Key:manhole
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 manhole
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| Description |
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Hole with a cover that allows access to an underground service location, just large enough for a human to climb through 
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| Group: Man made |
| Used on these elements |
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| Documented values: 2 |
| Requires |
| Useful combination |
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| Status: in use |
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Specifies man_made=manhole type.
Where pipeline themselves have not yet been discovered, it can be beneficial for future mappers to mark the locations of manholes for later uses.
Values
manhole=* can take any values, but the following are the first set in use
- plain:
manhole covers with no markings at all available - unknown: manhole cover with unknown markings, or of unknown use. Combine with label=* when possible for later identification.
- water: maintenance access to clean water pipelines
- rainwater: maintenance access to rainwater pipelines (consider using drain)
- sewer: maintenance access to pipelines carrying wastewater (sewage)
- drain: surface water drain for removing rainwater
- heat: district heating maintenance holes
- cold: district cooling maintenance holes
- gas: maintenance access to gas transport pipelines
- telecom: maintenance access to pipelines containing telecommunication cables
- power: access to underground electricity wires
- other: all you can think of
Tips on surveying
Often the manhole covers themselves don't feature a description of what's below, but you'll find a marker on a nearby wall, or on a dedicated stick or ventilation shaft. On such markers you might be able to read the distance to the manhole along with a diameter of the pipeline and/or an indicator of pipeline contents; some markers feature a number suitable for the tag ref=*.
When the cast iron covers themselves read "40" or "25", it's usually just a maximum weight restriction (in tonnes).