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USGS Frequently Asked Questions

FAQ's about Drought

What causes drought?
What is “El Nino” and what are its effects?
When does a drought begin?
What can cause water levels in wells to change?
Why doesn't a drought go away when it rains?
What is the Palmer Index?
Does a shortage of rain mean that a drought will occur?
Why does the USGS collect streamflow data?
What determines if a well will go dry?
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