About Us | Help Videos | Contact Us | Subscriptions

Members of ASA, CSSA, and SSSA: Due to system upgrades, your subscriptions in the digital library will be unavailable from May 15th to May 22nd. We apologize for any inconvenience this may cause, and thank you for your patience. If you have any questions, please call our membership department at 608-273-8080.


Institutional Subscribers: Institutional subscription access will not be interrupted for existing subscribers who have access via IP authentication, though new subscriptions or changes will not be available during the upgrade period. For questions, please email us at: queries@dl.sciencesocieties.org or call Danielle Lynch: 608-268-4976.



This article in SSSAJ

  1. Vol. 71 No. 3, p. 669-673
    Received: Dec 13, 2005

    * Corresponding author(s): rrwells@ars.usda.gov
Request Permissions


A Simple Technique for Measuring Wetting Front Depths for Selected Soils

  1. R. R. Wells *a,
  2. M. J. M. Römkensa,
  3. J.-Y. Parlangeb,
  4. David A. DiCarloc,
  5. T. S. Steenhuisd and
  6. S. N. Prasade
  1. a USDA-ARS National Sedimentation Lab., 598 McElroy Dr., Oxford, MS 38655
    b Biological and Environmental Engineering, Cornell Univ., Ithaca, NY 14853
    c USDA-ARS National Sedimentation Lab., 598 McElroy Dr., Oxford, MS 38655
    d Biological and Environmental Engineering, Cornell Univ., Ithaca, NY 14853
    e Dep. of Civil Engineering, Univ. of Mississippi, Oxford, MS 38677


The depth of the wetting front within a soil sample in infiltration measurements, especially in soils that develop cracks on drying, is difficult to ascertain simply and nondestructively. A technique was developed to determine wetting front locations on prepared soil beds, with a miniature penetrometer probe of the needle type, immediately following a simulated rainfall event. The method involves placing a 0.5-kg weight atop a miniature penetrometer probe and measuring the penetration depth of the probe relative to a known datum. Five texturally different soils were tested under similar laboratory conditions to evaluate this method. The penetrometer-based method provided accurate estimates of the wetting front position in laboratory simulated rainfall infiltration studies for clay, silty clay, and sandy clay soils that differed from visually observed depths by <1 mm. For the silt loam soils, however, this method underestimated mean wetting front depths by as much as 4 mm, with a standard deviation of 1.6 mm and 95% confidence limits of ±2.5 mm. The penetrometer method was especially useful for detailed characterization of wetting front depths in soils where wetting was highly variable or irregular (e.g., cracking clay soils).

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © 2007. Soil Science SocietySoil Science Society of America