MTA's Raised Storm Grates
Now it doesn’t look extremely comfortable, but I think it’s quite a creative solution!

When an August 2007 rain storm completely flooded the New York City subway system, the MTA recognized a problem at street level. Because ventilation grates were flush with the sidewalk and fed directly into subway stations that weren’t very deep underground, numerous stations – particularly in Queens – were completely overrun with water.

To solve this problem, the authority proposed in late 2008 a reconceptualized subway grate that would also double as street furniture. By July of 2009, the $31 million flood-prevention plan was fully in place with grates along Sutphin and Queens Boulevards among other areas susceptible to flooding.

Via Second Avenue Saga