GEOGRAPHIC INFORMATION

Montana Average Annual Precipitation 1981-2010

Data Provider State of Montana Dept. of Environmental Quality
Date 1981 - 2010
Content Type Downloadable Data
Abstract An accurate estimate of average annual precipitation (AAP) is a necessity for completing hydrologic analysis, developing stream flow statistics, or doing other related water resource planning. Consequently, tools to develop and complete such analysis are required. Endeavors should be automated, capable of very quickly updating AAP information as it become available, and available for widespread use without proprietary requirements. To meet such a mandate, we developed a free-ware UNIX based tool called PMAP, which allows rapid AAP estimates through universal Kriging. A case study was implemented for the state of Montana using the 1981-2010 water-year averages and a 400 m elevation grid. While there are many geo-statistical techniques to choose from in completing such analysis, the strength in our work is not necessarily the method that we selected, but rather the data supporting it. We compiled AAP estimates for over 1,400 stations across the region including 1,100 stations in Montana, and 300 adjacent to the state, to assure compatibility along the border for the analysis which is the most detailed compilation we are aware of. We then proceeded to evaluate the data using a number of geostatistical analysis techniques. Electronic results were then compared to hand-drawn products to assure appropriate location of AAP isohyets. Isohyetal lines were set at 50 mm (2 inch) increments under 500 mm (20 inches) and 250 mm (10 inch) increments above 500 mm (20 inches). The1981-2010 AAP map (isohyets and grids) will be available through the Montana Natural Resource Information System (NRIS) web site electronically, and software will be made available from the Montana Department of Environmental Quality upon request.
Purpose Hydrologic analysis, developing stream flow statistics, or doing other related water resource planning using the average annual precipitation distribution from Water Years 1981-2010
Supplemental Information The 1981-2010 AAP map (isohyets and grids) is available from the Montana Natural Resource Information System (NRIS) and software is available from the Montana Department of Environmental Quality upon request (see contact information). Feature Classes within Geodatabase: 1. Basins: This feature class contains the complete HUC4 USGS hydrologic basins for Montana watershed. This includes the portions of HUCs (USA only) that extend outside Montana's state boundaries. 2. Canada_Basins: This feature class contains the Canadian hydrologic basins that border Montana. 3. Counties: This feature class contains the boundaries for Montana counties. 4. D3M8Cont: This feature class contains an accurate estimate of average annual precipitation (AAP) isohyets line contours that are necessary for completing hydrologic analysis, developing stream flow statistics, or doing other related water resource planning. This AAP (line) feature class was developed through universal Kriging using the 1981-2010 water-year averages and a 400 m elevation grid. AAP estimates were compiled for over 1,400 stations across the region including 1,100 stations in Montana, and 300 adjacent to the state, to assure compatibility along the border for the analysis: the most detailed compilation we are aware of. The data were then evaluated using a number of geostatistical analysis techniques. Electronic results were compared to hand-drawn products to assure appropriate location of AAP isohyets. Isohyetal lines were set at 50 mm (2 inch) increments under 500 mm (20 inches) and 250 mm (10 inch) increments above 500 mm (20 inches). 4. D3M8Grid: This feature class contains an accurate estimate of average annual precipitation (AAP) isohyets grids that are necessary for completing hydrologic analysis, developing stream flow statistics, or doing other related water resource planning. This AAP (grid) feature class was developed through universal Kriging using the 1981-2010 water-year averages and a 400 m elevation grid. AAP estimates were compiled for over 1,400 stations across the region including 1,100 stations in Montana, and 300 adjacent to the state, to assure compatibility along the border for the analysis: the most detailed compilation we are aware of. The data were then evaluated using a number of geostatistical analysis techniques. Electronic results were compared to hand-drawn products to assure appropriate location of AAP isohyets. Isohyetal grids were set at 50 mm (2 inch) increments under 500 mm (20 inches) and 250 mm (10 inch) increments above 500 mm (20 inches). 5. Montana: This feature class contains the state boundary for Montana. 6. Precipitation: This feature class contains the monitoring stations used for the precipitation distribution map.
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.
Data Access http://ftp.geoinfo.msl.mt.gov/Data/Spatial/NonMSDI/Geodatabases/mt_1981-2010_AveAnnPrecip.zip
Distributor Montana State Library
PO Box 201800
Helena, MT 59620-1800
Telephone: 406-444-5354
TDD/TTY: 406-444-4799
Fax: 406-444-0266
Email: geoinfo@mt.gov
Distribution liability 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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Metadata date 03/20/2014

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