For more details about this dataset, please refer to this report:
Hamerlinck, J.D. and Arneson, C.S., editors, 1998, Wyoming Ground-Water Vulnerability Assessment Handbook: Volume 1. Background, Model Development, and Aquifer Sensitivity Analysis: Spatial Data and Visualization Center Publication SDVC 98-01-1, University of Wyoming, Laramie, WY.
Larry C. Munn and Christopher S. Arneson, 1998, Wyoming Estimated Net Annual Aquifer Recharge: University of Wyoming Spatial Data and Visualization Center, Laramie, Wyoming.Online Links:
This is a Raster data set. It contains the following raster data types:
The map projection used is Lambert Conformal Conic.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 1.0
Ordinates (y-coordinates) are specified to the nearest 1.0
Planar coordinates are specified in METERS
The horizontal datum used is North American Datum of 1983.
The ellipsoid used is GRS1980.
The semi-major axis of the ellipsoid used is 6378137.
The flattening of the ellipsoid used is 1/298.257.
Chris Arneson
Spatial Data and Visualization Center
Box 4008 University Station
Laramie, Wyoming 82071
USA
307-766-2735 (voice)
arneson@uwyo.edu
- Hours_of_Service: 8:00 - 5:00 MST
This layer was developed specifically to aid in the creation of a Wyoming ground-water vulnerability to surface contamination study conducted at the Wyoming Water Resources Center. The DRASTIC-based model requires surficial aquifer recharge as one of its parameters. This layer was specifically developed to aid in small-scale regional analysis within Wyoming and is not suitable for site specific analysis.
L.C. Munn and C.S. Arneson, 1998, Soils of Wyoming: A Digital ARC/INFO Map at 1:500,000-Scale <URL:http://www.sdvc.uwyo.edu/clearinghouse/metadata/soil500k.html> .
Chris Daly of PRISM Services, George Taylor of the Oregon Climate Se, 1997, Wyoming Average Annual Precipitation, 1961-1991, 2 km resolution <URL:http://www.sdvc.uwyo.edu/clearinghouse/metadata/prism.html>.
1. recharge fraction (R/P) or percent of precipitation that reaches the uppermost aquifer, for a given environment increases as the depth to the water table decreases.
2. recharge fraction increases as precipitation increases.
3. recharge fraction increases as the sand and rock content of the soil increases.
4. recharge fraction will be higher in an above average precipitation year and lower when precipitation is below average.
5. seasonal pattern and occurrence of major events such as spring snowmelt alter the general effect of mean annual precipitation.
In Soil Taxonomy (Soil Survey Staff, 1998), five moisture regimes are recognized in the soils of Wyoming. These are aquic, udic, ustic, xeric and aridic. The aquic regime has a high water table or a perched water table from an isolated surficial aquifer during at least part of the growing season. The udic regime is a leaching regime meaning precipitation exceeds evapotranspiration for a significant portion of the growing season. Soils with a udic regime commonly have a perched water table early in the spring following snowmelt. In the aridic regime evapotranspiration exceeds precipitation and soils are characterized by accumulations of secondary salts of varying solubility (CaCO3 , gypsum and more soluble salts). Recharge to the aquifer usually only occurs where the soils are very sandy (e.g. stabilized sand dunes) in soils along the banks of perennial streams with shallow water tables. The ustic and xeric moisture regimes are intermediate between aridic and udic regimes. The vegetation is primarily grassland, shrub land, or dry, open woodland. The ustic regime in Wyoming occurs typically where the precipitation varies between 30 cm and 45 cm/yr. The xeric regime is similar to the ustic regime except that precipitation is concentrated in the non-growing season. Soils in this regime can be as dry as aridic soils during the growing season but may be leached of salts by water accumulations in excess of the soils' winter water storage capacity.
Using these generalizations, recharge percentages were estimated based on soil type and applied to the 1:500,000-Scale Soils Map of Wyoming (Munn and Arneson, 1998). Using these percentage values and average annual precipitation calculated by the PRISM model, a value of precipitation in inches can be calculated. Calculations were done in ARC/INFO's GRID module at a 500 meter cell resolution.
Percentage Values used:
WY01 36 WY02 36 WY03 40 WY04 60 WY05 40 WY06 35 WY07 30 WY08 60 WY09 1 WY10 10 WY11 1 WY12 2 WY13 2 WY14 1 WY15 2 WY16 4 WY17 1 WY18 4 WY19 1 WY20 18 WY21 1 WY22 18 WY23 12 WY24 1 WY25 4 WY26 1 WY27 5 WY28 30 WY29 50 WY30 60 WY31 38 WY32 60 WY33 2 WY34 1 WY35 1 WY36 2 WY37 1 WY38 2 WY39 1 WY40 2 WY41 6 WY42 6 WY43 1 WY44 1 WY45 6Citations:
Knight, D.H. 1994. Mountains and Plains: the ecology of Wyoming landscapes. Yale University Press, New Haven.
Soil Survey Staff, 1998. Keys to Soil Taxonomy. Eighth edition. USDA-NRCS. US Government Printing Office, Wash. D.C. 326 pp.
Munn, L.C. and C.S. Arneson, 1998. Soils of Wyoming: A digital statewide map at 1:500,000-scale. Agricultural Experiment Station Report B-1069. University of Wyoming, College of Agriculture, Laramie, Wyoming.
see Process Steps
see Process Steps
All cells within the State of Wyoming are attributed.
does not apply for raster data
Are there legal restrictions on access or use of the data?
- Access_Constraints: none
- Use_Constraints:
- This data should not be used for analysis at a scale larger than 1:500,000. Because updates to this dataset or the attached metadata will occur without notice, this dataset may not be redistributed or repackaged in any form without the express written consent of the University of Wyoming Spatial Data and Visualization Center. Instead it is recommended that additional users download the most current version of the data from <http://www.sdvc.uwyo.edu/clearinghouse>.
SDVC Technical Coordinator
Spatial Data and Visualization Center
Box 4008 University Station
Laramie, Wyoming 82071
USA
307-766-2532 (voice)
n/a
The distributor shall not be held liable for improper or incorrect use of this data, based on the description of appropriate/inappropriate used described in this metadata document. The distributor makes no claims for the data's suitability for other purposes. It is strongly recommended that this data is directly acquired from the distributor described above and not indirectly through other sources which may have changed the data in some way.
| Data format: | ARCE (Arc/Info export) (version 7.0.4) |
|---|---|
| Network links: |
ftp.sdvc.uwyo.edu or <http://www.sdvc.uwyo.edu/clearinghouse> |
Margo Berendsen
Box 4008 University Station
Laramie, Wyoming 82071
USA
307-766-2751 (voice)
meh@uwyo.edu
