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Water mains. Sewer line.
Depends on locality as many of the one family homes require I install sewer mains from 4" - 6". The size of the "sewer" is based on fixtures units that are connected and to local codes
Every fixture sonnected to a sanitary or waste or soil line needs to be trapped and vented
Of course other wise someone may fall into the trench and many localities do not like water or sewer lines exposed thus the modern codes want the lateral and mains covered
Yes, as long as there is no obstruction to the front of the distribution panel. Code states that there has to be 3 foot clearance in front of the distribution panel.
The purposes of the clay pipe are used for sewage that generated by hydrogen sulfide , drainage, make clay tobacco pipes and also used in sewer gravity collection mains.
A sewer system is the sewer or the sysyem of the sewer.
If you do not have mains sewage it will go into a local septic tank on the property or near by. Where it will be treated an then discharged into a soak away. If you have mains sewage then it goes into the sewer pipes and can either flow out into a river or the sea, or more likely it will go to a sewage treatment works where it will be treated and cleaned. From there it can either be discharged into a river or sea or it might be treated and recycled.
"A sewer contractor works in the sewer system.
A sewer's protector is a thimble. Sewer as in sewing not sewerage!
The sewer is in the bathroom in the park.