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Scientists create a map that shows the impact of recent rains in the Metropolitan Región

The loss of the natural soil infiltration capacity and the absence of an efficient evacuating system for rainwater are also causing that help increase the impact of the last storm, which was classified as weak.

4 July, 2020
in Dissemination, L1. Solid earth processes and associated hazards, L2. Surface water processes and associated hazards, News
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The rain on June 29th broke the extreme drought trend that the Metropolitan Region has been presenting over the last 12 years. A group of researchers from the Research Center for Integrated Disaster Risk Management, CIGIDEN by its initials in Spanish, carried out a data analysis of the impacts of the meteorological phenomenon that occurred last weekend, on June 28th and 29th. This event might reoccur today.

The data analysis and interpretation was conducted by academics and researchers José Saldías (CIGIDEN) and Jorge Gironas (CIGIDEN and academic of the Catholic University of Chile), along with the data collected by Gabriel González, CIGIDEN deputy director, and Felipe Aron, researcher of the same scientific center. This allowed CIGIDEN researchers Francisca Roldán and Erik Jensen to create a map that gathers the impacts on infrastructure caused by the last rains, i.e. multiple flooding spots, road defects and closures across Santiago, rockfalls and channel overflows.

According to the geologist and UCN academic, Gabriel Gonzalez, everything seems to indicates that it was a severe storm. However, “the analysis of data reveals the rain was not a heavy storm, but it is a matter of accumulated precipitation in Quinta Normal (according to the DMC record) of 36.3 mm -36 liters per square meter – with high intensity of 7 mm in 1 hour and a minor intensity 2 mm in 15 hours, which indicates that the storm resembles a rain with a return period of between 5 and 2 years”.

Minor storm

The Urban Element Design Manual classifies this type of rain as a minor storm and stipulates that there should be no system collapse. “Then,” the researcher José Saldias says, “the multiple malfunctions observed show a design defect and reflect that the city is not able to withstand a severe storm, for instance, a rain with extended return periods. This is a wake-up call to improve Santiago’s resilience urgently.

Many floodings that may occur again with the rains forecasted for today are spatially related to channels. “The loss of the natural soil infiltration capacity and the absence of an efficient evacuating system for rainwater also contribute to the increased impact of this storm,” the geologist Felipe Aron affirms.

The map –which will soon be available on an interactive online platform– says the geologist Francisca Roldan, “allows us to visualize in a single space the impacts such as the activation of streams at foothills, floodings, river, and channel overflows, among others, on the Metropolitan Region. Identifying those vulnerable areas that should be strengthened for future events, “this map is a tool designed for disaster risk management,” says the researcher.

COMPLETE MAP IN HIGH RESOLUTION

https://www.cigiden.cl/2020/wp-content/uploads/2020/07/WhatsApp-Video-2020-07-05-at-21.51.14-1.mp4

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      • L1. Solid Earth Processes and Associated Hazards
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      • L5. Socio-Economic Assessment of disasters and Mitigation Strategies for Resilient Critical Infrastructure Systems
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  • SCIENCE COMMUNICATION
      • NEWS
          • CIGIDEN discussion series will address Disaster Risk Management in a pandemic context

            CIGIDEN discussion series will address Disaster Risk Management in a pandemic context

            Scientific analysis identifies communes with more rain damage in Santiago’s urban areas

            Scientific analysis identifies communes with more rain damage in Santiago’s urban areas

            GADRI letter: How will risks and disaster research help us overcome COVID-19?

            GADRI letter: How will risks and disaster research help us overcome COVID-19?

            Researchers identify worst-affected communes by economic risks of COVID-19

            Researchers identify worst-affected communes by economic risks of COVID-19

            Study addresses flash flooding due to extended and heavy rains in Santiago

            Study addresses flash flooding due to extended and heavy rains in Santiago

            Rio Maipo wetland: “Front Line” of protection against extreme waves, storms and tsunamis on the coast

            Rio Maipo wetland: “Front Line” of protection against extreme waves, storms and tsunamis on the coast

      • IN THE MEDIA
          • UC supports chañaral reconstruction: Learn about the contributions the institution has made in Atacama

            UC supports chañaral reconstruction: Learn about the contributions the institution has made in Atacama

      • SOCIAL MEDIA GRAPHICS AND VIDEOS
          • Terremoto en México (en)

            Terremoto en México (en)

      • COLUMNS
          • Chile and Covid-19: we start from scratch

            Chile and Covid-19: we start from scratch

            How to govern a disaster? Dialogue, collaboration and democracy

            How to govern a disaster? Dialogue, collaboration and democracy

            Everyone should act as if we already have the virus

            Everyone should act as if we already have the virus

            Tsunami vertical evacuation should be an option in Chile

            Tsunami vertical evacuation should be an option in Chile

            Waterspouts, disasters and ecological culture

            Waterspouts, disasters and ecological culture

            ¡Welcome to Chile Greta!

            ¡Welcome to Chile Greta!

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