RAINDROPS ON ROOFTOPS

摘要

It takes only one-tenth of an inch of rainfall to overwhelm New York City's sewer system, which as a result sends 27 billion gallons of raw sewage into New York Harbor each year. Though the system was designed to carry storm water as well as waste, the Big Apple has gotten a bit too big for its aging infrastructure.rnIn January, New York joined other cities, such as Portland, Oregon, and Milwaukee, that have adopted policies promoting green infrastructure, which diverts and absorbs storm water before it reaches the sewer system.