If the invert of the sewer is 18 inches above the crown of the water main, is the water main properly protected?
No, when the water main crosses below a sewer, the sewer must be constructed with water main equivalent pipe or else either pipe must be installed in a casing. The protection must extend on each side of the crossing until the normal distance from the water main to the sewer or drain is at least ten feet. In addition, the water main must be located at least 18 inches below the sewer. This 18 inches is a structural protection to prevent the sewer from settling and breaking the water main.
Related Questions
- Can the water main and sewer be installed in the same casing pipe when boring under roads, railroad tracks, streams, or other similar situations?
- If the invert of the sewer is 18 inches above the crown of the water main, is the water main properly protected?
- Is it just road, street, bridge, sanitary sewer, or water main (those items specifically enumerated in the law)?
