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HSSM, or Hydrocarbon Spill Screening Model, simulates flow of the light nonaqueous-phase liquid (LNAPL) transport of a chemical constituent of the LNAPL from the surface to the water table, radial spreading of the LNAPL at the water table, and dissolution and aquifer transport of the chemical constituent. The HSSM model is one-dimensional in the vadose zone, radial in the capillary fringe, and two-dimensional in the vertically averaged analytical solution of the advection dispersion equation in the saturated zone. The model is based on the KOPT, OILENS and TSGPLUME models.


Version 1.1
Release Date April 1994
Development Status general release
Development Information  
Operating System  
Development Language DOS
Intended Audience  
Key Words  
Related Web Sites  


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HSSM of DOS installation files (ZIP) (831 KB)

US EPA. (1995) "The Hydrocarbon Spill Screening Model (HSSM), Volume 1: User’s Guide." Publication No. EPA/600/R-94/039a.

S EPA. (1995) "The Hydrocarbon Spill Screening Model (HSSM), Volume 2: Theoretical Background and Source Codes." Publication No. EPA/600/R-94/039b.

HSSM Volume II – Parameter Variation Data Sets (ZIP) (44 KB)

"HSSM Readme File for the Hydrocarbon Spill Screening Model (HSSM), Version 1.10, March 1, 1995, Revised April 2, 1996." (PDF) (8 pp, 32 KB)

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