Lakes Environmental Software

- Emergency Release Dense Gas Model



SLAB View is a graphical user interface for the SLAB model - an atmospheric dispersion model for denser-than-air releases. SLAB View is an ideal tool to predict hazardous zones and potential impacts of accidental releases.


SLAB View is able to show you how the release develops over time, as well as what the total footprint of the release will be.

SLAB View can model continuous, finite duration, and instantaneous releases from four types of sources:

  • a ground-level evaporating pool
  • an elevated horizontal jet
  • a stack or elevated vertical jet
  • and a ground-based instantaneous release

The SLAB model was developed in the 1980s by Lawrence Livermore National Laboratory (LLNL), with financial support from the Department of Energy (DOE). The SLAB model is currently distributed and supported by the US EPA.

Main Features

Integrated Graphical User Interface

Fully integrated interface combining easy to use graphical tools, seamless model run, and automated contouring and posting of results.

Maximum Concentration Graphs

Maximum Concentration Graphs

SLAB View automatically generates graphs displaying the Maximum Concentration Along the Centerline for all the meteorological conditions being modeled. You can specify the Level of Concern (LOC) for the chemical being modeled to be shown in the graph (indicated in this image as a red line).

3D Visualization

Watch the plume disperse in three dimensions using the 3D View option. Understanding how a release spreads has never been easier. SLAB 3D allows you to create animations of plume migration that can be incorporated into most presentation packages.

Export to Google Earth

Export to Google Earth

This exciting feature allows you to export the footprint and or puff of the source spill into Google Earth giving you a more realistic image of where the spill will impact surrounding areas. learn more


Graphical and Output Options

SLAB View provides you with full control of the appearance of your footprints and puffs. You can specify the footprint levels (ppm) to be displayed, which colors to use, line thickness, and much more.


Extensive Chemical Database

SLAB View has an extensive database of chemicals that can be modeled, including their properties. User defined chemicals can also be added.


Support for Several Base Map Formats

SLAB View has support for a variety of image and base map formats allowing you to setup your model with confidence and easy visualization and identification of the location of your spill area. Supported base maps include: Bitmap, DLG, DXF, JPEG, LULC, MrSID, Shapefile, and TIFF/GeoTIFF.

Multiple Release Types

Multiple Release Types

SLAB View models several different release types such as horizontal and vertical jet, evaporation pool, and instantaneous or short duration evaporation pool.

SLAB View is an interface for the SLAB model. See below the technical specifications for this model:

  • Model Name: SLAB - An Atmospheric Dispersion Model for Denser-Than-Air Releases
  • Model Guide: SLAB Model User's Guide
  • Developed By: Dr. Donald L. Ermak, Lawrence Livermore National Laboratory (LLNL)
  • Model Type: Steady-state Gaussian Plume model
  • Time Step: Seconds
  • Range: Near Field
  • Terrain: Not modeled
  • Building Downwash: Not modeled
  • Source Types: Evaporating pool, horizontal jet, vertical jet or stack, instantaneous or short duration evaporating pool
  • Input Meteorology: User defined meteorological conditions
  • Wind Field: Homogeneous
  • Release Types: Denser than air plumes
  • Emission Types: Emergency release, continuous and transient emissions
  • Atmospheric Chemistry: Not modeled
  • Output: SLAB produces outputs of chemical concentrations at
  • various positions downwind and at specified heights above the ground
  • Regulatory Status: US EPA Alternative Model

This product is a Microsoft Windows-based program that can be installed in the following Windows operating systems:

  • 32-bit and 64-bit Operating Systems
  • Windows 10
  • Windows 8 & 8.1
  • Windows 7 (Home Premium, Professional, and Ultimate Versions)

Minimum requirements:

  • An Intel Pentium 4 processor (or equivalent) or higher
  • At least 2 GB of available hard disk space
  • 1 GB of RAM (2 GB recommended)

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