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Cropland Irrigation Water Source, 1992

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Description

This pie map contains a pie chart for each state and the nation. The pie slices reflect acres of irrigated Cropland using various water sources. The water sources are categorized by 1) Well (orange), 2) Pond, Lake, or Reservoir (light green), 3) Stream, Ditch, or Canal (brown), and 4) a combination of sources (dark green). Data values of 1% or less are not shown. Lagoon and Other Wastewater is not shown as a source since it makes up less than 1% of the national total. The size of the pies is proportional to the amount of irrigated Cropland. There are 62.3 million acres of irrigated cropland.

Cautions for this Product:
The national pie is not proportional to the state pies. Irrigation of land uses other than cropland is not included.



Sources

Source: National Resources Inventory, 1997
Distributor: USDA-NRCS-RIAD
Reliability:
NRI sample data are generally reliable at the 95% confidence interval for state and certain broad substate area analyses. Generally, analyses that aggregate data points by smaller geographic areas and/or more specific criteria result in fewer data points for each aggregation and therefore less reliable estimates. NRI maps reflect national patterns rather than site- specific information.


Layers

Aggregate Layer: State
Other Layers Displayed:


Definitions

Canal:
An artificial waterway used for irrigation. [NRI- 97]

Cropland:
A Land cover/use category that includes areas used for the production of adapted crops for harvest. Two subcategories of cropland are recognized: cultivated and noncultivated. Cultivated cropland comprises land in row crops or close-grown crops and also other cultivated cropland, for example, hayland or pastureland that is in a rotation with row or close-grown crops. Noncultivated cropland includes permanent hayland and horticultural cropland. [NRI-97]

Ditch:
A long, narrow trench or furrow dug in the ground, as for irrigation. [NRI-97]

Irrigated land:
Land that shows evidence of being irrigated during the year of the inventory or during two or more years out of the last four years. Water is supplied to crops by ditches, pipes, or other conduits. Water spreading is not considered irrigation; it is recorded as a conservation practice. [NRI-97]

Lagoon - waste treatment:
An impoundment made by excavation or earthfill for biological treatment of animal or other agricultural waste. [NHCP]

Lake:
An inland body of water (fresh or salt) of considerable size occupying a basin or hollow on the earth's surface, and which may or may not have a current or single direction of flow. [ASCE- "Nomenclature for Hydraulics"]

Stream:
A flow of water in a channel or bed, as a brook, rivulet, or small river. [NRI-97]

Well:
A hole drilled or bored into the earth providing access to water. [NRI-97]


Product Information

Product ID: 5947
Production Date: 2/8/01
Product Type: Map


For additional information contact the Resources Inventory and Assessment Division. Please include the Product ID you are inquiring about. nri@wdc.usda.gov or 1400 Independence Avenue SW - P.O. Box 2890 - Washington D.C. 20013. If you use our analysis products, please be aware of our disclaimer.