When I was in a small city in China visiting my relatives, they pointed at some of the 50cm by 50cm "drains" on the street gutter filled with shattered stones.

When I was in a small city in China visiting my relatives, they pointed at some of the 50cm by 50cm "drains" on the street gutter filled with shattered stones. In the beginning, they had metal guards but they kept getting stolen. Then they had concrete guards with a metal wire skeleton. Those covers got smashed and the metal wires taken out of them. Now they just have concrete guards but people smash them anyway.