GGSD Program Details for PLASM

PLASM

Category	Groundwater flow (2D)
Platform	DOS
Status	Commercial
Description	PLASM as distributed by the IGWMC is a programs package based on the Prickett Lonnquist Aquifer Simulation Program (PLASM) first published in 1971 by the Illinois State Water Survey. It consists of three finite-difference simulation programs and a pre-processor. The programs simulate 2D nonsteady flow of ground-water in heterogeneous anisotropic aquifers under water table, nonleaky, and leaky confined conditions. Included are options for time-varying pumpage from wells, induced infiltration from streams or shallow aquifers, and watertable depth dependent evapotranspiration. The finite-difference equations are solved using a modified alternating direction method. The versions included in this package are: PLASM85, simulation of transient flow in a fully confined aquifer; CONPLASM, simulation of transient flow in a fully confined or leaky confined aquifer; and UNCPLASM, simulation of transient flow in an unconfined (or water-table) aquifer. Grid of 70 * 70 nodes. Pre-processor PREPLASM for CONPLASM and UNCPLASM. Output an x,y,h file for postprocessing with a commercial contouring package, and a h,t file for selected nodes for line-graph postprocessing with commercial software.
Cost	US Dollars 150
Data formats supported	None stated
Supplier in United States of America	International Ground Water Modeling Center