Montana Surface Water Supply (SWSI) Drought Index Areas, 1992-1999
MSDI
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| Data Provider
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Montana State Library
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| Date
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1992
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| Content Type
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Offline Data
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| Abstract
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This layer shows areas of Montana for which staff of the Montana Office of the Natural Resources Conservation Service (NRCS) calculate a monthly Surface Water Supply Index (SWSI) value. The SWSI is determined for areas that rely on snow melt as the primary source of surface water. The regions were derived from 4th-code subbasin hydrologic unit boundary (HUC) data, modified based on input from NRCS personnel. Some SWSI areas are arbitrary-width, uniform buffers along streams, some are one or more HUCs, and some are truncated HUCs. Polygons in this layer whose NAME field is blank are not SWSI areas.This version of the layer was used from 1994 to 1999 to make the maps shown on the SWSI web pages of the State Library web site. In 2000 the areas were redefined, and some time after that the pre-2000 SWSI values were recalculated for the new areas and the old web site maps based on these areas were replaced with maps of the new areas.This copy of the layer contains SWSI data values for February 1992 through February 1995.
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| Purpose
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| Supplemental Information
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The Montana State Library provides this product/service for informational purposes only. The Library did not produce it for, nor is it suitable for legal, engineering, or surveying purposes. Consumers of this information should review or consult the primary data and information sources to ascertain the viability of the information for their purposes. The Library provides these data in good faith but does not represent or warrant its accuracy, adequacy, or completeness. In no event shall the Library be liable for any incorrect results or analysis; any direct, indirect, special, or consequential damages to any party; or any lost profits arising out of or in connection with the use or the inability to use the data or the services provided. The Library makes these data and services available as a convenience to the public, and for no other purpose. The Library reserves the right to change or revise published data and/or services at any time.
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| Distributor
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Montana State Library
PO Box 201800
Helena,
MT
59620-1800
Telephone:
406-444-5354
TDD/TTY:
Montana Relay 711
Fax:
406-444-0266
Email:
geoinfo@mt.gov
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| Distribution liability
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The Montana State Library Geographic Information Services provides this product/service for informational purposes only. The Library did not produce it for, nor is it suitable for legal, engineering, or surveying purposes. Consumers of this information should review or consult the primary data and information sources to ascertain the viability of the information for their purposes. The Library provides these data in good faith but does not represent or warrant its accuracy, adequacy, or completeness. In no event shall the Library be liable for any incorrect results or analysis; any direct, indirect, special, or consequential damages to any party; or any lost profits arising out of or in connection with the use or the inability to use the data or the services provided. The Library makes these data and services available as a convenience to the public, and for no other purpose. The Library reserves the right to change or revise published data and/or services at any time.
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