Water by Design: Water Underground

The video explores global water challenges and solutions, focusing on Southern California's efforts to conserve water. It highlights Orange County's innovative groundwater replenishment system, which transforms sewage into drinking water through a three-stage purification process. The process mimics the natural water cycle, ensuring sustainable water management.

What is the main focus of EarthEcho's expeditions?

• Exploring space innovations

• Studying wildlife conservation

• Developing new agricultural techniques

• Finding solutions to water challenges

What is one of the large-scale solutions Southern California has invested in?

• Desalination of ocean water

• Rainwater harvesting

• Importing water from distant sources

• Building new dams

What is the first stage of the water treatment process in Orange County?

• Chemical disinfection

• Ultraviolet light treatment

• Microfiltration

• Reverse osmosis

Why is it important to replenish the groundwater basin in Orange County?

• To increase water temperature

• To prevent reliance on imported water

• To reduce water hardness

• To improve water taste

What percentage of water demands can be met by the groundwater basin in Orange County?

• 90%

• 75%

• 60%

• 50%

What is the size of the holes in the microfiltration membranes?

• 1/100th the diameter of a human hair

• 1/200th the diameter of a human hair

• 1/300th the diameter of a human hair

• 1/400th the diameter of a human hair

What problem does the system of wells installed in 1976 address?

• Pollution from industrial waste

• Excessive water evaporation

• Seawater intrusion into groundwater

• Flooding in urban areas

What is the purpose of the ultraviolet light in the water treatment process?

• To add minerals to the water

• To change the water's pH level

• To cool down the water

• To disinfect and render small molecules harmless

How long does it take for sewage water to become drinkable in the Orange County system?

• 1 day

• 3 days

• 1 week

• 4 hours

What natural process does the Orange County water treatment system mimic?

• Rock formation

• Soil erosion

• Natural water cycle

• Photosynthesis