What Happens When a Reservoir Goes Dry?

Summary by Krater

This video examines how water supply reservoirs function, why drought affects them, and why an empty reservoir is not necessarily a bad thing, concluding that the purpose of storage is to buffer variability rather than to guarantee a full pool under all conditions.

From the video

Answers: Why do water reservoirs run low or empty and what happens when they do?

• water supply reservoirs
• firm yield of water sources
• reservoir storage and management
• megadrought in the American Southwest
• Colorado River Basin
• Optima Lake Dam history

What it concludes

• The past two decades have been the driest period in more than a thousand years for the southwestern United States, leading to a megadrought.
• A reservoir does not create water; it only stores what is already there, meaning capacity does not contribute to yield if inflow decreases.
• Not using the entire storage volume available can be considered a lack of good stewardship, and reservoirs should be empty sometimes.
• Water availability is mostly an economic issue rather than a physical shortage of water, as utilities spend more money on infrastructure and alternative sources.