Journalists join with hackers and scientists to report on water quality

بواسطة Gustavo Faleiros
Oct 30, 2018 في Miscellaneous
people with computers

In Brazil, rapid urbanization appears to be contaminating the water supply. It's an important story, but often there isn't much hard evidence available for journalists to report. That's why they're starting to collect their own evidence, says data journalist Gustavo Faleiros.

InfoAmazonia, the environmental news site which Faleiros founded during his recent ICFJ Knight International Journalism Fellowship, is leading a project that will give water-quality sensors to people living in the affected areas. A simple test will reveal whether or not their water is drinkable. The sensors will send that data back to InfoAmazonia, and it will appear on a map of the region. Residents can also sign up to receive text messages that will tell them if it’s safe to drink the water in their neighborhoods.

As part of that project, a group of journalists, programmers, researchers, activists and others recently got together to decide how to best gather and share that data, Faleiros writes in this post, first published on the InfoAmazonia site: 

Concerned with the current water crisis in Brazil, professionals from several different fields of study met at the event “Hackathon: Data and Sensors to Measure Water Quality,” promoted by a Rede InfoAmazônia team. The purpose of the meetings, which took place in São Paulo on September 5 and 15, was to discuss alternative ways to monitor water quality (like low-cost sensors) and to disseminate that data efficiently and reliably.

The first meeting was focused on the Amazon and the second on São Paulo's diminishing water reserves. In total, 60 people participated, among them researchers, water resources consultants, programmers, journalists and activists. They have split themselves in two research paths: free hardware development and public data.

The hardware initiative was led by researcher and free hardware developer Ricardo Guima. For Guima, the creation of low-cost sensors is a challenge in the face of the copyrighted equipment currently used for environmental monitoring. He believes developing those sensors guarantees data reliability from gathering to publishing. 

The public data group, which I led, worked on combining public databases on health and sanitation in order to publish analysis through maps and infographics on the Internet. Such work has generated portals Visaguas and, two applications that broadcast data about the quality and availability of water in the Amazon and in São Paulo, respectively.

Activists Rodrigo de Luna and Maru Whately presented the platform “Cidade Democrática” as an example of citizen involvement in public policies, like those related to the water crisis in São Paulo. They also showed how data visualization might be a key factor in articulation and encouragement of proposals.

Sensor development

At the meetings, participants talked about water analysis methodologies that use larger sample rates than those currently employed by official institutions in the “Amazonia Legal,” the largest Brazilian socio-geographic division in the Amazon Basin.

The discussion was led by experts in water-quality monitoring. Participants also relied on citizen science literature available online, which describes similar projects that have faced well-known obstacles to those who work with sensors.

Some participants concluded that systems of autonomous sensors, since they remain exposed to weather, may face some difficulties when meeting strict standards of data gathering. For instance, the fact that the chemical electrode needs to remain in the water for about a month increases significantly the inaccuracy of the data acquired. Ricardo Guima suggested some alternatives presented by the group to solve the issue:

"A system capable of pumping a volume of water in an internal chamber in the sensor’s box was suggested, and we decided to investigate technologies that could read data through in-vitro techniques. The project has developed a flair for using a spectrometry micro-laboratory (a technique that uses light to measure concentrations in solutions through interactions of light with matter). For many collaborators from São Paulo who wanted a system to analyze their own water at home, this solution is feasible, but to put a spectrometry micro-lab adrift in a river, lake or reservoir is definitely a challenge. The system would need minimum collaboration with the local community."

InfoAmazonia has designed hardware, to be launched in the end of this year, that uses simpler sensors that could meet the minimum requirements of data gathering. This way, it will be possible to articulate with the local communities a group to analyze the water using sensors as those from spectrometry built with free hardware.

Related reading: Using sensors to test and report on water quality in fast-urbanizing Amazon cities

This post originally appeared in Portuguese on the blog of InfoAmazonia. Taisa Sganzerla translated it from Portuguese into English for Global Voices, which published it through a content partnership. The English translation appears on IJNet under a Creative Commons license.

Photo credit: Bruno Fernandes/InfoAmazonia.