What is the Purpose of a Manhole?
We often get asked about the purpose of manholes and the
uses of manholes. And the answer is, that there are many functions of
manholes when it comes to sewer or stormwater systems. The four main purposes
of a manhole are:
- To facilitate
inspections of the sewer or stormwater system as well as maintenance
projects such as cleaning or removal of obstructions within the sewer or
stormwater line
- To
assist in ventilation of the sewage system by allowing gases to escape
- To
allow the municipality to join sewer or stormwater systems, change the
direction of the sewer or stormwater system, or align the sewer or
stormwater system
- To
assist in ensuring the sewer or stormwater line is laid in convenient
lengths
Common Manhole Locations
Manhole locations vary, however, due to their primary functions they are typically located in the below areas:
• Where there is a junction of two sewer or stormwater lines (or more)
• At locations where the sewer or stormwater line changes sizes
• In situations where the sewer or stormwater line alignment changes
• When the grade of the sewer or stormwater line changes
Manholes are also periodically placed along the sewer or stormwater line for easy maintenance access. This placement varies depending on the diameter of the sewer or stormwater system in question.
The Different Types of Manholes
Manholes typically fall into one of three categories, which
are shallow, normal, and deep. The type of manhole chosen for a specific area
depends on both the size of the sewer or stormwater line as well as the
function that the manhole is supposed to serve.
Shallow Manholes
Also known as inspection chambers, shallow manholes are only
approximately two to three feet deep. They are typically located at the start
of a sewer or storm water branch and are placed in areas that are not heavily
trafficked.
Normal Manholes
These types of manholes are typically about 150 centimeters
or five feet deep. They are located in the sewer or storm water line and
include a heavy manhole cover that is typically square or rectangular in shape.
Deep Manholes
Any manhole deeper than 150 centimeters is considered a deep
manhole. These manholes incorporate a method for entry, such as a built-in
ladder, always incorporate a heavy manhole cover.
download manhole details in autocad format
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