If a trenchless method is inappropriate, we revert to the more traditional open trench method of installation. A trench is excavated running parallel to the old water main and the new pipe is laid in this trench. The technique is suitable for all pipe materials, however, disruption to road users is greatest and costs of reinstatement can be high.
All techniques require an excavation at the point of connection of the customers service pipe and stop valve to enable the customers service pipe to be transferred to the new main.
In the photo below an open trench water mains renewal is in progress in a residential area . The trench has been excavated and the new pipe is in the process of being installed.
In the photo below an open trench water mains renewal is in progress in a rural area . The excavated trench awaits installation of the pipe. Once installed the trench is backfilled and the road / verge reinstated to match as nearly as practicable the original surface.