Emerging Technologies for Conveyance Systems: New Installations and Rehabilitation Methods.

摘要

In the year 2000, the United States operated 21,264 collection and conveyance systems that included both sanitary and combined sewer systems (EPA's Clean Watersheds Needs Survey 2000 Report to Congress). Publicly owned sewer systems in the country account for 724,000 miles of sewer pipe and privately owned sewer pipe comprises an additional 500,000 miles (EPA's Report to Congress: Impacts and Control of CSOs and SSOs, August 2004). Most of our nation's conveyance systems are beginning to show signs of aging, with some systems dating back more than 100 years (American Society of Civil Engineers, 1999). Over time, a wide variety of materials and practices have been used for maintenance and repair. Sanitary and combined sewer overflows may be the result of improper operation and maintenance of sanitary, combined, and/or storm sewer systems, which can include structural, mechanical or electrical failures, collapsed or broken pipes, and insufficient capacity. The outcome of programs for overflow control and infrastructure asset management has resulted in a search for reliable, cost-effective conveyance system technologies. The purpose of this document is to provide a source of comprehensive and detailed information on the newer technologies available.