Underground Construction - July 2022 - 26

Structural Rehabilitation
of Manholes
By NASSCO Manhole Committee Member V. Firat Sever, PhD, PE, QuakeWrap, Inc.
According to published reports, it is estimated that
there are over 20 million manholes in the USA and
many of them have reached or exceeded their
expected service life. Manholes are an important
component of a sewer system and can be a
significant source of infiltration and inflow (I&I).
Experience to date suggests a sewer rehabilitation
program excluding manholes will not adequately
address I&I issues. On the other hand, ongoing
deterioration of manholes can result in catastrophic
failure due to loss of structural integrity and failures in
deep manholes can easily reach seven figures in
repair costs.
it is important to utilize them to maximum extent
when taking on a manhole rehabilitation project.
First, the owner needs to set the goal of manhole
rehabilitation, which can be one of the following:
1. I&I reduction only
2. Structural improvement only
3. I&I reduction and structural improvement
Although there is often a correlation between I&I and
structural integrity, it is possible that a manhole can
be intact and yet still be a source of significant I&I. It
is also important to note that these conditions are
usually related and can exacerbate each other. For
instance, structural integrity of a manhole can be
compromised due to I&I washing away surrounding
soil, or cracks and gaps present due to structural
issues, resulting in more rain and groundwater entry.
Replacement efforts after a deep, collapsed manhole.
Many utilities in North America and around the globe
invest in rehabilitation of their manholes to improve
overall sewer system performance by reducing
extraneous flows into treatment facilities, prevent
catastrophic failures, and as a good asset
management practice, to increase the value of an
important system asset.
As manhole rehabilitation has become more common
over the years, more information is now available on
design, material selection, installation, and quality
assurance. NASSCO's Manhole Assessment
Certification Program (MACP™ ) is a comprehensive,
systematic approach for inspection. Following
collection of field data using MACP methods,
As a part of a United States Environmental
Protection Agency (EPA) sponsored project (through
then Water Environment Research Foundation), a
diverse team led by the author investigated the
structural capabilities of manhole rehabilitation
methods with respect to the second and third goals
listed above. The project lasted for approximately
two years and included an expert workshop, a
comprehensive testing protocol with various
materials and methods, case study gathering, and
computational modeling with the finite element
method. Several publications are available that
covered the details of the project including the main
report (available at Water Research Foundation's
website: www.waterrf.org). The USEPA/WRF study
classifies manhole rehabilitation materials and
methods into three categories, which is a simplified
version of AWWA Classification of water main
rehabilitation methods:
http://www.waterrf.org

Underground Construction - July 2022

Table of Contents for the Digital Edition of Underground Construction - July 2022

Contents
Underground Construction - July 2022 - Cover1
Underground Construction - July 2022 - Cover2
Underground Construction - July 2022 - Contents
Underground Construction - July 2022 - 4
Underground Construction - July 2022 - 5
Underground Construction - July 2022 - 6
Underground Construction - July 2022 - 7
Underground Construction - July 2022 - 8
Underground Construction - July 2022 - 9
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Underground Construction - July 2022 - Cover3
Underground Construction - July 2022 - Cover4
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