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What is rim elevation of a manhole?

Updated: 9/15/2023
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Wiki User

11y ago

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Rim, on a manhole, is the elevation of the top of the cover on the manhole. In a roadway the rim will at be final grade, in grass they can be sumped, flush or stick up.

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11y ago
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Christopher Vickers

Lvl 1
1y ago
How do you get the rim elevation of a manhole say you got Hoi but then you shoot your rim what do you do with the numbers now

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How do you calculate the invert elevation of a manhole?

Invert elevations can usually be found directly on as-built drawings of the sewer facility. The simplest way to calculate an invert elevation of a manhole is to measure the depth of the manhole from the surface to the pipe invert. The invert elevation equals the ground or rim elevation minus this depth. If you do not know the rim elevation or invert elevation, a surveyor must measure the invert and/or rim elevation with reference to a nearby elevation benchmark (see: http://commons.wikimedia.org/wiki/Image:Elevation_Benchmark.jpg). Also, upstream and downstream invert elevations in a manhole typically differ by about 0.1 feet.


What is the obvert elevation of a manhole?

The obvert elevation of a pipe is the elevation of the inner top surface of the pipe (as opposed to "invert" which is the inner bottom surface of the pipe). Invert (and obvert) is usually used in reference to pipe and not manholes, since the invert elevation is where the water flow calculations begin. Based on this interpretation, the obvert (at a manhole) can be measured as the distance from the manhole rim to the inside top of the pipe(s).


What is a manhole invert?

A manhole invert is the pipeline running across the bottom of the manhole, from the point where the incoming pipe enters until the outgoing pipe discharges the outflow. It is frequently expressed as an elevation level where this pipeline sits.


What is a drop manhole?

A manhole invert is the pipeline running across the bottom of the manhole, from the point where the incoming pipe enters until the outgoing pipe discharges the outflow. It is frequently expressed as an elevation level where this pipeline sits.


What is the elevation of the south rim of the Grank Caynon?

According to the National Park Service (www.nps.gov/grca/grandcanton/south-rim/), the elevation on the South Rim of the Grand Canyon averages about 7000 feet (2100 meters). The North Rim is about 1000 feet (300 meters) higher.


What is the elevation of the grand canyon?

At the entrance to the North Rim of the Park, is a tower at elevation 9165 feet (433 meters).


What is the altitude of the south rim of the Grand Canyon?

At the entrance to the North Rim of the Park, is a tower at elevation 9165 feet (433 meters).


Which section of the Grand Canyon National Park is the wettest?

The North Rim because of the higher elevation..


When did The Manhole happen?

The Manhole happened in 1988.


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What is the minimum spacing between manhole to manhole?

30ft


When was The Manhole created?

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