Rainwater harvesting may have started out as a way to water gardens, but has become for some people the major source of water on their property. With the aid of ultraviolet lights, the last bit of bacterial can be killed in the water to make it potable.
There are many gardens in Philadelphia. Many are small, but don't forget about the backyards that can't be seen from the street.
The Philadelphia Water Department has begun a series of incremental rate increases. Many property owners, including myself are watching our bills grow and are stunned. I've been peddling my idea for a harvesting system around. The problem is with the building code. The parts and systems are available and just about off-the-shelf. The building code makes the implementation an expensive hassel. I'm looking for people who have been considering this option as a way to become sustainable and to lower their utility bills.
Please come to visit our city. We have one of the largest, if not the largest inner city park in the country. (Fairmount Park is much larger than Central Park)