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#  DATASET_NAME: wyoming.txt	
#  DATASET_DESCRIPTION:	Text file describing the analysis process, sorted by state.
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#  REPORT TITLE: 
#     Estimated Withdrawals from Stream-Valley Aquifers and Refined 
#     Estimated Withdrawals from Selected Aquifers in the United 
#     States, 2000
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#  REPORT SERIES/NUMBER: Scientific Investigations Report 2008-5003 
#  REPORT URL: URL: http://pubs.er.usgs.gov/usgspubs/sir/sir20085003
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#  NAWQA STUDY:	Alluvial Aquifers
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#  METADATA DATE:   August 28, 2008 
#  METADATA CONTACT: Pierre Sargent, Molly Maupin, Stephen Hinkl
#                    U.S. Geological Survey
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#                    Baton Rouge, LA 70816
#	 	     
#                    voice: 225-298-5481 x 3211
#                    fax:   225-298-5490
#                    email: psargent@usgs.gov
#
#  SECONDARY CONTACT:  Molly Maupin
#                      U.S. Geological Survey
#                      230 Collins Road
#                      Boise, ID 83702
#
#                    	voice: 208-387-1307
#                    	fax:   208-387-1372
#                    	email: mamaupin@usgs.gov
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#  TERTIARY CONTACT:   Stephen Hinkle
#                      U.S. Geological Survey
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#                      Portland, OR 97201
#	
#                      voice: 503-251-3237
#                      fax:   503-251-3470
#                      email: srhinkle@usgs.gov
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#  ABSTRACT:  
#     The report authors maintained notes detailing the process that 
#     was used to do the analysis for this report. The pertinent 
#     notes were included in the appendix of the report. 
#     Some details that did not warrant publication reside 
#     in these notes. These notes are being archived in the 
#     event that they might be of use to future water-use 
#     efforts aimed at stream-valley aquifers.
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#  Basic documentation of dataset elements and history
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# Related_Spatial_and_Tabular_Data_Sets:  
#     There are related text files of notes for all 25 states/territories in this study
#     arizona.txt
#     arkansas.txt
#     colorado.txt
#     illinois.txt
#     indiana.txt
#     kansas.txt
#     kentucky.txt
#     louisiana.txt
#     missouri.txt
#     montana.txt
#     nebraska.txt
#     new_mexico.txt
#     new_york.txt
#     new_jersey.txt
#     north_dakota.txt
#     ohio.txt
#     oklahoma.txt
#     pennsylvania.txt
#     puerto_rico.txt
#     south_dakota.txt
#     tennessee.txt
#     texas.txt
#     utah.txt
#     west_virginia.txt
#     wyoming.txt
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#  METADATA Basic documentation of dataset elements:
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#     DATA DESCRIPTION: 
#         Text files describing the analysis process, one text file 
#         for each state
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#     DATA TYPES: ascii text
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#     DATA SOURCES: notes taken during data analysis and from correspondance
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WYOMING DOCUMENTATION 
Last edited: August 03, 2006

      The Wyoming Agricultural Statistics Service (WASS) and the Wyoming Water Development Commission provides information on the number of acres that are in irrigation and the crop type. Data on public supply water use was gathered by mailing out survey forms.  Public water systems that had at least 15 service connections or served at least 25 people for 60 days a year received the forms.  The Wyoming State Engineers Office provided geologic log information which was used to assigned aquifer units.  The United States Department of Labor, Bureau of Labor Statistics provided industrial information grouped by county.
      
      In 2000 total water ground-water withdrawals in Wyoming was approximately 541 Mgal/d.  Ground-water withdrawals in the categories of public supply, self-supplied industrial, and irrigation are 475 Mgal/d, 88 per cent of total ground-water withdrawals.  Total withdrawals of 67.1 Mgal/d were assigned to the alluvial aquifers category. The Other aquifer category totaled 3.3 Mgal/d, representing less than one per cent of ground water withdrawals from the three categories. For the alluvial aquifer category, the greatest withdrawals was assigned to irrigation (50.4 Mgal/d); followed by public supply (15.7 Mgal/d) and then self-supplied industrial (1.02 Mgal/d). Irrigation was also the source of most of the withdrawals attributed to the Other aquifer (2.42 Mgal/d).  Similarly public supply was the second major source of water assigned to the Other aquifer category (0.63 Mgal/d) and self-supplied industry was the third (0.25 Mgal/d).
      
      Stream-valley aquifer withdrawals were disaggregated by the USGS Wyoming Water Science in the following counties: Campbell, Crook, Niobara, and Weston which are located in the northeast part of the state. These counties are within the Great Plains Physiographic Province.  Much of Wyoming is within the high, rugged mountains of the Rocky Mountain Physiographic Division which is outside the area of this study.  Specific stream-valley aquifer withdrawals were determined by mapping wells, aquifer extent, streams, and geology.  Withdrawals assigned to the Other aquifer (3.30 Mgal/d) represent a compilation of small aquifer units that did not fit the criteria for classification as a principal aquifer.
      
      Alluvial Aquifers were the source of all withdrawals disaggregated into specific stream-valley aquifers.  Both the Belle Fourche and Sand Creek stream-valley aquifers are mapped and identified in the Ground Water Atlas of the United States. Neither the Niobrara River nor the unconsolidated sediments of the Niobrara stream-valley aquifer are shown in the Ground Water Atlas, but then the withdrawals attributed to this stream-valley aquifer (<6 Mgal/d) are consistent with the existence of a small stream-valley aquifer that could easily be overlooked in regional analysis.  
      
      Irrigation is the principal water use category for the three stream-valley aquifers.  The Niobrara stream-valley aquifer had the greatest irrigation withdrawals (5.77 Mgal/d); followed by the Sand Creek stream-valley aquifer (2.67 Mgal/d) and the Belle Fourche stream-valley aquifer (1.15 Mgal/d).  A small amount of self-supplied industrial withdrawals (0.01 Mgal/d) is attributed to the Sand Creek stream-valley aquifer.


