Is this sentence correct?

[Thunderpunt]

Dubai Airport said it was facing "very challenging conditions" on Wednesday. It advised passengers not to turn up as runways were inundated with water.

Just sitting in a restaurant waiting for some food to arrive and was reading the news headlines.

Does the second sentence in the passage above make sense?

You can't just say 'inundated', you have to qualify it, otherwise people can only make a guess.

Having said that, I assume that most people reading the message would already be well aware of the problem.

Yes. But not the only one. So it helps to clarify they aren’t shut because they are inundated with something else.

Yes. But not the only one. So it helps to clarify they aren’t shut because they are inundated with something else.

Not how language works, but if you want to see it dumbed down, fair enough.

It should say the runways are flooded x

It’s exactly how language works. It’s not dumbing down to clarify. One meaning of inundated is flooded (with water) a further meaning is overwhelmed by something else - diverted planes or passengers for eg.
English teacher for 35 years here.

but you can also be flooded with other things beside water, so using the word flooded instead would not change anything

Like a previous poster indicated the Spanish, inondations is flooded in French

Of course it's how language works!

If it was clear from the context, the 'with water' wouldn't be needed. It wasn't clear, so in this specific instance, it was needed.

Interesting etymological links, but not really relevant to clarity in English, where flooded means flooded and inundated has additional meanings…