I wonder if this happens often or if there is a recent drainage problem.

I was wondering the same thing. I don't recall any recent construction in that area. In fact, it has been built out for decades. Drainage there is pretty much entirely artificial, so the storm probably just outperformed the engineering standards. That area is the headwaters of an insignificant stream that runs along Cusick Rd, so all that water came from the sky, not from upstream.
Microbursts can create local conditions wildly out of variance with weather norms. I'd guess a lucky couple of acres in Alcoa just got a 500-yr storm.