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The SWRC operates the Walnut Gulch Experimental Watershed in southeastern Arizona as an outdoor laboratory for studying semiarid rangeland hydrologic, ecosystem, climate, and erosion processes.

An overview of SWRC and WGEW research is provided in a downloadable brochure:   SWRC Brochure 

WGEW Data Use Agreement

 

SWRC Data Catalogue

Instrumentation Dashboard with Locations and Metadata for WGEW and SRER Instrumentation

 
 

Core Monitoring Networks


 

Dataset Documentation


  Precipitation (Form based data request)
  Analog (through 1999) Digital (2000 - current)
  Aggregate data Aggregate data
  Event data Event data

     Rain gage (precipitation) charts available here
 

 

Goodrich, D. C., T. O. Keefer, C. L. Unkrich, M. H. Nichols, H. B. Osborn, J. J. Stone, and J. R. Smith (2008), Long-term precipitation database, Walnut Gulch Experimental Watershed, Arizona, United States, Water Resour. Res., 44, W05S04, doi:10.1029/2006WR005782.

Supporting documentation: From rain gauge to database for precipitation

  Runoff(Form based data request
  Analog (through 1999) Digital (2000 - current)
  Aggregate data Aggregate data
  Event data Event data

     Flume (runoff) charts available here

 

Stone, J. J., M. H. Nichols, D. C. Goodrich, and J. Buono (2008), Long-term runoff database, Walnut Gulch Experimental Watershed, Arizona, United States, Water Resour. Res., 44, W05S05, doi:10.1029/2006WR005733.

Supporting documentation: From flume to database for runoff

  Sediment
     Sediment data request
 

Polyakov, V. O., M. A. Nearing, M. H. Nichols, R. L. Scott, J. J. Stone, and M. P. McClaran (2010), Long‐term runoff and sediment yields from small semiarid watersheds in southern Arizona, Water Resour. Res., 46, W09512, doi:10.1029/2009WR009001.

Nichols, M. H., J. J. Stone, and M. A. Nearing (2008), Sediment database, Walnut Gulch Experimental Watershed, Arizona, United States, Water Resour. Res., 44, W05S06, doi:10.1029/2006WR005682.

Nearing, M.A., Nichols, M.H., Stone, J.J., Renard, K.G., Simanton, J.R. 2007. Sediment yields from unit-source semi-arid watersheds at Walnut Gulch. Water Resources Research, Vol.43, W06426, doi:10.1029/2006WR005692

  Meteorologic and Soil Moisture
     Meteorological and Soils Data (in text files)

Soils Moisture data for WGEW and SRER is also available from Ameriflux:
Walnut Gulch Sites:

Santa Rita Sites:

 

Keefer, T. O., M. S. Moran, and G. B. Paige (2008), Long-term meteorological and soil hydrology database, Walnut Gulch Experimental Watershed, Arizona, United States, Water Resour. Res., 44, W05S07, doi:10.1029/2006WR005702.

Supporting documentation: From meteorology station to database for meteorology

Supporting documentation: From soil probe to database for soil moisture

  Ecosystem Flux and Associated Meteorological Data
Eddy covariance measurements of energy, water vapor, and carbon dioxide fluxes between the biosphere and atmosphere

Walnut Gulch Sites:

Santa Rita Sites:

San Pedro Riparian Ecosystems:

 

 

Scott, R.L., Biederman, J.A., Hamerlynck, E.P., Barron-Gafford, G. 2015. The carbon balance pivot point of southwestern U.S. semiarid ecosystems: Insights from the 21st century drought. Journal of Geophysical Research-Biogeosciences. 120:2612-2624.

 

GIS Data Layers


For more information, e-mail:
    ars-pwa-tucson-swrc-gis@ars.usda.gov

GIS Layers on ArcGIS Online
WGEW Layers
SRER Layers

Download GIS Layers

   

   

WGEW and SRER Web Map
Link to Walnut Gulch Web Map

SRER Check Dams Story Map
Link to SRER Check Dams Map

 

Heilman, P., M. H. Nichols, D. C. Goodrich, S. Miller, and P. Guertin (2008), Geographic information systems database, Walnut Gulch Experimental Watershed, Arizona, United States, Water Resour. Res., doi:10.1029/2006WR005777.

