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This article in JEQ

  1. Vol. 30 No. 5, p. 1756-1770
    Received: Sept 8, 2000

    * Corresponding author(s): ostendorf@ecs.umass.edu


Chloride Persistence in a Deiced Access Road Drainage System

  1. David W. Ostendorf *a,
  2. David C. Peelinga,
  3. Travis J. Mitchella and
  4. Samuel J. Pollockb
  1. a Civil and Environmental Engineering Department, University of Massachusetts, Amherst, MA 01003
    b Research and Materials Section, Massachusetts Highway Department, South Boston, MA 02210


Three years of field data, classical linear reservoir theory, and a new dissolution model confirm the hypothesis that residual chloride from highway deicing applications dissolves into precipitation throughout the year. The measured input includes 52 storm hyetographs and logs of salt and premix applications on an access road with a closed drainage system subject to runoff, interflow, and baseflow. The output data feature discharge and conductivity in an outlet weir measured continuously from February 1998 to May 2000. Individual storm hydrographs and pollutographs yield calibrated first flush dissolved chloride concentrations and residual solid chloride loads that persist at appreciable levels over the entire period of record. The storm calibrations imply a source strength ω of 2.01 × 10−6 s−1 that accurately models chloride dissolution kinetics through three salt seasons on the access road. This ω rests on physically plausible values for the depression storage depth ζ (3 mm) and porosity n (0.40) that store the residual chloride.

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Copyright © 2001. American Society of Agronomy, Crop Science Society of America, Soil Science SocietyPublished in J. Environ. Qual.30:1756–1770.