Reading software user’s guides is about as exciting as reading the latest IRS tax code changes, and this one may be no different. However, we attempt to enliven the presentation by continuing the getting-started PRAM-like example from Chapter 1. The example is an interesting environmental problem, and is suf•ciently compact that its input •les are readily presented. Before beginning the user’s guide, however, we embellish the PRAM-like example by formulating it in two other ways that are alternatives to the Chapter 1 Fd-based approach.