egypt’s GDP prior to the 2011 uprising – may be in danger as well, Gawad noted, due to rising groundwater around the country’s ancient monuments.

As the population swells, agriculture increasingly encroaches on areas near important monuments, bringing with it artificial irrigation channels to which chemical fertilisers are added, thereby increasing salinity levels and seeping into limestone foundations, weakening them.

A rise in the water table around the Osireion – the only remaining visible tomb in Abydos, one of Egypt’s most important archaeological sites – has made it largely inaccessible due to inundation of sand and flooding.

Gawad said that at one point the government had tried to install a “dewatering” system, “but now there is literally zero government attention to this.”

At some sites, pumps and drainage pipes have been set up, with varying levels of success. An international rescue effort led by United Nations Educational, Scientific and Cultural Organisation in the 1960s saved the enormous blocks of the Abu Simbel temples from being submerged by relocating them onto an artificial hill during the construction of the Aswan Dam.

However, the more gradual but relentless weakening of temple foundations and steady erosion of carvings and ancient paintings has not drawn similar attention.

Meanwhile, Ethiopia’s diversion of the Blue Nile as part of its massive Renaissance Dam project looms large over any discussion of Egypt’s future water supplies.

As part of colonial-era agreements, Egypt long held rights to the vast majority of the Nile’s waters. In mid-2010, however, five upstream countries – Ethiopia, Uganda, Kenya, Tanzania, and Rwanda, with Burundi joining in the following year – signed a treaty to share the dam’s resources, formally launching the project in April 2012.

“Ethiopia has the right to use the water flowing through their lands,” Gawad said, “but the policy of the Egyptian government is to not grant them that right. They stick by colonial-era mandates when it is convenient, and throw them by the wayside when it is not.”

A study by the International Fund for Agricultural Development found in 2005 that 98 percent of Egyptian agriculture was irrigated with Nile water or pumped from aquifers renewed by the Nile River flow. Under former president Mohammed Morsi, there was talk of “going to war” if the dam project were to be completed, but officials have since said this option has been ruled out.

Journalists have been arrested for questioning the merits and funding of the dam in Ethiopia, and the country shows no willingness to consider alternative options. Few reliable studies have been carried out on the potential effects of the project, but reducing the amount of water flowing into the water-strapped nation further downstream will inevitably pose risks to its economy and, as a result, its stability.

Unless barriers are built, a rise in sea level would inundate much of Egypt's Nile Delta. Credit: Cam McGrath/IPS.

By Cam McGrath
EL RASHID, Egypt , Jan 29 2014 (IPS)

It only takes a light covering of seawater to render land infertile, so Mohamed Saeed keeps a close watch on the sea as it advances year after year towards his two-hectare plot of land. The young farmer, whose clover field lies just 400 metres from Egypt’s northern coast, reckons he has less than a decade before his field – and livelihood – submerges beneath the sea.

But even before that, his crops will wither and die as seawater infiltrates the local aquifer. The process has already begun, he says, clutching a handful of white-caked soil.

“The land has become sick,” says Saeed. “The soil is saline, the irrigation water is saline, and we have to use a lot of fertilisers to grow anything on it.”“The soil is saline, the irrigation water is saline, and we have to use a lot of fertilisers to grow anything on it.”

Spread over 25,000 kilometres, the densely populated Nile Delta is the breadbasket of Egypt, accounting for two-thirds of the country’s agricultural production and home to 40 million people. Its northern flank, running 240 kilometres from Alexandria to Port Said, is one of the most vulnerable coastlines in the world, facing the triple threat of coastal erosion, saltwater infiltration, and rising sea levels.

According to Khaled Ouda, a geologist at Assiut University, a 30 centimetres rise in sea level would inundate 6,000 square kilometres of the Nile Delta. The flooding would create islands out of an additional 2,000 square kilometres of elevated land, isolating towns, roads, fields, and industrial facilities.

“The total (area of the Delta) expected to be impacted by a rising of the sea level by one metre during this century will be 8,033 square kilometres, which is nearly 33 percent of the total area of the Nile Delta,” Ouda told IPS.

In a report released last September, the International Panel on Climate Change (IPCC) predicts a sea level rise of 28 to 98 centimetres by 2100, more than twice its 2007 projections. Even by the most conservative estimate, this would destroy 12.5 percent of Egypt’s cultivated areas and displace about eight million people, or nearly 10 percent of the population.

But it is not just rising sea levels that threaten Egypt’s northern coast, the delta itself is sinking.

Prior to the building of the Aswan High Dam in the 1960s, more than 120 million tonnes of silt washed down the Nile each year and accumulated in its delta. Without this annual silt flow to replenish it, the Nile Delta is shrinking – in some places the coastline is receding by as much as 175 metres a year.

The Egyptian government has attempted to slow the sea’s advance by building a series of breakwaters and earthen dykes along the northern coast and its waterways. Piles of concrete blocks help reduce coastal erosion, but without new sedimentation, the delta land has compacted and thousands of hectares now lie at sea level.

“You can build all the walls you want, but it won’t stop the seawater from advancing underground,” says Osman El-Rayis, a chemistry professor at Alexandria University. “The saltwater rots fields from below, killing plant roots and leaving behind salts (as it evaporates) that render the soil infertile.”

El-Rayis warns that as the delta substratum becomes more porous, seawater has begun to infiltrate the Nile Delta aquifer, a vital source of underground water spread over 2.5 million hectares.

Saltwater has always been a threat to coastal agricultural land, but salinity was traditionally kept in check by a steady flow of freshwater covering the soil and flushing out the salt. As Egypt’s population has expanded, upstream demand on water has increased, reducing the amount of Nile water that reaches the Delta. What does trickle in these days is choked with sewage and industrial toxins.

Faced with rising water levels and increased salinity, many farmers have abandoned their land or switched to fish farming. Others have resorted to adding sand or soil to their fields to keep them above the brackish water.

“Soil is very expensive, so many farmers buy a truckload of sand and spread it on their field then plant on top of it,” explains Saeed. “But it is difficult to grow anything on sand, so farmers have to use a lot of fertilisers.”

The sand is drawn from the dunes that line much of Egypt’s northern coast and act as natural barriers against the advancing sea. The plundering of these dunes for construction materials and fill has made the Nile Delta more vulnerable to a rise in sea level.

Scientists have proposed measures to protect the Delta lowlands from the sea’s incursion. They say the priority is to slow beach erosion by preserving natural coastal defences such as sand dunes, while building seawalls along the 240-kilometre coast that are strong enough to hold back the Mediterranean.

“These walls would be built facing the sea in places where low-lying gaps occur along the beach,” says Ouda.

He explains that in order to be effective, the barriers must include an impermeable substructure extending from three to 13 metres below sea level that prevents seawater from infiltrating freshwater aquifers.

The size is as formidable as the expected cost. One proposal submitted by Egyptian engineer Mamdouh Hamza put the price tag at three billion dollars. The plan envisions building concrete wall along the Delta’s entire coastline and skirting it with a plastic diaphragm to prevent saltwater seepage.

Ouda says the mega-project would be cost-effective in that it saves the Nile Delta lands, but it is unlikely to attract the necessary capital. He doubts Egypt’s cash-strapped government could cover the costs, while the international community appears unwilling to offer a lifeline.

“The project to establish the coastal walls is a service project…without economic gain and, thus, you will not find a financier for this project from companies or foreign governments,” Ouda says.

Yet some have argued that as Western nations are most responsible for climate change, their governments should foot the bill on behalf of the developing nations most impacted by its consequences.