The plant handles a large portion of the drainage from the East Side of Manhattan. Sewage from the Financial District, Greenwich Village, the Lower East Side, Midtown East and the East Side up to 71st Street flows through 180 miles (290 km) of sewer pipes and interceptor pipes to the Thirteenth Street Pumping Station at 13th Street and Avenue D, from where it is sent under the East River to the plant. Normal influx is 170 million US gallons (450 million L; 100 million imp gal) a day, which increases to 300 million US gallons (450 million L; 100 million imp gal) during wet weather. When a significant overflow occurred during the New York City blackout of 1977, 828 million US gallons (3.134 billion L; 689 million imp gal) of raw sewage spilled into the East River), the federal government ordered in 1995 that the city build back-up facilities. Despite this, the Northeast blackout of 2003 produced 145 million US gallons (550 million L; 121 million imp gal) of raw sewage spilled. In 1998, the city started its program to expand the facility. Construction was completed in 2014, and the plant remained opened throughout the renovation process. The plant can now handle 310 million gallons of waste water per day, with about 250 million gallons being the daily average, representing about 18% of the city's wastewater.