Understanding the resilience of Mexico City to future water crises
Long-term solutions for water poverty in one of the world's largest cities in the face of climate change and a growing population.
25/01/2022
Mexico City is one of the world’s largest cities and its population, geographical setting and aging infrastructure have put its natural water reserves at risk. Climate change and a growing population are forecast to put further strain on these reserves, making water crises and water poverty increasingly common. Long-term solutions need to look beyond purely technical water-management solutions and integrate sociological processes into future practices.
Socio-hydrological resilience
Socio-hydrology looks at the interactions between people and water, and provides a holistic platform to better understand the impacts of water-management practices.
Making cities more socio-hydrologically resilient reduces the potential for water crises in the future. Working with the Architectural Association’s School of Architecture and the Centre for Advanced Spatial Analysis at UCL, BGS developed a tool for assessing the socio-hydrological resilience of cities, both currently and under various scenarios. This tool allows decision makers to assess the impact of changing water-management practices.
With guidance from local stakeholders, the team looked at how different climate change scenarios could impact the socio-hydrological resilience of the city and how the development of household-scale wetlands across the city could improve this resilience. These ‘constructed wetlands’ consist of small areas of vegetation, soil and organisms engineered to act as a biofilter and remove pollutants from water. They provide a decentralised, sustainable way to treat waste water, reducing disease and the need for infrastructure maintenance whilst improving access to green infrastructure, thus providing ecological benefit.
Example of a constructed wetland in Mexico City. © Fluxus 2021.
Mexico City today
The socio-hydrological resilience of Mexico City is currently divided into two main areas: the central and western parts of the city are generally more resilient, whilst the eastern, northern and southern neighbourhoods are less so. In the east and north, this lower resilience is attributed to a reduced capacity for society to adapt to water crises, but in the south, there is greater natural stress on water resources.
Under today’s climate, the development of constructed wetlands across the city has the potential to decrease the number of people vulnerable to water poverty by 32 per cent (around six million people). Wetlands also have the ability to decrease the number of highly vulnerable people by 0.5 million.
Image showing the socio-hydrological resilience of Mexico City. The dark red regions are less resilient and the light yellow more resilient to social and water-related stress. © Architectural Association.
Mexico City in the future
By 2050 and with no improvements to water sustainability, the project found around four million people in Mexico City will move from low to moderate vulnerability. These people will have greater difficulty gaining access to a reliable, clean water supply. In addition to this, around seven in every ten people in the city would be classed as highly vulnerable, meaning that they are highly unlikely to have a secure water supply. By optimising the development of constructed wetlands, the team found that socio-hydrological resilience can be improved in the future, bringing levels in line with those that we see today.
Although constructed wetlands have the ability improve socio-hydrological resilience across Mexico City, they will need to be combined with other, decentralised green-blue infrastructure, such as rain-harvesting systems, to further improve resilience in the future.
You can find out more about the project and access the open-source tool by visiting www.mexicoshr.com.
Partners and funding
This project was funded by British Council Institutional Links and developed in collaboration with the Architectural Association School of Architecture and the Bartlett Centre for Advanced Spatial Analysis (CASA), a research centre at University College London.
About the author
Dr Andrew Barkwith
Principal numerical modeller and smart observing systems lead
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