Underground Infrastructure - May 2023 - 36
Manhole Inspection
Technologies
By NASSCO Member David Hamberlin, Hydromax USA
If you attend a wastewater conference or read any
sewer industry magazine, you will undoubtedly see
multiple technologies for inspecting sewer
manholes or underground structures. Each one
has its main salespoints or technologies, but what
are they providing you? How can you utilize these
technologies to streamline and improve your
inspection program?
The first question prior to seeking out any new
technology is what do you want the deliverable to
provide, and how do you plan to utilize this
information? The answer to these questions will
help you when engaging in conversations with
technology or service providers. Are you mainly
concerned with a visual inspection of the structure,
or do you want not only the visual inspection, but
also the ability to measure items like pipe sizes,
depths, and defects at a later date? This decision
will have an impact on the equipment or inspection
cost for the project.
For visual inspections there are many options
available on the market. From off-the-shelf action
video cameras and 360-degree cameras, to
industry specific inspection tools with multiple HD
cameras. Regardless of the camera used, one key
to any successful inspection is the lighting. You
must be able to properly illuminate the structure for
the camera without over-illuminating it, which can
wash out the video or pictures.
When it comes to getting measurements from the
inspection technologies, the two ways
measurements are taken are either via
photogrammetry, or with a LiDAR measurement.
LiDAR stands for light detection and ranging.
* Photogrammetry involves taking multiple
overlapping pictures of an object that are then
stitched together or converted into a 2D or 3D
model using algorithms. These models are then
used by software to allow the end user to take
desired measurements.
* LiDAR uses lasers that are transmitted from a
source, then the laser reflects back to the
source from the object being scanned. The unit
then reads the reflected light at a receiver using
a system called time of flight to calculate
distances for measurement.
Underground Infrastructure - May 2023
Table of Contents for the Digital Edition of Underground Infrastructure - May 2023
Underground Infrastructure - May 2023 - 1
Underground Infrastructure - May 2023 - 2
Underground Infrastructure - May 2023 - 3
Underground Infrastructure - May 2023 - 4
Underground Infrastructure - May 2023 - 5
Underground Infrastructure - May 2023 - 6
Underground Infrastructure - May 2023 - 7
Underground Infrastructure - May 2023 - 8
Underground Infrastructure - May 2023 - 9
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Underground Infrastructure - May 2023 - 11
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Underground Infrastructure - May 2023 - 17
Underground Infrastructure - May 2023 - 18
Underground Infrastructure - May 2023 - 18A
Underground Infrastructure - May 2023 - 18B
Underground Infrastructure - May 2023 - 18C
Underground Infrastructure - May 2023 - 18D
Underground Infrastructure - May 2023 - 19
Underground Infrastructure - May 2023 - 20
Underground Infrastructure - May 2023 - 21
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