Climate Change Water Resources & Conservation 3

Question 1

What is the primary cause of the Ogallala Aquifer's depletion, and how does climate change worsen the problem?

Accepted Answer

Extraction for irrigation far exceeds natural recharge rates; warming increases crop water demand

Answer

The Ogallala is pumped orders of magnitude faster than it refills naturally, and hotter, drier conditions under climate change raise the amount of water crops require.

Question 2

Lake Mead, the largest U.S. reservoir, has repeatedly hit historically low levels. What primary factor drives this trend?

Accepted Answer

A combination of reduced Colorado River inflows and sustained high regional demand

Answer

Prolonged drought cutting snowmelt contributions paired with heavy municipal and agricultural withdrawals from the Colorado River system has driven Lake Mead to record lows.

Question 3

Which practice is called 'managed aquifer recharge' and why is it increasingly important under climate change?

Accepted Answer

Intentionally directing surplus surface water into the ground to replenish underground aquifers

Answer

Managed aquifer recharge captures flood or excess water and channels it underground for storage, helping buffer against the dry periods that climate change is making more frequent.

Question 4

How does urban heat island effect compound water stress in cities?

Accepted Answer

It raises local temperatures, boosting evaporation and increasing outdoor water demand for cooling and irrigation

Answer

Urban heat islands push local temperatures several degrees higher, which amplifies evaporative demand from landscapes and increases human water use for cooling.

Question 5

What does a 'Day Zero' event mean in the context of municipal water supply?

Accepted Answer

The projected date when a city's reservoir supply drops so low that taps are shut off

Answer

Day Zero, famously faced by Cape Town in 2018, is the point at which reservoir levels fall so critically low that municipal water distribution must be cut off.

Climate Change Practice Test

Climate Change Practice Test

Climate Change Water Resources & Conservation 3