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Home > Forums > Civil / Environmental Engineers > Activities > Earthwork/grading engineering Forum

Invert elevation and Rim elevation

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Atwerp (Mechanical) (OP)

15 Sep 06 15:53

Can anyone explain to me what the definition of Rim and invert elevations are on a sotrm drain drawing?

Thanks,

Atwerp

LHA (Civil/Environmental)

15 Sep 06 16:13

Rim, on a manhole, also Top of Grate on an inlet, is the elevation of the top of the cover on the manhole, or the inlet grate on an inlet. In a roadway, they darned well better be final grade, in grass they can be sumped, flush or stick up.

Invert of the pipes in and out is the elevation at the bottom of the inside pipe wall, not the bottom of the pipe.

Invert of the structure (MH or inlet) is the bottom of the inside of the structure, not the excavation depth.

Engineering is the practice of the art of science - Steve

BelspringKen (Civil/Environmental)

15 Sep 06 16:14

The rim is the top of the structure.

The invert is the elevation in the "bottom" of the pipe(s) going into and out of the structure.

bimr (Civil/Environmental)

19 Oct 06 10:01

lha (Civil/Environme)is correct. Pipe invert is the elevation of the bottom of the inside pipe wall, not the bottom of the pipe. In addition, the pipe invert is located at the end of pipe inside of the structure.

BelspringKen (Civil/Environmental)

19 Oct 06 10:06

"Bottom of the inside wall" is what I should have said - thinking one thing, typing and posting another.
Iha and bimr are correct. (I need to Preview these posts more often)

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