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:
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.