Soil moisture - TDR (HydroSense)

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Parameter to be measured:

Soil moisture


TDR-method, display gives estimation of travle time in ms and water content after Topps (1980) equation


  • CAMPBELL: Two rod sensor CS620 with length of 120 mm and 200 mm and CD620 Hydrosense Display


  • easy and fast measurement of punctual soil moisture
  • manual measurements


  • Fractional digits of reflection time in ms: only one
  • Careful application of probe in stony soils
  • Accuracy: ±3% water content

What to watch out for:

  • Good contact between probe and medium has to be proved



  • 1100 € for probe, rods and reading device (1100)


Other related web sites:


Petrone, RM Price, JS, Carey, SK, Waddington, JM 2004. Statistical characterization of the spatial variability of soil moisture in a cutover peatland. HYDROL PROCESS 18(1), 41-52.

Topp, GC, Davis, JL, Annan, AP, 1980. Electromagnetic Determination of Soil Water Content: Measurements in Coaxial Transmission Lines. WATER RESOURCES RESEARCH, 16(3), 574-582.

Wright, N, Quinton, WL, Hayashi, M 2008. Hillslope runoff from an ice-cored peat plateau in a discontinuous permafrost basin, Northwest Territories, Canada. HYDROL PROCESS 22(15), 2816-2828

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