water main

Non-naturally occurring sinkholes can form because of water main breaks, sewer collapses, or even abandoned mines.

If the head in the water main is constant, then a definite quantity of water would be delivered in a given time.

Where fire hydrants are provided, the size of the water main should not be below four inches.

He had been sent to write up a butcher shop that had been flooded from a broken water main.

It is best not to take the water direct from the water-main, but from a cistern about fifteen feet above the nozzle.

If an excessive pressure is obtained in the boiler, it is relieved in the water main.