1. General Model Information

Name: Prickett Lonnquist Aquifer Simulation Model

Acronym: PLASM

Main medium: terrestrial
Main subject: hydrology
Organization level: ecosystem
Type of model: partial differential equations (finite differences,3D)
Main application:
Keywords: groundwater flow, saturated, continuity equation, finite difference numerics, IADI method


T.A. Prickett and Associates Inc.
6 G.H. Baker Drive
Urbana, IL. 61801
orEnviromental Systems and Technologies, Inc.
2608 Sheffield Drive
Blacksburg, VA 24060-8270Phone:
Fax :


Prickett, T.A., and C.G. Lonnquist


PLASM (Prickett Lonnquist Aquifer Simulation Model) is a finite difference model for simulation of transient, two-dimensional or quasi-three-dimensional flow in a single or multi-layered, heterogeneous, anisotropic aquifer system. The original model of 1971 consisted of a series of separate programs for various combinations of simulation options. Later versions combined most of the options in a single code, including variable pumping rates, leaky confined aquifer conditions, induced infiltration from a shallow aquifer or a stream, storage coefficient conversion between confined and water table conditions, and evapotranspiration as a function of depth to water table. The model uses the iterative alternating implicit method (IADI) to solve the matrix equation. The IGWMC has developed a preprocessor for PLASM.

II. Technical Information

II.1 Executables:

Operating System(s): DOS The IGWMC distributes a version with preprocessor.

II.2 Source-code:

Programming Language(s):

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

V. Further information in the World-Wide-Web

VI. Additional remarks

Last review of this document by: T. Gabele: 08. 07. 1997 -
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:47 CEST 2002

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