There really isn't much point to this post except that I spend some time last week trying to find cool ways to make exhibits to convey messages about how steep something is, or how much earth had to be moved.
A different visual wound up being chosen for the project, but I spent some time working through a few things, and I thought you might get some ideas that you could use in your work.
Each of these images tells a story- what story are you trying to tell? How can you best show that?
Keep in mind that a lot of the time your audience (such as clients, zoning hearings, public workshops, management) care less about what is a meaningful exhibit from an engineering perspective, and care more about understanding the site. Try to put yourself in their shoes. Good practice audiences include: your mom, or even better your grandmom or your six year old. You need to find people who aren't totally immersed in our world to give you feedback.