Calculate the invert elevation of the sewer pipe, Civil Engineering

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1. The center line elevation of the proposed roadway at station is 345+25.50 is 327.36-ft. The existing ground top of cut elevation (ft) is most nearly:

2. A design engineer commissioned a test pit to determine the top of pipe elevation for a sewer extension project. The existing sewer pipe is an 8-ft o.d. reinforced concrete pipe with wall thickness 10-in. A back sight to a local benchmark with an established elevation of 45.66-ft is obtained with a level and a rod reading of 4.91-ft.

A foresight is taken to a rod resting on the top of pipe with a reading of 12.43-ft.

Calculate The invert elevation (ft) of the sewer pipe.

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