digplanet beta 1: Athena
Share digplanet:


Applied sciences






















PMG manholes in a city street, Perth, Western Australia.
Manhole in Belo Horizonte, Brazil.
This is a sewer manhole, exposed during construction. Typically, only the top ring and manhole cover (not pictured) would be visible.
Manhole cover of precast concrete in Germany

A manhole (alternatively utility hole, cable chamber, maintenance hole, inspection chamber, access chamber or confined space) is the top opening to an underground utility vault used to house an access point for making connections or performing maintenance on underground and buried public utility and other services including sewers, telephone, electricity, storm drains and gas.


The manhole opening is protected by a manhole cover (also known as a "biscuit"[citation needed]), a flat plug designed to prevent accidental or unauthorized access to the manhole. Those plugs are traditionally made of metal, but may be constructed from precast concrete, glass reinforced plastic or other composite material (especially in Europe, or where cover theft is of concern).

Manholes are usually outfitted with metal, polypropylene, or fiberglass steps installed in the inner side of the wall to allow easy descent into the utility space. Because of legislation restricting acceptable manual handling weights, Europe has seen a move toward lighter weight composite manhole cover materials, which also have the benefits of greater slip resistance and electrical insulating properties.

The access openings are usually circular in shape to prevent accidental fall of the cover into the hole.

Manholes are generally found in urban areas, in streets and occasionally under sidewalks. In rural and undeveloped areas, services such as telephone and electricity are usually carried on utility poles or even pylons rather than underground.

Composite manholes[edit]

Composite (fiberglass) manholes are commonly used in applications where infiltration, exfiltration, or corrosion by hydrogen sulfide (from sewer gas) are a concern, or where structures need to be factory integrated into a manhole before placement.

Structures commonly integrated into composite manholes include:

  • Flow inverts[1]
  • Flumes[2]
  • Drop structures from higher elevation flows to lower elevation discharge pipes

Occasionally, composite manholes will integrate:

  • Weirs[3]
  • Storm water screening structures[4]
  • Sewage grinders[5]
  • Energy absorbing structures to dissipate undesirable flow stream turbulence or velocity[6]

Hazards caused by stray voltage in manholes[edit]

In urban areas, stray voltage issues have become a significant concern for utilities. In 2004, Jodie S. Lane was electrocuted after stepping on a metal manhole cover, while walking her dog in New York City.[7] One solution is the Electrified Cover Safeguard invention, which is an on-site, real-time stray voltage warning system which is being used in the street lights in New York City and is also being tested by ConEd and other utilities and municipalities in England, Europe, and Japan.[citation needed]

See also[edit]



  • Isles, Paul (2010). "Dover Engineering Works". Dover Life Magazine

Further reading[edit]

  • Ascher, Kate ; researched by Wendy Marech (2007). The works : anatomy of a city (Reprint. ed.). New York: Penguin Press. ISBN 978-0143112709. 

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Manhole — Please support Wikipedia.
A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia.
90928 videos foundNext > 

Grace Slick_ Manhole (1974) full album

Manhole is an album by Grace Slick. Her first solo record, it was released in 1974 1. "Jay" Grace Slick Grace Slick 2:43 2. "Theme from the Movie Manhole" Gr...

MANHOLE - Put Your Head Out (HD)

MANHOLE - Put Your Head Out Video Edition : K.P.I..

Manhole Installation Training Video - By Distribution Design Consultants, Inc.

APS Manhole Installation Training Video - Produced by Distribution Design Consultants, Inc. for Arizona Public Service - APS - Phoenix, AZ.

Manhole - Grace Slick

Theme from the Movie Manhole. A tribute to Grace, for her magnificent voice in this wonderful song, and to all the "open mind pionneers" of the seventies. Do...

Grace Slick - Manhole Theme (1974)

Sometimes it's easy to believe it, sound may be the warmest thing he's found. He just starts Playing, then he says to me, "Ready your body for love, there is...

Woman Forced into Manhole, Rescued 60 Hours Later

Woman Forced into Manhole, Rescued 60 Hours Later Woman Forced into Manhole, Rescued 60 Hours Later Woman Forced into Manhole, Rescued 60 Hours Later Terrify...


A typical installation of Stanton Bonna's low carbon footprint Perfect Manhole System. The Perfect Manhole System provides a fully sealed and watertight manh...

Manhole - Hypocrite


This video depicts the construction of a new manhole being installed over an existing line in a very tight area. I condensed this video to 9.5 minutes from t...

Manhole - Kiss or Kill (OFFICIAL VIDEO)

From the original album "All Is Not Well" released in 1996 on Noise Records and produced by Ross Robinson. This video is an homage to the movie "Angel Heart"...

90928 videos foundNext > 

4321 news items

Fayetteville Observer
Wed, 23 Apr 2014 20:56:15 -0700

Q: Who is responsible for fixing the sewer covers that have sunk on Cliffdale Road, from the library to right near the post office? There are four or five of them coming into Fayetteville, and most have been this way since the road was repaved several ...
The Hindu
Tue, 22 Apr 2014 21:07:30 -0700

A Division Bench of the Kerala High Court on Tuesday directed the Commandant General, Fire and Rescue Services, to conduct an inquiry into the death of two Tamil workers inside a manhole in the city. The Bench comprising Justice V.K. Mohanan and ...
Main Line
Tue, 22 Apr 2014 12:07:30 -0700

Manhole cover smashes into Saturn (video). Published: Wednesday, April 23, 2014. By Pete Bannan, pbannan@mainlinemedianews.com. A PECO crewman drags the manhole cover back to opening on Eagle Road in Haverford Township Tuesday. Photo ...
Emirates 24/7
Wed, 23 Apr 2014 21:18:45 -0700

Two camels were killed after falling into an uncovered manhole in Ras Al Khaimah while another camel was rescued, press reports said on Thursday. The camels were passing through that area in the Red Island in the northern emirate when they plunged ...

Bury Free Press

Bury Free Press
Wed, 23 Apr 2014 08:00:00 -0700

The A1065 Mundford Road at Brandon was closed to all traffic for three to four hours from 3.30pm this afternoon following the dangerous collapse of a BT manhole cover. The collapsed cover is close to the Weeting side of the level crossing with the ...
Orlando Sentinel
Tue, 22 Apr 2014 04:53:18 -0700

A man was trapped inside a manhole Monday night near a Winn-Dixie parking lot on Colonial Drive, Orange County Fire Rescue reported. The man fell into the hole, which is about six feet deep, right after 10 p.m. It is unclear who the man is and what he ...
Tue, 22 Apr 2014 08:11:15 -0700

Briscover.com from Hunan Common Future Arts and Crafts Corp. Ltd. is now offering a professionally manufactured composite manhole for to all new customers. The company that manufactures 100% composite material manholes now exports its manhole ...
The Onion (satire)
Thu, 17 Apr 2014 08:00:00 -0700

NEW YORK—Standing mystified in a crowded intersection, Verus Attius Glabrio, a Roman centurion who emerged from a manhole in the middle of New York's Time Square, is in for a wacky adventure, sources confirmed Wednesday. Reports stated that ...

Oops, we seem to be having trouble contacting Twitter

Talk About Manhole

You can talk about Manhole with people all over the world in our discussions.

Support Wikipedia

A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia. Please add your support for Wikipedia!