Manhole Depth Measurement

Franz Holmes · 2015-05-31T21:11:00Z

Need to do some sewer manhole investigation. Can you guys suggest some techniques to get the invert elevations of sewer, drainage & water manholes? I saw a couple over the weekend and some are 2-3 m deep. I also need to get the inverts of pipes leading to each manhole. Some difficulties I see are :1. Not enough light to see details even with a strong flashlight.2. I have the idea of getting a sturdy 3 meter 1" water pipe & dropping it to the invert & measuring what is above the rim & do some plus/minus to get actual depth. First I was toying with the idea of sticking a rod with prism & measuring the prism point but I guess it would take a bit longer doing this method. Add to that the traffic concerns as some manholes are located middle/side of the roads so a quick open, measure & close process would be in order.3. How do you get the inverts of the pipes without really going under? Physically going down some of these manholes is impossible without any railings.Suggestions would be welcomed.

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Strictly Surveying

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nate-the-surveyor

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Thanks @Murphy.

Surveyors are taught from day one, to be self-sacrificing, dirt digging, shonestedt wielding, transit running, machete wielding, tick picking, hundredth reading, fly swatting, get-er-done type people. Climbing into a sewage structure should be a easy peasy...

It's our "chronic malady".

?ÿ

Posted : October 31, 2018 8:16 am

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Manhole Depth Measurement

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