When does a drought occur

Explanation:

Droughts have a variety of effects on individuals.
All living things need clean drinking water, and water supplies may be depleted during a drought.
People must bring in enough water from elsewhere to survive if there is no water.
These water sources are depleted and may even dry up during a drought, preventing crops from being irrigated and leading them to perish.

Final Answer:

Droughts occur when a lack of rain is there for an extended length of time.