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HANDBOOK: SEWER SYSTEM INFRASTRUCTURE ANALYSIS AND REHABILITATION
Citation:
Smith, J. M., R. P. Bowker, AND H. J. Shah. HANDBOOK: SEWER SYSTEM INFRASTRUCTURE ANALYSIS AND REHABILITATION. U.S. Environmental Protection Agency, Washington, DC, EPA/625/6-91/030 (NTIS PB93116309), 1991.
Impact/Purpose:
To inform public.
Description:
Many of our Nation's sewer systems date back to the 19th Century when brick sewers were common. hese and more recent sewer systems can be expected to fail in time, but because they are placed underground, signs of accelerated deterioration and capacity limitations are not readily apparent until there is a major failure. Sewer pipe failures start with cracking, lateral deflection, crown sag and offset joints, as well as by deteriorated mortar and exposed reinforcing caused by hydrogen sulfide (H2S) corrosion. Prolonged neglect results in cracked pavement, collapsed streets, backed-up sewers, streams and ground-water contamination or local flooding. Proper sewer evaluation and maintenance schedules would help identify the condition of sewer system's infrastructure, and timely rehabilitation could save large expenditures required to replace the deteriorated sewers and extend the sewer use life. This Handbook provides guidance on evaluating and rehabilitating existing sewers. It presents information on typical problems, procedures, and methods for rehabilitation, case studies, budgetary costs, advantages and disadvantages of rehabilitation techniques, and application of these techniques and materials/equipment used in rehabilitation. Guidance is given on the importance of, and ways for, conducting the sewer system evaluation and identifying the rehabilitation procedure that best suits a particular problem. The latest information on state-of-the-art sewer rehabilitation techniques is presented, as well as detailed cost estimates for each technique. The techniques addressed are excavation and replacement, chemical grouting, insertion lining, inversion lining, specialty lining, liners, coatings and building sewers.