Activity Feed › Discussion Forums › Strictly Surveying › High Velocity Inverts
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Thank you all for the replies. I haven’t been logged in for a bit. I like many of the ideas but I’m still on the fence as about it as well. I think going at night will help out tremendously.
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not my real name, post: 396348, member: 8199 wrote: First of all, I would refuse to do this. Secondly, it is hydraulics, not hydrology.
The time to get record information on how the pipe was constructed is when
it is being constructed and not afterward. Once there is back fill over the pipe
that is all I see.Then the assumption that people will want you to make after you obtain the invert
elevations is to calculate the slope of the pipe between the manholes.Without seeing the pipe there is no guarantee that it was laid straight or at a constant
slope. I would not assume any liability without these assurances.Yeah, I believe the municipality has lost the as built info, etc. Definetly going to hit on all those “assumptions” in the contract and have some careful language.
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We haven’t done it in a few years, but we used to do river cross sections in some pretty extreme flows from a jetboat. We bought several 10′ lengths of 1″ steel electrical conduit with threaded ends and used as many as were necessary for each site. In our scenario we had a prism mounted on the top section of the rods and shot it from shore at each point. For your situation I would probably duct tape a level rod to the conduit at some fixed distance from the bottom and read that.
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