1. General Model Information

Name: Versatile Soil Moisture Budget

Acronym: VB2000

Main medium: air+terrestrial
Main subject: agrometeorology, meteorology, agriculture, meteorology
Organization level: Ecosphere, Ecosystem
Type of model: individual based, not specified
Main application: research-development-monitoring, research, decision support/expert system, education
Keywords: soil moisture estimation,monitoring,crop-water use, monitoring, soil-plant-climate interactions


Dr. Johanne Boisvert
Program Director,
Eastern Region, SJC Building,
Ottawa, ONT, Canada, K1A 0C6

Phone: 1+ (613) 759 7834
Fax: 1+ (613) 759 7771
email: boisvertj@em.agr.ca


W. Baier, J. B. Boisvert and J. A. Dyer


The Versatile Soil Moisture Budget (VB 2000) Reference Manual - ECORC- July 2000
by W. Baier (Honorary Research Associate, Eastern Cereal and Oilseed Research Centre), J. B. Boisvert (Program Director, Eastern Region) and J. A. Dyer (Private Consultant)

Since its introduction in 1966, the Versatile Soil Moisture Budget (VB) has been widely used under variety of soil and climatic conditions in Canada and abroad. Based on these extensive applications and additional tests, several improvements were partially incorporated in earlier versions but these were not fully documented.
The present VB 2000 version was redesigned to include effective modifications and to make the computer program Year 2000 compliant.
Two major features were added: a dynamic root growth and a water table function, but the fundamentals that make the VB versatile and simple were kept.
The VB can be employed in dry and moist soils and under a variety of environmental conditions. It simulates variations in soil moisture distribution, drainage and actual evapotranspiration.
For a review of the VB concept and applications see:
Wolfgang Baier and Geo. W. Robertson, 1996. Soil moisture modelling - conception and evolution of the VSMB. Can. J. Soil Sci. 76: 251-261.
The current reference manual is divided into three parts:
Part A describes the fundamentals of the conceptual model;
Part B explains how to use the software;
and Part C deals with technical aspects relating to programming.
Copies of the manual and of the software are now available free of charge from the corresponding author:
Dr. Johanne Boisvert, Program Director, Eastern Region, Central Experimental Farm, Room 761 SJC Building, Ottawa, Ont., K1A 0C6, Canada.
Fax: (613) 759 7771,
e-mail: boisvertj@em.agr.ca.

II. Technical Information

II.1 Executables:

Operating System(s): Windows, IBM-PC compatible

II.2 Source-code:

Programming Language(s): Fortran

II.3 Manuals:

The Versatile Soil Moisture Budget (VB) Reference Manual

From the corresponding author: Dr. J. B. Boisvert

II.4 Data:

Standard climatological data (max. min. precipitation) basic soil characteristics, crop development data or estimates

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

V. Further information in the World-Wide-Web

VI. Additional remarks

Last review of this document by: Thu Sep 28 18:00:41 2000
Status of the document: Contributed by Dr. Wolfgang Baier
last modified by Tobias Gabele Wed Aug 21 21:44:51 CEST 2002

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