This author is reliable because this software is used by goverment agencies such as NASA, US departement of energy and the california departement of water resources. Research laborarories such as Los Alamos national laboratory and MIT. Commercial institutions suxh as amazon.com and Mitsubishi.
What this simulator does is that it represents the uncertainty inherent in enviornmenta systems in order to carry out enviormental risk assesment, formulte environmental management plans, evaluate potential environmental impacts, and make better environmental planning and resource management decisions.
It works by combining the flexibility of a general-purpose and highly-graphical probabilistic simulation framework with specialized modules to support mass transport modeling.