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 Instrumentation Map     Santa Rita Instrumentation Map

 
   
  SWRC Data Catalogue
   
  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 Coordinates
 

 

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.

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

     Flume Coordinates

     Flume Watershed Areas
 

 

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.

  Sediment
     Sediment data request
 

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 Data (in text files)
  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.
  Ecosystem Flux Data
Eddy covariance biosphere-atmosphere exchange

Walnut Gulch Sites:

Santa Rita Sites:

 

  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

Download GIS Layers

   
   

Web Map
Link to Walnut Gulch Web 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.

Sugg, Z (2013), Updating impervious surfaces Sierra Vista Report
 

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

  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
 
 

Overview document (.docx)

Rainfall simulation sites summary (.xlsx)

Rainfall simulations (.xlsx)

Ground and vegetation cover (.xlsx)

Rainfall simulation sites (.kmz)

Site photos (.zip)
Note: This is a 2.56GB file


  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
 
  The Data Access Project (355 kb PDF)

Data Use Agreement