Water Harvesting Strengthens Food Security in Central America

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Water & Sanitation

Angélica María Posada, a teacher and school principal in the village of El Guarumal, in eastern El Salvador, poses with primary school students in front of the school where they use purified water collected from rainfall, as part of a project promoted by FAO and Mexican cooperation funds. The initiative is being implemented in the countries of the Central American Dry Corridor. CREDIT: Edgardo Ayala/IPS

Angélica María Posada, a teacher and school principal in the village of El Guarumal, in eastern El Salvador, poses with primary school students in front of the school where they use purified water collected from rainfall, as part of a project promoted by FAO and Mexican cooperation funds. The initiative is being implemented in the countries of the Central American Dry Corridor. CREDIT: Edgardo Ayala/IPS

SENSEMBRA, El Salvador , Jun 23 2021 (IPS) – At the school in El Guarumal, a remote village in eastern El Salvador, the children no longer have to walk several kilometers along winding paths to fetch water from wells; they now “harvest” it from the rain that falls on the roofs of their classrooms.


“The water is not only for the children and us teachers, but for the whole community,” school principal Angelica Maria Posada told IPS, sitting with some of her young students at the foot of the tank that supplies them with purified water.

The village is located in the municipality of Sensembra, in the eastern department of Morazán, where it forms part of the so-called Central American Dry Corridor, a semi-arid belt that covers 35 percent of Central America and is home to some 11 million people, mostly engaged in subsistence agriculture.

In the Corridor, 1,600 kilometers long, water is always scarce and food production is a challenge, with more than five million people at risk of food insecurity.

In El Guarumal, a dozen peasant families have dug ponds or small reservoirs and use the rainwater collected to irrigate their home gardens and raise tilapia fish as a way to combat drought and produce food.

“We are all very proud of this initiative, because we are the only school in the country that has a (rainwater harvesting) system like this.” — Angélica María Posada

This effort, called the Rainwater Harvesting System (RHS), has not only been made in El Salvador.

Similar initiatives have been promoted in five other Central American countries as part of the Mesoamerica Hunger Free programme, implemented since 2015 by the United Nations Food and Agriculture Organisation (FAO) and financed by the Mexican Agency for International Development Cooperation (Amexcid).

The aim of the RHS was to create the conditions for poor, rural communities in the Dry Corridor to strengthen food security by harvesting water to irrigate their crops and raise fish.

In Guatemala, work has been done to strengthen an ancestral agroforestry system inherited from the Chortí people, called Koxur Rum, which conserves more moisture in the soil and thus improves the production of corn and beans, staples of the Central American diet.

José Evelio Chicas, a teacher at the school in the village of El Guarumal, in El Salvador's eastern department of Morazán, supervises the PVC pipes that carry rainwater collected from the school's roof to an underground tank, from where it is pumped to a filtering and purification station. The initiative is part of a water harvesting project in the Central American Dry Corridor. CREDIT: Edgardo Ayala/IPS

José Evelio Chicas, a teacher at the school in the village of El Guarumal, in El Salvador’s eastern department of Morazán, supervises the PVC pipes that carry rainwater collected from the school’s roof to an underground tank, from where it is pumped to a filtering and purification station. The initiative is part of a water harvesting project in the Central American Dry Corridor. CREDIT: Edgardo Ayala/IPS

“The best structure for conserving water is the soil, and that is where we have to work,” Baltazar Moscoso, national coordinator of Mesoamerica Hunger Free, told IPS by telephone from Guatemala City.

Healthy schools in El Salvador

The principal of the El Guarumal school, where 47 girls, 32 boys and several adolescents study, said that since the water collection and purification system has been in place, gastrointestinal ailments have been significantly reduced.

“The children no longer complain about stomachaches, like they used to,” said Posada, 47, a divorced mother of three children: two girls and one boy.

She added, “The water is 100 percent safe.”

Before it is purified, the rainwater that falls on the tin roof is collected by gutters and channeled into an underground tank with a capacity of 105,000 litres.

Farmer Cristino Martínez feeds the tilapia he raises in the pond dug next to his house in the village of El Guarumal in eastern El Salvador. A dozen ponds like this one were created in the village to help poor rural families produce food in the Central American Dry Corridor. CREDIT: Edgardo Ayala/IPS

Farmer Cristino Martínez feeds the tilapia he raises in the pond dug next to his house in the village of El Guarumal in eastern El Salvador. A dozen ponds like this one were created in the village to help poor rural families produce food in the Central American Dry Corridor. CREDIT: Edgardo Ayala/IPS

It is then pumped to a station where it is filtered and purified, before flowing into the tank which supplies students, teachers and the community.

The school reopened for in-person classes in March, following the shutdown declared by the government in 2020 to curb the spread of the COVID-19 pandemic.

