When are underground pipes hardest to detect?

Underground pipes are hardest to detect when digging in hard soil. This situation presents several challenges that complicate the detection of pipes. When the soil is compacted and hard, it is often more difficult for ground-penetrating radar or other detection tools to effectively identify the pipes, as the density can inhibit the signals from penetrating clearly. Additionally, the resistance from hard soil can make it harder for operators to feel any changes in material while digging, increasing the risk of accidentally damaging the pipes.

In contrast, wet soil tends to provide better conductivity for detection methods and can make the detection of pipes more feasible due to the reduced compactness. Loose soil also allows for easier excavation and can help detect irregularities more readily, as pipes may shift or create a noticeable difference in the soil structure.