I have a run of 116 ft +or- . The second question should I insulate and use heat tape. I live in Alaska

There must be a mechanical building code for this... the sewer line should be lower in the trench than the water. How deep is the trench? It should be deeper than the frost line, which varies from Juneau to Kaktovik for example... Some state agency in Anchor-Town can give the best answer... good luck...

Rsain2004 gave good advice!

It is a good idea to call the local code enforcement office and ask them what is required in terms of depth and how far apart the water and sewer need to be.

The sewer depth should be determined by where it connects into the main line or catch basin and pitch up a minimum of 1/8" per foot run (if 4" pipe or larger) from there to the house.

The water depth will need to be discussed in detail with codes enforcement.

Good luck!

MARK

Can i run sewer and water in the same tranch? I have a run of 116 ft +or- . the second question should i insulate and use heat tape. I live in Alaska
Hey Sterwart, First Questipn!
Chapter 12, Section 1206.4 of the Standard Plumbing Code titled Permitted Installation Near Drain or Sewer Line says, " The water service pipe may be placed in the same trench as the building and sewer provided thr following conditions are me;
a) The bottom of the water service pipe at all points shall be at least 12 inches above the top sewer line at its highest point.
b) The water service shall be placed on a solid shelf excavated at one side of the common trench.
Second Question!
Chapter 4, Section 417.1 titled Depth of Sewer and Water Service Outside of Building says, "No water or waste pipe shall be installed or permitted outside a building or in a exterior wall unless adequate provisions are made to protect such pipes from freezing and they shall not be placed above the frost line without the consent of the Plumbing Official.
As always, check with your local Building Department before beginning the installation. Good luck, Tom

The above answers explain just about everything you need to know to do your project. Perhaps, one more thing: install your water line below "freeze line". That's the point where soil freezes solid in winter. I am sure, "Freeze line" information can be easily obtained from your local Building Department or any plumber in pub. The "Freeze Line" depth varies with regions. Definitely insulate.