“We are all very proud of this initiative, because we are the only school in the country that has a system like this,” added the principal.

There are 40 families living in El Guarumal, but a total of 150 families benefit from the system installed in the town, because people from other communities also come to get water.

A similar system was installed in 2017 in Cerrito Colorado, a village in the municipality of San Isidro, Choluteca department in southern Honduras, which benefits 80 families, including those from the neighbouring communities of Jicarito and Obrajito.

Rainwater is filtered and purified in a room adjacent to the classrooms of the school in the village of El Guarumal, in the eastern department of Morazán, El Salvador. Gastrointestinal ailments were reduced with the implementation of this project executed by FAO and financed by Mexican cooperation funds. CREDIT: Edgardo Ayala/IPS

Rainwater is filtered and purified in a room adjacent to the classrooms of the school in the village of El Guarumal, in the eastern department of Morazán, El Salvador. Gastrointestinal ailments were reduced with the implementation of this project executed by FAO and financed by Mexican cooperation funds. CREDIT: Edgardo Ayala/IPS

Vegetable gardens and tilapias boost food security

About 20 minutes from the school in El Guarumal, following a narrow dirt road that winds along the mountainside, you reach the house of Cristino Martínez, who grows tomatoes and raises tilapia in the pond dug next to his home.

The ponds are pits dug in the ground and lined with a polyethylene geomembrane, a waterproof synthetic material. They hold up to 25,000 litres of rainwater.

“The pond has served me well, I have used it for both the tilapia and watering tomatoes, beans and chayote (Sechium edule),” Martínez told IPS, standing at the edge of the pond, while tossing food to the fish.

The cost of the school’s water harvesting system and the 12 ponds totaled 77,000 dollars.

Martínez has not bothered to keep a precise record of how many tilapias he raises, because he does not sell them, he said. The fish feed his large family of 13: he and his wife and their 11 children (seven girls and four boys).

And from time to time he receives guests in his adobe house.

“My sisters come from San Salvador and tell me: ‘Cristino, we want to eat some tilapia,’ and my daughters throw the nets and start catching fish,” said the 50-year-old farmer.

Cristino Martínez and one of his daughters show the tilapia they have just caught in the family pond they have dug in the backyard of their home in the village of El Guarumal in the eastern department of Morazán, El Salvador. The large peasant family raises fish for their own consumption and not for sale. CREDIT: Edgardo Ayala/IPS

Cristino Martínez and one of his daughters show the tilapia they have just caught in the family pond they have dug in the backyard of their home in the village of El Guarumal in the eastern department of Morazán, El Salvador. The large peasant family raises fish for their own consumption and not for sale. CREDIT: Edgardo Ayala/IPS

According to FAO estimates, the ponds can provide about 500 fishes two to three times a year.

The ponds are built on the highest part of each farm, and the drip irrigation system uses gravity to water the crops or orchards planted on the slopes.

Tomatoes are Martínez’s main crop. He has 100 seedlings planted, and manages to produce good harvests, marketing his produce in the local community.

“The pond helps me in the summer to water the vegetables I grow downhill,” another beneficiary of the programme, Santos Henríquez, also a native of El Guarumal, told IPS.

Henríquez’s 1.5-hectare plot is one of the most diversified: in addition to tilapias, corn and a type of bean locally called “ejote”, he grows cucumbers, chili peppers, tomatoes, cabbage and various types of fruit, such as mangoes, oranges and lemons.

“We grow a little bit of everything,” Henríquez, 48, said proudly. He sells the surplus produce in the village or at Sensembra.

However, some beneficiary families have underutilised the ponds. They were initially enthusiastic about the effort, but began to let things slide when the project ended in 2018.

A farmer proudly displays some of the tomatoes he has grown in the region known as Mancomunidad Copán Chortí in eastern Guatemala, which includes the municipalities of Camotán, Jocotán, Olopa and San Juan Ermita, in the department of Chiquimula. Water harvesting initiatives have been implemented in the area to improve agricultural production in this region, which is part of the so-called Central American Dry Corridor. The initiative is supported by FAO and Mexican cooperation funds. CREDIT: FAO Guatemala

A farmer proudly displays some of the tomatoes he has grown in the region known as Mancomunidad Copán Chortí in eastern Guatemala, which includes the municipalities of Camotán, Jocotán, Olopa and San Juan Ermita, in the department of Chiquimula. Water harvesting initiatives have been implemented in the area to improve agricultural production in this region, which is part of the so-called Central American Dry Corridor. The initiative is supported by FAO and Mexican cooperation funds. CREDIT: FAO Guatemala

An ageold Chorti technique in Guatemala

In Guatemala, meanwhile, some villages and communities are betting on an agroforestry technique from their ancestral culture: Koxur Rum, which means “wet land” in the language of the Chortí indigenous people, who also live in parts of El Salvador and Honduras.

