Under Ground Drainage Vents
If you run into something that looks like this more than likely
they are vent pipes for underground drainage. If you have these on the
property you do have a possibility of them overflowing with large
amounts of water going into the street and hopefully not onto your
property.
These vent pipes are important components for the drainage system they
attach to and should never be covered up. If you do have problems
contact your local utility company for guidance.