Horizontal directional drilling (HDD) has become the preferred method of installing conduit and other utilities underground due to its low surface impact and minimal footprint. With HDD, there’s no need for trenching, digging, or closing the entire area to general traffic flow. Only a small area is needed at the starting point and another at the exit. When the job is complete there is only minimal surface disturbance.
The HDD method involves the pushing of a steerable, trackable drill head connected to the drill pipe from the entry point towards the exit point, as each pipe joint is used, another is added until the exit point is reached. Then, a swivel is attached to the drill string and the product is pulled back to the entry point, completing the process.