Mitigation of Impacts to Streams in DC Using Trenchless Sewer Rehabilitation Method

摘要

This paper will describe how DC Water managed and implemented sanitary sewer rehabilitation with non-intrusivetrenchless technology to protect newly reconstructed streams, vegetation, and parkland in Washington, DC.The Watts Branch Sewer Rehabilitation Project was originally initiated when the Department of Energy andEnvironment, US Fish and Wildlife Service, and the Natural Resources Conservation Service of the United StatesDepartment of Agriculture (USDA) unveiled preliminary plans to perform a natural stream restoration for WattsBranch. The Watts Branch stream is the longest tributary of the Anacostia River in the District of Columbia.DC Water determined that an assessment of the condition of the infrastructure in the area of the stream restorationwould be vital and conducted a thorough investigation of the sewer in and around Watts Branch stream. Based onthe results of these inspection, rehabilitation projects were divided into phases giving priority to the work that wasabsolutely necessary to begin prior to the stream restoration projects, which involved open cut replacement.