May 2, 2016
MEXICO CITY, MEXICO ─ Almost every day, water comes to the Razón y Fuerza de la Revolución Mexicana primary school via tanker truck.
That’s because the water supplied through the public network is neither consistent nor sufficient, says Edith Huerta Anguiano, the school’s principal.
Mayela Sánchez, GPJ Mexico
But during the rainy season, which in Mexico City, the nation’s capital, takes place from May to October, there’s another option: A system collects rainwater and filters it for use in the school’s bathrooms. Installed in September 2014 by the Iztapalapa campus of Universidad Autónoma Metropolitana, a university, the system is part of a citywide trend to capture and use rainwater.
Juan José Santibáñez Santiago has led the university’s rainwater capture project since 2012.
The project was created to offer an alternative water supply for people living in the eastern borough of Iztapalapa, and focuses on helping schools in the area, he says. The university’s research found that children increasingly deal with an insufficient water supply, he says.
In Mexico City alone, there are more than 120 preschool, primary and secondary public schools that use water provided through means other than the public network, according a 2013 census by the government’s statistics institute.
Since 2012, the university has installed 26 rainwater capture systems in public schools in different boroughs, Santibáñez Santiago says.
Among those are Huerta Anguiano’s school, where she says 421 students, along with staff members, use about 6,000 liters (1,585 gallons) of water daily.
The supply of water in this school’s neighborhood is lacking. But when the school’s rainwater collection system is operational, the amount of water used from the public network or from the tanker trucks is cut by almost half, Huerta Anguiano says.
The rainwater is only used for flushing, says María del Carmen Andrade Farfán, the vice principal.
The captured water comes from the schoolyard and the sloped roof of a building, says Andrade Farfán. There are tubes that connect the rainwater to a filter formed by four layers of rocks and quartz sand that purify the rain before storing it in an underground cistern.
That cistern can hold 6,000 liters, Huerta Anguiano says.
The installation and maintenance of the rainwater collector system are funded by the university, says Huerta Anguiano.
María Fernanda Lima Ayala is a fifth grader at the school. The 10-year-old thinks it’s a good thing that the school takes advantage of rainwater.
“We recover more water and we don’t waste it so much,” she says. “Maybe it doesn’t always rain, but it rains.”
Her twin sister, Aranza Lima Ayala, agrees.
“It’s good because like that we can collect more water, and it would be, like, free because it comes from above,” she says.
Mayela Sánchez, GPJ Mexico
Ultimately, Santibáñez Santiago hopes his project will be able to replenish school drinking fountains with clean rainwater. So far, the project has installed drinking fountains at six schools and is in the process of installation at three more, he says. For now, the water in these drinking fountains comes from the public network, because Santibáñez Santiago is still testing the quality of filtered rainwater to assure it is drinkable, he says.
At the Universidad Nacional Autónoma de México (UNAM), another university, the Programa Universitario de Estrategias para la Sustentabilidad, a program on sustainability strategies, created a system two years ago to collect and store rainwater to be used as drinking water, says the program’s coordinator Mireya Ímaz Gispert.
A drinking fountain that uses rainwater was installed and is available for the entire university community to use, she says. Each month, staff from the Instituto de Geología, a geology institute, and from the Dirección General de Servicios Médicos, the general administration of medical services, at the university test the water to ensure it is still safe for drinking, Ímaz Gispert says.
The system captures the water that falls on the roof of the building through gutters, which connects water to a filtration and disinfecting system. The water, which is stored in a cistern, is ultimately filtered four times and disinfected twice, according to a diagram provided by Isla Urbana, the organization that installed the system. The 10,000-liter (2,642-gallon) cistern provides water to a water fountain and to the program’s headquarters office, Ímaz Gispert says.
Even though the campus in Mexico City doesn’t have water supply problems, Ímaz Gispert says, the purpose of the project is to replicate the system at other campuses belonging to the university that struggle to maintain water supply.
In addition to installing the rainwater collector and filtration system, Isla Urbana is helping to test the water quality, says David Vargas, president of Isla Urbana.
Mayela Sánchez, GPJ Mexico
Isla Urbana has worked to install rainwater capture systems in homes, businesses and schools for the last six years, Vargas says.
Last year, Mexico’s President Enrique Peña Nieto announced an initiative to improve infrastructure in more than 33,000 school buildings. The project includes sanitation and drinking water systems, according to the initiative’s website.
However, the guidelines for installing the drinking fountains include rainwater collection as a water supply source.
In February, Mexico City’s Mayor Miguel Ángel Mancera Espinosa announced a program to install 300 rainwater collector systems in houses and soup kitchens under his government’s purview.
Isla Urbana is installing the collector systems, Vargas says.
Josué David Bello uses the rainwater fountain at UNAM two or three times a week, he says. When the 23-year-old chemistry student does use it, he fills up a water bottle of almost one liter from which he drinks while he eats.
He thinks it’s a good thing that the university creates projects that promote sustainability.
“It’s great that the resources are taken advantage of, and people are taught the significance of sustainability to resolve their needs.”
Natalia Aldana and Rishi Khalsa, GPJ, translated this article from Spanish.