Long‐term runoff database, Walnut Gulch Experimental Watershed, Arizona, United States

[1] Runoff measurement at the semiarid Walnut Gulch Experimental Watershed began in the middle 1950s with five critical depth flumes. Since that time, the measurement network has evolved to include measurement structures on 11 large watersheds (2.27–149 km2), 8 medium watersheds (0.35–1.60 km2), and 11 small watersheds (0.0018–0.59 km2). The ephemeral nature of runoff, high-flow velocities, and high-sediment concentrations in the flow led to the development of the Walnut Gulch supercritical flume used on the large watersheds and the Smith supercritical flume used on the small watersheds. The period of record considered good to excellent ranges from 26 to 47 years. In 1999, the original analog recording systems were augmented with digital recorders. Runoff occurs at Walnut Gulch primarily as a result of convective thunderstorms during the months of July through September. Runoff volume and flow duration are correlated with drainage area as a result of the limited areal extent of runoff producing rainfall and transmission losses or infiltration of the flood wave into the channel alluvium. Runoff records including hydrographs and summary data are available in several formats via a Web interface at http://www.tucson.ars.ag.gov/dap/.

[1]  Kenneth G. Renard,et al.  A brief background on the U.S. Department of Agriculture Agricultural Research Service Walnut Gulch Experimental Watershed , 2008 .

[2]  K. Renard,et al.  Transmission Losses in Ephemeral Stream Beds , 1962 .

[3]  Joshua R. Smith,et al.  Long‐term precipitation database, Walnut Gulch Experimental Watershed, Arizona, United States , 2008 .

[4]  D. Goodrich,et al.  Linearity of basin response as a function of scale in a semiarid watershed , 1997 .

[5]  D. Kincaid,et al.  Use of unit‐source watersheds for hydrologic investigations in the semiarid Southwest , 1966 .

[6]  H. N. Holtan.  Field manual for research in agricultural hydrology , 1962 .

[7]  Mary H. Nichols,et al.  Geographic information systems database, Walnut Gulch Experimental Watershed, Arizona, United States , 2008 .

[8]  L. Lane,et al.  Precipitation-runoff relations for very small semiarid rangeland watersheds , 1969 .

[9]  David C. Goodrich,et al.  Geometric simplification of a distributed rainfall-runoff model over a range of basin scales. , 1990 .

[10]  V. Lopes,et al.  EFFECTS OF WATERSHED REPRESENTATION ON RUNOFF AND SEDIMENT YIELD MODELING 1 , 2004 .

[11]  Vegetation data, Walnut Gulch Experimental Watershed, Arizona, United States , 2008 .

[12]  Kenneth G. Renard,et al.  Runoff Curve Number Variation with Drainage Area, Walnut Gulch, Arizona , 1996 .

[13]  Emmett M. Laursen,et al.  Thunderstorm runoff in southeastern Arizona. , 1973 .

[14]  L. Lane.  Distributed Model for Small Semiarid Watersheds , 1982 .

[15]  D. Goodrich,et al.  The impact of parameter lumping and geometric simplification in modelling runoff and erosion in the shrublands of southeast Arizona , 2006 .

[16]  M. Nichols.  Measured Sediment Yield Rates From Semiarid Rangeland Watersheds , 2006 .

[17]  J. R. Wight,et al.  SPUR: simulation of production and utilization of rangelands: a rangeland model for management and research , 1983 .

[18]  Soroosh Sorooshian,et al.  Spatial characteristics of thunderstorm rainfall fields and their relation to runoff , 2003 .

[19]  W. R. Gwinn,et al.  Supercritical Flow Flumes for Measuring Sediment-Laden Flow , 1982 .