In many cases the words scupper and sinkhole are used indifferently. But there is a nuance in their definition.
Although both are use to drain the water from the rain, as mentioned above, the sinkhole usually has the water inlet in a vertical direction.
However, both consist of a drainage system.
Thanks to the function of this system, which has other components, torrential water flows and their hazards are avoided. And, of course, they prevent the formation of floods that would be a serious danger to citizens.