Software - Virulo | Ground Water and Ecosystems Restoration Research

Virulo
Version 1.0 - August 2002

Description
System Requirements
Downloads: Installation and Start-Up
Technical Support

Virulo is a probabilistic screening model for predicting leaching of viruses in unsaturated soils. It employs Monte Carlo methods to generate ensemble simulations of virus attenuation due to physical, biological, and chemical factors. The model generates a probability of failure to achieve a user-chosen degree of attenuation. Virulo can be used based on limited information such as boring logs, climate data, and soil survey reports for a particular site of interest.

Virulo can be used to predict probability of leaching of viable viruses when the following assumptions can be used:

The soil layer of interest is homogeneous in texture
Water flow in the layer is due to gravity only
The pecolating water does not contain surface active agents
The soil layer does not induce preferential flow

The particulars of these assumptions are described in detail in the model documentation (see below).

Minimum System Requirements Back to Top

For a Windows installation, a Pentium-like grade processor is needed with at least 100 MHz speed and at least 32 MB RAM. If your system does not already have the Java Virtual Machine, version 1.2 or greater, you'll need about 35 MB hard disk space. If you already have the JVM, you'll need only about 2 MB for Virulo itself. Virulo has been tested with the following operating systems:

Windows 95, 98, NT Workstation 4.0, and 2000 Workstation
Apple Mac OS-X
Red Hat Linux 7.2
Solaris versions 7 and 8

It should work without problems as well on any other system that has a Java Virtual Machine (JVM) with Swing component capability.

Installation and Start-Up Back to Top

The Virulo model requires a computer system that has the Java Virtual Machine, version 1.2 or greater. If your system does not have the JVM, you may download one of the platform-specific installers for Virulo listed in the downloads section below. The installers will install a recent version of the JVM on your computer during the Virulo installation. If you later choose to uninstall Virulo, the JVM will be removed as well.

Getting Started:

Virulo documentation:

Theory and technical background (PDF). (43 pp, 3.8MB, About PDF)
Virulo User's guide (PDF). (27 pp, 1.2MB, About PDF)

Virulo installers:

Most users will want to use an installer. To do this, simply select the installation file from the list below that matches your operating system.

Installers for use if you don't already have a JVM:

Windows 95, 98, NT Workstation 4.0, and 2000 Workstation (11.2MB)
Linux (33.8MB)
Solaris (30.7MB)
HP Unix (50.5MB)

Installers for use if you already have a JVM:

Windows 95, 98, NT Workstation 4.0, and 2000 Workstation (1.3MB)
Linux (1.4MB)
Mac OS-X (1.1MB)
Solaris (1.4MB)
HP Unix (1.4MB)

If you are familiar with Java and you have the JVM, you may wish to run Virulo directly from its jar file. (91K)

Source code snapshot:

Formatted PDF (100 pp, 274K, About PDF) for reading.
Zipped ASCII text Java files.
Zipped Class Documentation.

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