Floods and Droughts - 13 of 12

Floods and Droughts FAQs - 12 Found

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When does a drought begin and end?

The beginning of a drought is difficult to determine. Several weeks, months, or even years might pass before people know that a drought is occurring. The end of a drought can occur as gradually as it began.

The first evidence of drought is usually seen in records of rainfall. Within a short period of time, the amount of moisture in soils can begin to decrease. The effects of a drought on flow in streams and reservoirs may not be noticed for several weeks or months. Water levels in wells might not reflect a shortage of rainfall for a year or more after a drought begins.

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Tags: Groundwater, Droughts, Rivers, Water, Aquifers, Streamgages