If the ground is at an elevation of 671, and the invert of a pipe is 669, how deep is the pipe? - Quora
manhole with different invert levels ? - OpenFlows | Water Infrastructure Forum - OpenFlows | Water Infrastructure - Bentley Communities
If the ground is at an elevation of 671, and the invert of a pipe is 669, how deep is the pipe? - Quora
![Measurement data for the invert level close to manhole 2 (see Figure... | Download Scientific Diagram Measurement data for the invert level close to manhole 2 (see Figure... | Download Scientific Diagram](https://www.researchgate.net/profile/Francois-Clemens/publication/259740877/figure/fig7/AS:668431472918535@1536377890578/Measurement-data-for-the-invert-level-close-to-manhole-2-see-Figure-8-The-dashed-lines.png)