Nan, It looks as if those pots, or planters, have no drainage. There are probably pots inside the planters we see; the inside pots would have to have some drainage. There's probably enough space in the outer planters to catch excess water which would run through the pots. Also, if there's flooring underneath, which wouldn't be harmed by a bit of runoff, it could be harmless.

Kristy, Please don't apologize for asking a logical question - especially in this often tedious comment section. ...Potted plants often get little of the rain which falls on them. Rain doesn't always penetrate deeply in pots, especially if the plants create their own 'umbrella' by branching out in a dome to cover the ground beneath them, which plants of many kinds do in order to shade their roots and minimize evaporation. Problem is that this umbrella/dome sends the water out beyond the pot, allowing little to no water to fall in the pot. Hence the need for additional watering. ...Also, it could be in an area of minimal rainfall. Where I live, we get only 14 inches / 35cm of rain per year, yet there are persons here who are able to gather so much rain and fog runoff (lots of fog here) that they don't ever have to water. That requires more than what is shown in this foto, but it's the same idea.