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Updated ASCE Manhole Guidelines Focus On Issues, Rehab Methods
- First is to minimize the overall cost to the community of creating, maintaining and replacing structures; and
- Second is to achieve intergeneration equity through a planned approach to maintain and increase manhole life until eventual replacement of the structure is required.
"Through an effective manhole inspection program, agencies can accurately identify inventory and evaluate the condition of these structures," he concludes. "An archive trend history will also aid in determining the most cost efficient times for rehabilitation. Methods to remove excessive manhole infiltration and inflow reduce corrosion, improve manhole structural integrity, address public safety related issues and implement general system maintenance needs identified through consistent data gathering techniques.”
The word "manhole" has an interesting history, observes Richard (Rick) Nelson, vice president and director, conveyance infrastructure technology, CH2M Hill.
" ‘Manhole' was first used to describe the access holes between the decks of old sailing ships," he explains. "It wasn't until later that the term was used to describe the structure through which access to sewers for maintenance could be achieved. Perhaps the name was adopted because it was, in essence, a hole into which a person would go to do maintenance, or it was adapted from one level (street level) to another level (the sewer beneath the street).
"And the word ‘sewer' is derived from the term 'seaward' in Old English. Early sewers in the London area were open ditches which led to the Thames River, and from there on to the sea or “seaward'."
The ASCE Manhole Rehabilitation Committee members responsible for the second edition of Manhole Guidelines Manual 92 was composed of: Anthony Almeida, Halff & Associates; James H. Forbes, Pipeline Analysis; Joanne B. Hughes, RS Lining Systems; John F. Jurgens, Trenchless Resources Int.; Larry W. Kiest, LMK Enterprises; Mohammad Najafi, PH.D., PE, University of Texas at Arlington; Richard E. Nelson, CH2M Hill; Lynn Osborn, Insituform Technologies; William E. Shook, AP/M Permaform; John J. Struzziery, SEA Consultants; and Mark G. Wade, CH2M Hill.
Contributing authors, in addition to Forbes, Hughes, Jurgens and Shook, included: Marc Anctil, Logiball; Tim Back, P.E., Back Municipal Consulting; G. Alan Johnson, CH2M Hill; and Stephen Wierzchowski, RLS Solutions.