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29.92 inches of mercury = ~406.78 inches of water.
35 inches of water = 1.26 psi
0.5 psig = 420.62 inches of water column.
The reason is quite simple. Your water pipes are under your house, condo, apartment, etc. the higher up you use the water the lower the water pressure, because it uses more pressure to move the water up to the 2nd floor than to the first thus weakening the stream of water.
the water goes into a cycle which means that the water gets hotter as it gets closer to the sea floor.
Your trap arm should be coming out from the wall at a height from the floor of 16-18", the cleanout just below the tee on the plumbing stack. The water lines should be at around 10-12 inches above the floor
The other water lines are going to other fixtures. Your lines must be comming out of the floor for you to see the other lines. They are all teed together and only one line comming up to your faucet.
Inside the walls.
you should dig the floor.
It is detected by seeing lots of water on the floor but it has to be more than 5 inches
Cold water lines may have more insulation than hot water lines, otherwise they should both freeze unless there is some agent in the water.
The shower curtain should hang at least six inches below the edge of the tub to prevent water from spraying onto the floor. The curtain shouldn't hang too far into the tub or mold will develop on the curtain from trapped water.
4 inches
You should immediately try to mop up, or remove as much, if not all, of the water as you can. Leaving the water on the wood floor will cause it to warp out of shape.
You need to know the region's freezing depth. In southern Ontario it is 8 inches. Then you go down at least 12 inches to install the pipe. Be sure that as you excavate that no damage will be done to present lines which may be running.
The set frost line for Maine is 40 to 42 inches. All water lines and foundation footings should be below this depth to prevent damage or breakage.
Mop the floor with hot water and soap (let it sit on the floor for about 15 minutes) . If the floor is really dirty you can buy a mild floor stripping product from your hardware store or you can rent a floor buffing machine. When the top dirt has been removed you can scrub the grout lines by hand with a green scrubbing pad with soap and water.