What is Drought?
Drought is a deficiency of water associated with a lack of precipitation. "It is a condition of moisture deficit that is sufficient to have an adverse effect on vegetation, animals and man over a sizeable area" USGS – The Hydrology of Drought. When a normal amount of moisture is not available to satisfy an area's usual water consumption, drought occurs. It begins when soil moisture is so diminished that enough water to replace that lost by transpiration cannot be absorbed by vegetation roots.
In areas that depend on rainfall for their moisture, drought can be defined as a period of insufficient rainfall for normal plant growth. In areas where a large percentage of the surface water comes from melting snowpack, such as in Colorado where this is 80 percent, drought can be defined as: "A period of insufficient precipitation, snowpack and reservoir storage to provide adequate water to urban and rural areas". Colorado State University Extension and Colorado Climate Center.
Why Study Drought?
Drought can occur locally, regionally or statewide. Its occurrence can be slow and last for many years or it can be a short-lived event. In both cases, the impacts can be significant. The interplay between a natural event, demands for water supply and the economic and environmental impacts that can result leads to drought impacts on society. Colorado State University Extension.
If you feel that there are additional websites that are appropriate for this Drought page, please email the webmaster with the URL address.
FREQUENTLY ASKED QUESTIONS
DROUGHT BY STATE
Click on any State in the map below, or on the drop down menu to link to websites pertaining to drought. If you feel that there are additional websites that are appropriate for any given state, please email the webmaster with the URL address.
Click on any State in the map below to link to the interactive drought conditions map and data for the state.
Enter word(s) in the Search text box or leave it blank to conduct a search
- By default, the search engine tries to locate records which match as much as possible all of the words entered in your search query
Opt to sort your results by Publication Year, Subject Category or Document Type
Use the following boolean operators in your search: AND, OR, NOT, TO.
- AND - Narrow search and retrieve records containing all of the words it separates
- OR - Broaden search and retrieve records containing any of the words it separates
- NOT - Narrow search and retrieve records that do not contain the term following it
- TO - Narrow search by specifying a range of dates. The first date goes in the first text box, and the second date goes in the second textbox
Decide which fields to search for your keywords. Leaving it at the default "Anywhere in Record" is the most recommended setting.
- Narrow your search by limiting the records to be searched in one or more subject categories
- Click once to select a Subject Category; click a second time to eliminate the selection
- Most Subject Categories are defined more narrowly by phrases and words that are common agricultural practices and techniques. Click the [+] to view Subject Category definitions
- Narrow your search by limiting the records to be searched in one or more document type(s)
- Click once to select a Document Type; click a second time to eliminate the selection