When the sewage and stormwater flowing from District towns is combined, it exceeds the capacity of the existing sewer pipes. Large “interceptor pipes” must be installed to increase capacity and convey the flow to the treatment plant. The largest project in Phase I was the installation of a mile long, five-foot diameter interceptor pipe on Homestead Avenue, which won the National 2011 Public Works Project of the Year for the first-time use of curved micro-tunneling technology in the United States.