Spring 2002
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GoldSim News
Featured GoldSim Application
Tips and Tricks
Model Library
Knowledge Base
What's Cooking

Welcome to the Spring 2002 issue of the GoldSim Newsletter! Published quarterly, our goal is to provide information that helps you get the most out of GoldSim. We also hope that the Newsletter can act as a vehicle to build connections between users within the GoldSim community.

Each newsletter delivers the latest GoldSim news, as well as a number of regular items. This includes a Featured GoldSim Application, tips from the GoldSim developers, a list of new models added to the GoldSim Model Library, a list of new GoldSim Knowledge Base articles, and a description of new features that the GoldSim Development Team is currently working on. Each Newsletter is archived on our website so you can revisit old issues.

Since this newsletter is for you, we encourage you to send us your comments and contributions. If you send us a contribution and we use it, we will acknowledge you in the Newsletter. Send your contributions to newsletter@goldsim.com.

The GoldSim Technology Group

First Release of GoldSim Pro

The GoldSim Technology group has released the first version of GoldSim Pro. For long-time users of GoldSim, it is important to know that GoldSim Pro is essentially the same program as GoldSim except that the contaminant transport features are now sold separately as the GoldSim CT and GoldSim RT modules. The GoldSim CT Module includes functionality for simulation of non-radioactive constituents while the GoldSim RT Module includes all the features of GoldSim CT plus additional features for simulation of radionuclides. Check out the products section of the website for a complete description of the new product line.


First International User Conference is a Success

The first GoldSim International User Conference was held April 24-26, 2002 in Seattle, Washington, and was highly successful. Attendees came from 15 countries (the United States, Canada, United Kingdom, Sweden, France, Germany, Spain, Hungary, South Africa, Japan, Taiwan, Australia, Peru, Brazil, and Chile), reflecting the geographic diversity of GoldSim's user base. The conference included 26 presentations, covering topics such as business dynamics, portfolio analysis, radioactive waste management, mining applications, and infrastructure modeling. In addition to meeting other GoldSim users from around the world, attendees learned about future directions for GoldSim and took advantage of the opportunity to provide feedback regarding features and capabilities they would like to see added to the software.


A Simple Water/Mass Balance of a Septage Disposal System in Western Colorado

Dave Hoekstra, P.E.
Golder Associates Inc.
Denver, Colorado USA

This quarter's featured application is an excellent example of the use of GoldSim for water and mass balance calculations for engineered systems. This particular model simulates the accumulation of solids and liquids in a series of settling and evaporation ponds designed to dry septage waste prior to disposal in a municipal solid waste landfill. Using stochastic climatic data, known physical properties and pond geometry, as well as forecast intake rates for the waste, the model determines the amount of materials entering the system and reports the fraction of the system's capacity that is required. The model is small enough to understand easily, while demonstrating several techniques for computing water balances in GoldSim.



Did you know that you can move the input and output ports (the red or green triangles between which the influence arrows are drawn) on an element? To do so, simply select the element, and press Ctrl+Sht+O to move the output port to different positions, or Ctrl+Sht+I to move the input port to different positions. On a related note, one of the features we plan to implement in the near future is an option for the influence arrows to be drawn from element center to element center, rather than between ports.



The GoldSim Model Library allows GoldSim users to build on the experience and knowledge of others by sharing models. The Library is available from within the GoldSim Resource Center (GRC).

Within the last several months, we have added a number of new models. Special thanks to Glen Fergus of the Brisbane, Australia office of Golder Associates. Glen contributed three excellent water balance building block models: a watershed yield (runoff) model, a storage element (reservoir) with a Puls-routed spillway (in which overflow is routed through the spillway according to its width and discharge coefficient), and a storage element (reservoir) with an unrouted spillway (in which the spillway behaves as if it is infinitely wide). The models are very well documented, and are quite impressive. If you are building water balance models, we strongly recommend that you check these out.

We have also added a wide variety of other models, including several financial applications (e.g., random walk investment model) and a queuing model. If you have a model that you think would be worthwhile to post to the library, please send it, along with text describing the model, to library@goldsim.com.


The GoldSim Knowledge Base contains articles addressing frequently asked questions, workarounds for known problems, and advice on applying GoldSim. The Knowledge Base is available from within the GoldSim Resource Center (GRC).

In the past several months, we have added articles addressing installation issues (e.g., installing parallel versions, transferring licenses between machines), file incompatibilities, and workarounds for several known problems.

We encourage you to visit the Knowledge Base, as even expert users are likely to find useful information there.


As most users are aware, we are constantly adding new features to GoldSim, based on feedback from our own modelers, as well as those of our clients, partners and customers.

In addition to the many minor improvements that we continuously make to the software, we are currently working on the following major enhancements:

  • On-line Help and Tutorials: On-line Help will essentially allow users to access almost all of the content in the user manual using the help menu within the software. This means you can find information without searching through either the online or printed version of the user manuals. The second addition will be an on-line tutorial that can be accessed from within the software. The material in the tutorial will be oriented towards the first time user and will hopefully make it easier to climb the GoldSim learning curve (or refresh your skills if you're an experienced user). We expect to release an interim release with both the On-line Help and Tutorial during the early part of Summer 2002.

  • Replication Module: This module will represent our first step toward integrating GoldSim with geographic information systems (GIS). Such a linkage would enable a user to combine the spatial modeling tools of a GIS with the dynamic modeling capabilities of GoldSim. In this first step, we will allow a user to define template models (sub-models in containers) that GoldSim automatically replicates across a user-specified grid. The template models will be defined such that the replicated containers will be able to communicate between grid cells (e.g., a model could reference an output from adjacent grid cells). We hope to release this module in the summer of 2002.

We received many excellent ideas from users during the user conference. We have recently sent out an email with a link to GoldSim Enhancement Survey that we hope will help us prioritize which enhancements to focus on. Click here if you haven't had an opportunity to fill out the survey and you want to make sure your voice is heard!


2002 Golder Associates Inc. If you wish to unsubscribe to this Newsletter, visit our website www.goldsim.com/enews. If this Newsletter was forwarded to you by someone else, and you wish to subscribe, you can also do so at www.goldsim.com/enews.