1. General Model Information

Name: Root Zone Water Quality Model

Acronym: RZWQM

Main medium: terrestrial
Main subject: biogeochemistry,hydrology
Organization level: ecosystem
Type of model: partial differential equations, ordinary differential equations
Main application:
Keywords: root zone, nutrient cycling, pesticde, plant growth


Laj Ahuja
USDA, ARS, Great Plains Systems Research Unit
P.O. Box E, 301 S. Howes
Fort Collins, Colorado 80522
Phone: (970) 490-8315
Fax: 970)490-8310
email: ahuja@gpsr.colostate.edu

Kenneth Rojas
Great Plains System Research Unit
PO Box Federal Building
Fort>Collins, CO 80522
Telephone: 303 490-8326
FAX : 303 490- 8310



The RZWQM (Root Zone Water Quality Model) is a process-oriented simulation model. The purpose of the model is to simulate water, chemical and biological processes in and on top of the root zone. The model also examines solute movement from the bottom of the root zone to the water table (DeCoursey et al., 1992). The model has been validated by comparing simulation results with observed values in experiments.

The model includes components for management practices, pesticide degradation dynamics, nutrient cycling and hydrologic dynamics. Data required for input include daily weather data, soil profile descriptions, soil chemistry, pesticides, plant growth, nutrients and management practices.

Also required is break-point rainfall information. The model is designed to examine daily and hourly time periods, and is a point model.

Author of the abstract:


II. Technical Information

II.1 Executables:

Operating System(s): DOS, UNIX and VAX

II.2 Source-code:

Programming Language(s): FORTRAN

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

DeCoursey, D., L. Ahuja, J. Hanson, M. Shaffer, R. Nash, C.Hebson and K. Rojas. 1992. Root Zone Water Quality Model: version 1.0: technical documentation.USDA-ARS, GPSR Technical Report No. 2., Great Plains Systems ResearchUnit, Ft. Collins, Colorado.

V. Further information in the World-Wide-Web

VI. Additional remarks

Last review of this document by: T. Gabele: Tue Oct 7 1997
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:48 CEST 2002

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