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Improvements to Measuring Water Flux in the Vadose Zone

^a Department of Soil Science, University of Wisconsin, 1525 Observatory Drive, Madison, WI 53706
^b Department of Crop, Soil, and Environmental Sciences, University of Arkansas, 115 Plant Sciences Building, Fayetteville, AR 72701
^c USDA-ARS, Department of Soil, Water, and Climate, University of Minnesota, 1991 Upper Buford Circle, St. Paul, MN 55108

View larger version (47K): [in a new window]   Fig. 1. Schematic diagram of an automated equilibrium tension lysimeter (AETL) system.

View larger version (24K): [in a new window]   Fig. 2. Hourly response of the automated equilibrium tension lysimeter (AETL) system to changes in soil-water matric potential of the bulk soil (BS), above the lysimeter (AL), and of the lysimeter suction (LS).

View larger version (40K): [in a new window]   Fig. 3. Natural variation of the bulk soil suction (kPa) along with daily precipitation (mm) and leachate volumes collected (mm) at each sample date. The stars represent precipitation events that resulted in sudden increases of soil-water matric potential.

View larger version (26K): [in a new window]   Fig. 4. Hourly measurement of soil-water matric potential and cumulative precipitation (PPT) following the rainfall event on 24 Sept. 2001.

View larger version (28K): [in a new window]   Fig. 5. Water level versus ECH2O probe output. The ECH2O probe was measured by a datalogger after each increment of water was added and water level was confirmed with manual measurement.