A call for technology to guard groundwater | Lauren Mason Carris | TEDxSaltLakeCity

Key Concepts

• Aquifer: An underground layer of permeable rock, sediment, or soil that holds and transmits groundwater.
• Groundwater: Water held underground in the soil or in pores and crevices in rock.
• Cenote: A natural pit or sinkhole resulting from the collapse of limestone bedrock that exposes groundwater underneath.
• Subsidence: The sinking or settling of the ground surface, often caused by the excessive withdrawal of groundwater.
• Electromagnetic Surveys: Geophysical methods used to map subsurface geological structures and properties, including the presence and characteristics of aquifers.
• Hydrologist: A scientist who studies the movement, distribution, and quality of water on Earth and other planets, including the hydrologic cycle, water resources, and environmental sustainability.

The Vital Role and Invisible Threat of Groundwater

The video begins with a personal anecdote about descending into a cenote in Mexico's Yucatan jungle, highlighting the awe-inspiring experience of connecting with a hidden, ancient reservoir of water. This experience serves as a powerful metaphor for understanding the significance of groundwater, which, though less visually dramatic, is equally vital to life.

Groundwater: A Vast and Essential Resource

• Global Significance: Groundwater constitutes 97% of the world's usable fresh water, with 60 times more groundwater than lakes and rivers combined. This volume is so immense it could submerge all continents under 10 feet of water.
• Human Reliance: This resource is tapped through wells for critical uses including agriculture, landscaping, drinking water, and industry. In the US alone, the daily groundwater withdrawal is equivalent to nearly 125,000 Olympic swimming pools.

The Variability and Vulnerability of Aquifers

• Regional Differences: Aquifers are not uniform; their characteristics vary significantly by region. Some recharge rapidly with storms, while others contain water thousands of years old.
• Age of Groundwater: In the Salt Lake Valley, some groundwater is as young as three years old, whereas near Utah's western desert, aquifer water can be as old as 8,000 years.
• Overuse and Decline: Despite its renewable potential, groundwater is susceptible to overuse. In Utah, over 80% of monitored aquifers are currently in decline, with some distressed areas experiencing underground levels dropping at twice the historical average rate due to human activity.

The Perilous Consequences of Groundwater Depletion

• Subsidence: When groundwater levels drop too low, the overlying earth can sink. This process, known as subsidence, occurs as the aquifer compresses and its storage space collapses.
• Permanent Damage: Subsidence permanently damages aquifers, rendering them unable to store water in the future. The example of California's Central Valley, where some areas have dropped nearly 30 feet in the last century due to excessive pumping, illustrates the severity of this issue.
• Cascading Impacts: The consequences of groundwater depletion extend beyond water loss:
  • Economic Strain: Drying wells necessitate deeper drilling, increasing costs for rural communities.
  • Water Scarcity: Families, animals, and farms face severe water shortages.
  • Infrastructure Damage: Sinking land can damage roads and buildings.
  • Ecological Disruption: Wetlands vanish, and ecosystems unravel.
• Interconnectedness: Surface water and groundwater are intrinsically linked; the loss of one inevitably impacts the other. Unlike surface water bodies, aquifers lack visible warning signs, making their depletion insidious.

The Path Forward: Preservation and Innovation

• Renewable Potential: Aquifers are insulated from evaporation and recharged by precipitation, making them renewable resources if managed properly.
• Current Preservation Efforts: Progress is being made through initiatives like pipe repairs, smart irrigation, lawn conversions, and the restoration of the Great Salt Lake, all of which help reduce the draw on groundwater.
• The Shift Towards Innovation: The video advocates for a shift from mere preservation to active innovation in groundwater management.

Technological Advancements in Groundwater Monitoring

• Advanced Scanning: Scientists at the Utah Geological Survey employ electromagnetic surveys, akin to an MRI for the Earth, to scan aquifers.
• Satellite Monitoring: NASA and climate scientists utilize satellites to track groundwater loss.
• Real-time Data: Sensors in wells provide hydrologists with real-time data.
• Digital Data Management: Digital tools are used to collect, share, and map groundwater data, indicating its location, usage patterns, and changing levels. Much of this data is publicly accessible.

Challenges and Opportunities in Groundwater Management

• Cost of Technology: While the science is robust, the necessary tools are expensive. In 2024, less than 1% of the total water budget was allocated to groundwater solutions.
• The Invisibility Problem: Groundwater's inherent invisibility makes it easy to overlook and difficult to advocate for.
• Need for Predictive Models: Models are crucial to understand groundwater movement, its reaction to stress, and its recharge rates, moving beyond reliance on hope.
• Education and Behavior Change: Education and behavioral shifts are essential at the household level. Cities offer tools like smart irrigation, leak alerts, and lawn rebates, but framing conservation as a competition can be counterproductive.

Harnessing Technology for Engagement and Action

The video proposes innovative ways to make groundwater more relatable and actionable:

• Personalized Impact Notifications: Mobile app notifications could inform users about their water savings, quantifying the impact in relatable terms (e.g., "You saved 2,000 gallons this month. That's enough water to supply a family in a small Utah town for nearly a week.").
• Visualizing Groundwater Levels: Visualizing the groundwater supplying a zip code as a lake that rises or falls based on neighborhood usage could spark community conversations.
• Engaging Communication: Presenting water usage data in attractive, easy-to-understand designs could encourage sharing and engagement.
• Personalized Innovation Ideas: Apps could offer tailored suggestions for changing water usage, empowering individuals to make informed decisions.

A Call to Innovators

The video concludes with an open invitation to technologists, data scientists, and innovators to contribute their talents to addressing the urgent challenge of groundwater protection. The goal is to build tools, stories, and systems that make the invisible groundwater visible, fostering informed communities and invested stakeholders.

Conclusion: Making the Invisible Visible

The speaker emphasizes that by making groundwater visible through emerging technology, we can ensure it remains a protected resource. The experience in the cenote underscores the profound connection to something larger than ourselves, a connection that extends to the vital water beneath our feet. The generation that refuses to let the invisible be forgotten will be the one that secures our future by protecting what sustains us below the surface.