Trenchless technology is a form of underground construction that requires the use of few or no trenches at surface or street level. Trenchless technology uses new techniques and equipment to install or replace underground infrastructure without causing disturbance to the ground above. Its goal is to avoid interfering with surface-level activities, including traffic, businesses, residential areas or people.Trenchless construction includes such construction methods as tunneling, microtunneling, horizontal directional drilling, pipe ramming, pipe jacking, auger boring and other methods for the installation of pipelines and cables below the ground with minimal excavation. On the rehabilitation side, Trenchless rehabilitation includes such construction methods as sliplining, thermoformed pipe, pipe bursting, cured-in-place pipe (CIPP), grout-in-place pipe, mechanical spot repair, and other methods for the repair, rehabilitation, or replacement of existing buried pipes and structures without excavation, or at least with minimal excavation.

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