1. General Model Information
Name: Model for Unsaturated flow above a Shallow water-Table
Main medium: terrestrial
Main subject: hydrology
Organization level: ecosystem
Type of model: compartment model
Keywords: soil, unsaturated flow, shallow water-table, evapotranspiration, water-table depth, drain outflows, matrix pressure, pseudo steady-state approach
Dr.ir. P.J.M. de Laat
Infrastructure Hydraulics Environment, Hydraulic and Hydrologie Engineering
2601 DA Delft
Fax : +31.15.122921
MUST is a Model for Unsaturated flow above a Shallow water-Table. The solution
technique for vertical transport of soil moisture is based on a pseudo
steady-state approach. The soil profile is schematized into a root zone and a
subsoil. Transient flow in the subsoil is simulated by a succession of
steady-state situations. The solution is obtained by combining the steady flow
situations with the water balance for the root zone and the subsoil for given
boundary flux conditions. The upper boundary flux is found from the given rate
of rainfall and potential evapotranspiration, or may be computed by the
evaporation module for standard meteorological data. The lower boundary flux
may be found from a given water-table elevation, a relation between a flux and
the water-table elevation, or a module that describes the drainage system.
Author of the abstract:
CAMASE Register of Agro-ecosystems Models
II. Technical Information
Operating System(s): IBM compatible PC (AT or more)
Programming Language(s): FORTRAN-77
III. Mathematical Information
Laat, P.J.M. de, 1980.
Model for unsaturated flow above a shallow water-table.
Agric. Res. Rep. 895, Pudoc, Wageningen.
Design and operation of a subsurface irrigation scheme with MUST.
ICID, workshop on crop-water models (in print).
V. Further information in the World-Wide-Web
VI. Additional remarks
Last review of this document by: T. Gabele: 07.07. 1997 -
Status of the document:
last modified by
Joachim Benz Mon Jul 2 18:31:37 CEST 2007