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USGS IN YOUR STATE

USGS Water Science Centers are located in each state.

There is a USGS Water Science Center office in each State. Washington Oregon California Idaho Nevada Montana Wyoming Utah Colorado Arizona New Mexico North Dakota South Dakota Nebraska Kansas Oklahoma Texas Minnesota Iowa Missouri Arkansas Louisiana Wisconsin Illinois Mississippi Michigan Indiana Ohio Kentucky Tennessee Alabama Pennsylvania West Virginia Georgia Florida Caribbean Alaska Hawaii New York Vermont New Hampshire Maine Massachusetts South Carolina North Carolina Rhode Island Virginia Connecticut New Jersey Maryland-Delaware-D.C.

Texas Drought Watch

Below normal 7-day average streamflow compared to historical streamflow for the day of the year

Based on about 280 USGS sites in Texas having at least 30 years of record. The data used to produce this map are provisional.

Map of below normal 7-day average streamflow compared to historical streamflow for the day of year.

enlarge Click image to view larger, interactive version of the map.

Map legend for below normal 7-day average streamflow condition map

The U.S. Geological Survey Texas Water Science Center continuously monitors the status of the State's principal rivers, reservoirs, and selected aquifers. Stations with long-term continuous record are used to compare existing streamflows, reservoir storage, and ground-water levels with normal and extreme recorded values to measure the potential for drought, or the severity of an existing drought.

More detailed information on drought in Texas is available for:

Surface water | Groundwater | Climate | Reservoirs

Quick Links

Texas Drought Publications

SIR 2013-5113 PP 372-C

USGS Publications Warehouse: Texas drought publications

About Drought

Definitions of Drought

Droughts do not have the same meaning or significance to all people. No generally accepted definition is adequate, nor is one practical, because drought is the result of many different factors. Three common definitions are:

  1. Meteorological drought: "A period of abnormally dry weather sufficiently prolonged for the lack of water to cause serious hydrologic imbalance in the affected area".Huschke, R.E., ed., 1959, Glossary of meteorology: Boston, American Meteorological Society, 638 p.1
  2. Agricultural drought: "A climatic excursion involving a shortage of precipitation sufficient to adversely affect crop production or range production".Rosenberg, N.J., ed., 1979, Drought in the Great Plains- Research on impacts and strategies: Proceedings of the Workshop on Research in Great Plains Drought Management Strategies, University of Nebraska, Lincoln, March 26-28: Littleton, Colorado, Water Resources Publications, 225 p.2
  3. Hydrologic drought: "A period of below average water content in streams, reservoirs, aquifers, lakes, and soils".Yevjevich, Vujica, Hall, W.A., and Salas, J.D., eds., 1977, Drought research needs, in Proceedings of the Conference on Drought Research Needs, December 12-15, 1977: Colorado State University, Fort Collins, Colorado, 276 p.3

Assessing Hydrologic Drought Severity

In general, when the water content in streams, reservoirs, aquifers, or soils falls below the long-term average, a pending or potential hydrologic drought may exist. The severity of a hydrologic drought is not always obvious until these water supplies are seriously depleted. The USGS network of long-term continuous record stations is important in measuring the severity of an existing or potential drought and making projections of subsequent drought conditions.



Text modified from Hanson, R. L., 1987, Base flow as an indication of drought occurrence. In: S, Subitzky (ed.), Selected Papers in the Hydrologic Sciences: U.S. Geological Survey Water Supply Paper 2330. pp. 115-129.

1 Huschke, R.E., ed., 1959, Glossary of meteorology: Boston, American Meteorological Society, 638 p.

2 Rosenberg, N.J., ed., 1979, Drought in the Great Plains- Research on impacts and strategies: Proceedings of the Workshop on Research in Great Plains Drought Management Strategies, University of Nebraska, Lincoln, March 26-28: Littleton, Colorado, Water Resources Publications, 225 p.

3 Yevjevich, Vujica, Hall, W.A., and Salas, J.D., eds., 1977, Drought research needs, in Proceedings of the Conference on Drought Research Needs, December 12-15, 1977: Colorado State University, Fort Collins, Colorado, 276 p.

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