The system allows corn and bean crops to retain more moisture with the rains by combining them with furrows of shrubs or trees such as madre de cacao or quickstick (Gliricidia sepium), a tree species that helps fix nitrogen in the soil.

By pruning the trees regularly, leaves and crop stubble cover and protect the soil, thereby better retaining moisture and nutrients.

“Quickstick sprouts quickly and gives abundant foliage to incorporate into the soil,” farmer Rigoberto Suchite told IPS in a telephone interview from the village of Minas Abajo, in the municipality of San Juan Ermita, Chiquimula department in eastern Guatemala, also located in the Central American Dry Corridor.

Suchite said the system was revived in his region in 2000, but with the FAO and Amexcid project, it has become more technical.

As part of the programme, some 150 families have received two 1,500-litre tanks and a drip irrigation system, he added.

“Now we are expanding it even more because it has given us good results, it has improved the soil and boosted production,” said Suchite, 55.

In the dry season, farmers collect water from nearby springs in tanks and, using gravity, irrigate their home gardens.

“Many families are managing to have a surplus of vegetables and with the sales, they buy other necessary food,” Suchite said.

The programme is scheduled to end in Guatemala in 2021, and local communities must assume the lessons learned in order to move forward.

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Chilean Schools Recycle Greywater to Combat Drought

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Water & Sanitation

The principal of the Samo Alto rural school, Omar Santander, shows organic tomatoes in the greenhouse built by teachers, students and their families, who raise the crops irrigated with rainwater or recycled water in Coquimbo, a region of northern Chile where rainfall is scarce. Credit: Orlando Milesi/IPS

The principal of the Samo Alto rural school, Omar Santander, shows organic tomatoes in the greenhouse built by teachers, students and their families, who raise the crops irrigated with rainwater or recycled water in Coquimbo, a region of northern Chile where rainfall is scarce. Credit: Orlando Milesi/IPS

OVALLE, Chile, Jul 4 2019 (IPS) – Children from the neighboring municipalities of Ovalle and Río Hurtado in northern Chile are harvesting rain and recycling greywater in their schools to irrigate fruit trees and vegetable gardens, in an initiative aimed at combating the shortage of water in this semi-arid region.


And other youngsters who are completing their education at a local polytechnic high school built a filter that will optimise the reuse and harvesting of water.

“The care of water has to start with the children,” Alejandra Rodríguez, who has a son who attends the school in Samo Alto, a rural village on the slopes of the Andes Mountains in Río Hurtado, a small municipality of about 4,000 inhabitants in the Coquimbo region, told IPS.

“My son brought me a tomato he harvested, to use the seeds. For them, the harvest is the prize. He planted his garden next to the house and it was very exciting,” said Maritza Vega, a teacher at the school, which has 77 students ranging in age from four to 15.

The principal of the school, Omar Santander, told IPS during a tour of rural schools in the area involved in the project that “the Hurtado River (which gives the municipality its name) was traditionally generous, but today it only has enough water for us to alternate the crops that are irrigated, every few days. People fight over watering rights.”

The Samo Alto school collects rainwater and recycles water after different uses. “The water is then sent to a double filter,” he explained, pointing out that they have a pond that holds 5,000 liters.

The monthly water bill is much lower, but Santander believes that the most important thing “is the awareness it has generated in the children.”

“There used to be water here, and the adults’ habits come from back then. The students help raise awareness in their families. We want the environmental dimension to be a tool for life,” he said.

For Admalén Flores, a 13-year-old student, “the tomatoes you harvest are tastier and better,” while Alexandra Honores, also 13, said “my grandfather now reuses water.”

El Guindo primary school, located 10 kilometers from the city of Ovalle, the municipal seat, in a town known as a hotspot for drug sales, performed poorly in tests until three years ago.

At that time, the principal, Patricio Bórquez, and the science teacher, Gisela Jaime, launched a process of greywater recovery. They also planted trees and native species of plants to adapt to the dry environment of the municipality of 111,000 inhabitants, located about 400 kilometers north of Santiago.

Four students, ages 13 and 14, talk to IPS about how the water reuse project has made them aware of the importance of taking care of water in the semi-arid territory where they live, in a classroom at the rural school of El Guindo, in the municipality of Ovalle, Chile. Credit: Orlando Milesi/IPS

Four students, ages 13 and 14, talk to IPS about how the water reuse project has made them aware of the importance of taking care of water in the semi-arid territory where they live, in a classroom at the rural school of El Guindo, in the municipality of Ovalle, Chile. Credit: Orlando Milesi/IPS

“The project was born because there was no vegetation,” said the teacher. Today they recover 8,000 litres of water a month. “Teaching care for the environment provides a life skill,” said Bórquez.

“Our school had the stigma of being in a place rife with drug addiction. Today in Ovalle we are known as the school with the most programs. We placed third in science,” she said.