 

Soil Erodibility
     Download Excel spreadsheet

 

Rhoton, F.E., W.E. Emmerich, D.C. Goodrich, S.N. Miller and D.S. McChesney, Long-term soil erodibility database, WGEW, Arizona, USA

   
 

Vegetation
     Map based data

     Report on flora (herbarium) of the WGEW

 

Skirvin, S., M. Kidwell, S. Biedenbender, J. P. Henley, D. M. King, C. D. H. Collins, M. S. Moran, and M. A. Weltz  (2008),  Vegetation data, Walnut Gulch Experimental Watershed, Arizona, United States,  Water Resour. Res.,  doi:10.1029/2006WR005724.

 

Legacy Bowen Ratio Flux Data
    Lucky Hills Site (47MB zip file w/Excel spreadsheet)
    Kendall Site (47MB zip file w/Excel spreadsheet)
    Metadata (24KB zip file w/PDFs)
 

 

Emmerich, W. E., and C. L. Verdugo (2008), Long-term carbon dioxide and water flux database, Walnut Gulch Experimental Watershed, Arizona, United States, Water Resour. Res., 44, W05S09, doi:10.1029/2006WR005693.

 

Ecological Sites
     Ecological Sites Map

 

Heilman, P., Stone, J. J., and Robinett D. Ecological Sites of The Walnut Gulch Experimental Watershed

 

Geology
     Map based data
 

 

Osterkamp, W. R. 2008. Geology, soils, and geomorphology of the Walnut Gulch Experimental Watershed, Tombstone, Arizona. Journal of the Arizona-Nevada Academy of Science 40(2):136-154.

 

Soils
     SSURGO Map
     STATSGO Map
     1993 Soil Survey Map


     WGEW Soil Survey Report
     WGEW Soils Data

 

Osterkamp, W. R., D. Breckenfeld, and J. J. Stone, Soils, WGEW, Arizona, USA

 

Geomorphology
     Map based data
 

 

Osterkamp, W. R. 2008. Geology, soils, and geomorphology of the Walnut Gulch Experimental Watershed, Tombstone, Arizona. Journal of the Arizona-Nevada Academy of Science 40(2):136-154.

 

Ownership
    Map based data

Hydrography
NHD Streamlines Map (Med. resolution)
High Resolution Streamlines Map
 

 
   
 

Rainfall Simulator Data


 
 

Data Dictionary
Rainfall simulation sites summary
Rainfall simulations
Ground and vegetation cover
Rainfall simulation sites
Site photos


 

Publication Citation: Polyakov, V., Stone, J., Holifield Collins, C., Nearing, M. A., Paige, G., Buono, J., and Gomez-Pond, R.-L.: Rainfall simulation experiments in the southwestern USA using the Walnut Gulch Rainfall Simulator, Earth Syst. Sci. Data, 10, 19-26, https://doi.org/10.5194/essd-10-19-2018, 2018.

Dataset Citation: Stone, Jeffry; Polyakov, Viktor; Holifield-Collins, Chandra; Paige, Ginger; Buono, Jared ; Nearing, Mark; Gomez-Pond, Rae-Landa (2017). Rainfall simulation experiments in the Southwestern USA using the Walnut Gulch Rainfall Simulator. Ag Data Commons. http://dx.doi.org/10.15482/USDA.ADC/1358583

 

Other Data


 
  Remote Sensing
    
 

Moran, S., C. D. H. Collins, D. C. Goodrich, J. Qi, D. T. Shannon, and A. Olsson  (2008),  Long-term remote sensing database, Walnut Gulch Experimental Watershed, Arizona, United States,  Water Resour. Res.,  doi:10.1029/2006WR005689.

   
 

Additional Information


 
  Dissertations using WGEW data
Master’s Theses using WGEW data

The Data Access Project (355 kb PDF)

WGEW Data Use Agreement