This is what a healthy catch basin looks like:
Greenspace not parked on,
Clear of debris,
And most importantly: FLOWING.
If you see a catch basin surrounded by water today it is either because:
it is the lowest spot in the area (note the area in the background),
it is blocked and you can clear the blockage (and why not littering is important),
Or the city needs to MUCK out the catch basin.
Today is the day to do this assessment in your neighborhood.
If you see a problem be specific with the street address and call it in to 311
or better yet send a photo and an email to email@example.com.
You don't see the problem when it's dry.