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

     WGEW Soil Survey Report

     WGEW Soils Data

 

 

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

   
   

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


     Photos (Web Album)
  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
 
  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
 

 
   
  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