It turns out I was wrong about how the drainage plan is going to work. They did dig the big pit that is 4 feet by 12 feet, but they didn't put in a concrete box. I was envisioning something like a septic system, but the way it works is that they fill the pit with gravel. The gravel contains spaces to hold the water and to help the water seep slowly into the ground. The bobcat guy spent the day bringing gravel from the front of the house into the backyard to dump in the pit. From what I can tell, it takes a lot of gravel to fill a 4 x 12 pit.
The picture above shows the filled in pit. It is supposed to have some dirt on top, so I'm not sure why it is so full, but I will be keeping an eye on it. It is nice to know that thanks to the careful calculations of the engineers and the precise gravel-filling abilities of the concrete crew, we will have a fully drained yard! It is quite a comfort to me as I pay the bills.
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