The water service for a building is put in at the same time as the sewer is connected and run into the house. For a 11⁄4-service pipe a 1⁄2-inch tap is furnished. The water company taps the main, at the expense of the plumber, and inserts a corporation cock.
Fig. 42. - Showing water main and sewer in same ditch.
The trench for the water main should be dug at least 41⁄2 feet deep or below frost level and the trench should be kept straight. When the sewer is put in at the same time, one side of the sewer trench can be cut out after it is filled up to the level of the water main. The water pipe can then be laid on this shelf at least 2 feet away from the original trench of sewer. Sometimes the surface of the ground must not be disturbed. In this case small holes are dug and the pipe is pushed through or driven through under that portion not dug. These places are often tunnelled (see Fig. 42).
In digging in city streets, care should be taken not to destroy any of the numerous pipes encountered.