Why don't storm drains work?

This one creates a serious head-scratcher for me.

It’s been raining in Amarillo the past couple of days, with more steady rainfall expected through the weekend. The rain hasn’t exactly been in torrents, although it has rained harder in some locations than in others. Don’t get me wrong: I am among the many thousands of Texas Panhandle residents happy to see the moisture finally arrive.

However, what’s the story with the storm drains backing up?

I heard a city engineer say something today about “silt build-up” restricting the flow of rainwater into the storm drains. City officials were cautioning motorists to stay away from underpasses along Interstate 40 because of high water.

Good grief. We haven’t had any substantial rainfall since, oh, perhaps The Flood. At least it seems to have been that long. Where did the build-up of crud come from? Doesn’t the city monitor these drains to ensure that when the rain does arrive, that they’ll move the water efficiently to prevent large volumes of standing water that strands motorists — and puts them in jeopardy?

I saw social media pictures today of vehicles stalled out because of standing water. We have the usual suspect sites with which we have to contend. Fortunately, my wife and I have been able to avoid the trouble areas.

But they’re the same places that create havoc every time.

What in the world is up with that?