Describe one method of trenchless pipe installation.

Horizontal directional drilling (HDD) is a widely-used trenchless pipe installation method that involves drilling a horizontally-directed borehole through the ground and then pulling the new pipe into place. This technique is particularly advantageous because it minimizes surface disruption, allowing existing infrastructure, landscaping, and roadways to remain undisturbed while the installation occurs beneath.

HDD is often utilized in urban environments where traditional methods like open trench digging would cause significant interruptions to daily activities and could potentially damage existing utilities. The process typically begins with a pilot hole being drilled along the desired path. Once the hole is established, it is enlarged to accommodate the pipe being installed, which is then pulled back through the borehole. This method not only allows for the efficient installation of various types of pipes, including those for water, gas, and telecommunications, but also helps in maintaining the integrity of the surrounding environment.

In contrast, methods like vertical drilling may not align with trenchless technology, as they often involve larger disturbance of the surface. Open trench digging directly undermines the benefits of trenchless techniques, as it entails excavating a trench along the entire length of the pipe run. Pipe bursting, while also a trenchless method, is specific to replacing old pipes rather than installing new