Damn big tank
I know some of you are really broken up about the dearth of construction photos lately, so here's a progress post.
A detention tank is where the storm water goes before being dumped into the storm drain system. It regulates the flow of water so that if we have a big storm, the system doesn't get overloaded with water.
The picture above shows them covering over the building's detention tank with gravel. The gravel is a slightly different color than the dirt, so you can see the extent of the tank. I'll see if I can find the volumetric size, but the description in the documents says 2 tanks, 66" diameter, 78 linear feet each.
You can get a feel for the scale of the project by the munchkins working on the job.