The USGS provides science about natural hazards that threaten lives and livelihoods; the water, energy, minerals, and other natural resources we rely on; the health of our ecosystems and environment; and the impacts of climate and land-use change. Our scientists develop new methods and tools to supply timely, relevant, and useful information about the Earth and its processes. Learn more below.
Science Topics
FAQs
Why doesn't a drought end when it rains?
Rainfall in any form will provide some drought relief. A good analogy might be how medicine and illness relate to each other. A single dose of medicine can alleviate symptoms of illness, but it usually takes a sustained program of medication to cure an illness. Likewise, a single rainstorm will not break the drought, but it might provide temporary relief. A light to moderate shower will probably...
Where in the Nation are droughts or very low flows occurring now? How can I see these sites on a map and get to the data?
To view the USGS streamflow information on drought, see the drought map on our WaterWatch site, which shows below-normal, 7-day average streamflow compared to historical streamflow for the United States. Links to additional maps and drought data are listed on the USGS Drought website and the National Integrated Drought Information System (NIDIS).
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...
Education
Our Water Our Lives: Floods
This Teacher Guide includes background information, lesson plans, and examples of student answers for four lessons about floods. The Student Worksheet includes student activities and questions. This can be downloaded and printed or transferred to a digital classroom document.
Our Water, Our Lives: California
This Teacher Guide includes background information, lesson plans, and examples of student answers for four lessons about water resources in California. The Student Worksheet includes student activities and questions. It can be downloaded and printed or transferred to a digital classroom document.
Our Water, Our Lives: The Chesapeake Bay Watershed
This Teacher Guide includes background information, lesson plans, and examples of student answers for three lessons about the Chesapeake Bay watershed. The Student Worksheet includes student activities and questions. This can be downloaded and printed or transferred to a digital classroom document.