Understanding Subsidence and Groundwater Management

The video discusses the issue of land subsidence in coastal cities, which is exacerbated by groundwater extraction. It explains how subsidence can lead to increased flooding risks, even more so than sea level rise due to climate change. The video highlights the use of InSAR technology to monitor ground movement and identifies groundwater extraction as a major contributor to subsidence. Solutions such as stricter regulations and managed aquifer recharge are explored, with examples from Jakarta and Coachella Valley. The video concludes with a sponsor message from Trade Coffee.

What is the main issue causing coastal cities to sink faster than sea levels rise?

• Heavy rainfall

• Deforestation

• Groundwater extraction

• Climate change

What technology is used to monitor tiny changes in ground movement?

• Seismograph

• InSAR

• Sonar

• GPS

Which city has experienced subsidence rates as high as 28 centimeters per year?

• London

• Jakarta

• Tokyo

• New York

What is an aquifer?

• A type of rock

• A layer of ground that can hold water

• A deep cave filled with water

• A type of plant

What happens to aquifers when groundwater is extracted?

• They expand

• They collapse and lose water capacity

• They become more porous

• They fill with air

Which city implemented stricter groundwater regulations in 2010?

• Los Angeles

• Jakarta

• Beijing

• Mumbai

What alternative water source did Coachella Valley switch to?

• Lake water

• Colorado River

• Rainwater harvesting

• Desalination

What is managed aquifer recharge?

• Extracting more groundwater

• Pumping water back into the ground

• Building dams

• Using desalinated water

What was the result of managed aquifer recharge in Perth, Australia?

• Ground level decreased

• Ground level remained the same

• Ground level increased by 20 millimeters

• Ground level increased by 50 millimeters

What role do satellites play in addressing subsidence?

• They monitor ground movement

• They extract groundwater

• They prevent subsidence

• They build aquifers