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SWRC Fit can fit several soil hydraulic models to measured soil water retention data. Copy your soil water retention data in the textbox below and press "Calculate" button. Before you use your original data you can see how it works by selecting a sample data from the pulldown menu. Read more instruction.

Description (NS: Not Specified)
Soil sample
Soil texture
Your name

Model selection
Brooks and Corey
van Genuchten
Fredlund and Xing [New!]

Figure option
Show only one model

Show more options

Soil Water Retention Curve

Calculation options

  • Fit θr θr =
  • Fit θs θs = θmax θs =
  • FX model: Use correction function
    with ψr = and ψmax =

Figure options

  • Figure size: Large Medium Small
  • Show grid
  • Type of x axis: Automatic Normal Logarithm
  • Range of x axis: to (0 for automatic)
  • Range of y axis: to (0 for automatic)
  • Font size =
  • Show label with for x axis
    and for y axis
  • Show legend with:
    • for measured
    • for BC model
    • for VG model
    • for LN model
    • for FX model
    • for DB model
    • for BL model
  • Measured plot: Marker size = and color =
  • Fitting curves: Line width = and color order =
    (blacK, Red, Blue, Green, Magenta and Cyan)

[New!] Now most of the options in the offline version are also available on this web version. Click "Show more options" to see all the options.


Please cite this paper when you publish your work using this program, SWRC Fit. Researches conducted with SWRC Fit.

BibTeX and EndNote files are also available.

Sample output

Unimodal model Bimodal model

Download / Document



Here you can find a list of questions and answers about SWRC Fit. You can submit your own question by getting the accout of GitHub (use the green "Sign up" button) and pressing the green "New Issue" button. Please select the label of "question". It is preferable to send your question publicly this way, because other people having the same question can find answer on the web. However, if your question is confidential, please contact me by email. You can find my email address in this paper.

Persistent URL of this page is http://purl.org/net/swrc/. (What is Persistent URL?)

Author: Katsutoshi Seki