How do i find actual invert elevation on a sewer pipe?

To find the actual invert elevation of a sewer pipe, you can use a level or surveying equipment to measure the height of the pipe from a known reference point, such as a manhole rim or ground surface elevation. The invert elevation is calculated by subtracting the measurement from the reference point's elevation. Additionally, you may refer to construction plans or as-built drawings that typically document the invert elevations. If necessary, verify the measurements with multiple points along the pipe.