Jaime described the experience as “gratifying” because it has offered “tools to grow and create awareness among children and the entire community about the importance of caring for water and other resources.”

Geographer Nicolás Schneider, founder of the “Un Alto en el Desierto” Foundation, told IPS that his non-governmental organisation estimates that one million litres of greywater have been recovered after eight years of work with rural schools in Ovalle.

In this arid municipality with variable rainfall, “only 37.6 mm of rainwater fell in 2018 – well below the normal average for the 1981-2010 period of 105.9 mm,” Catalina Cortés, an expert with Chile’s meteorology institute, told IPS from Santiago.

Schneider describes the water situation as critical in the Coquimbo region, which is on the southern border of the Atacama Desert and where 90 percent of the territory is eroded and degraded.

“Due to climate change, it is raining less and less and when it does, the rainfall is very concentrated. Both the lack of rain and the concentration of rainfall cause serious damage to the local population,” she said.

Innovative recycling filter

With guidance from their teachers, students at the Ovalle polytechnic high school built a filtration system devised by Eduardo Leiva, a professor of chemistry and pharmacy at the Catholic University. The filter seeks to raise the technical standard with which greywater is purified.

Duan Urqueta, 17, a fourth-year electronics student at the Ovalle polytechnic high school, describes the award-winning greywater filter he helped to build. Initially, units will be installed in eight rural schools in this municipality in northern Chile. Credit: Orlando Milesi/IPS

Duan Urqueta, 17, a fourth-year electronics student at the Ovalle polytechnic high school, describes the award-winning greywater filter he helped to build. Initially, units will be installed in eight rural schools in this municipality in northern Chile. Credit: Orlando Milesi/IPS

The prototype recycles the greywater from the bathrooms used by the 1,200 students at the polytechnic high school. This water is used to irrigate three areas with 48 different species of trees. Similar filters will be installed in eight rural schools in Ovalle.

The quality of the recovered water will improve due to the filter built thanks to a project by the Innovation Fund for Competitiveness of the regional government of Coquimbo, with the participation of the Catholic University, the “Un Alto en el Desierto” Foundation, and the Ovalle polytechnic high school.

The prototype was built by 18 students and eight teachers of mechanics, industrial assembly, electronics, electricity and technical drawing, and includes two 1,000-litre ponds.

The primary pond holds water piped from the bathroom sinks by gravity which is then pumped to a filter consisting of three columns measuring 0.35 meters high and 0.40 meters in diameter.

“The filter material in each column…can be activated charcoal, sand or gravel,” said Hernán Toro, the head teacher of industrial assembly.

Toro told IPS that “the prototype has a column with zeolite and two columns of activated charcoal. The columns are mounted on a metal structure 2.60 meters high.”

View of the water cleaning filter designed at the Ovalle polytechnic high school and built by a group of teachers and students with funding from the government of the region of Coquimbo, in northern Chile. Each unit costs 2,170 dollars and it will promote water recycling in the schools in the semi-arid municipality. Credit: Orlando Milesi/IPS

View of the water cleaning filter designed at the Ovalle polytechnic high school and built by a group of teachers and students with funding from the government of the region of Coquimbo, in northern Chile. Each unit costs 2,170 dollars and it will promote water recycling in the schools in the semi-arid municipality. Credit: Orlando Milesi/IPS

The water is pumped from the pond to the filter’s highest column, passes through the filter material and by gravity runs sequentially through the other columns. Finally, the water is piped into the secondary pond and by means of another electric pump it reaches the irrigation system.

Duan Urqueta, a 17-year-old electronics student, told IPS that they took soil and water samples in seven towns in Ovalle and “we used the worst water to test the filter that is made here at the high school with recyclable materials.”

In 2018, “we won first place with the filter at the Science Fair in La Serena, the capital of the region of Coquimbo,” he said proudly.

Pablo Cortés, a 17-year-old student of industrial assembly, said the project “changed me as a person.”

Toro said the experience “has been enriching and has had a strong social impact. We are sowing the seeds of ecological awareness in the students.”

“It’s a programme that offers learning, service, and assistance to the community. Everyone learns. We have seen people moved to the point of tears in their local communities,” the teacher said.

Now they are going to include solar panels in the project, which will cut energy costs, while they already have an automation system to discharge water, which legally can only be stored for a short time.

Eight schools, including the ones in Samo Alto and El Guindo, are waiting for the new filters, which cost 2,170 dollars per unit.

Schneider believes, however, that at the macro level “water recycling is insufficient” to combat the lack of water in this semi-arid zone. And he goes further, saying “there is an absence of instruments for territorial planning or management of watersheds.”

“Under the current water regulatory framework, the export agribusiness, mainly of fruit, has taken over the valleys, concentrating water use…and the government turns a blind eye,” he complained.