What can lead to the formation of rills and gullies on a slope?

Inadequate erosion and sediment control practices can significantly contribute to the formation of rills and gullies on a slope. When proper erosion control measures, such as silt fences, sediment basins, or vegetation cover, are not implemented or are insufficient, surface water runoff can increase. This runoff can begin to erode the soil, particularly in areas with compacted or bare soil, leading to the development of rills—small, narrow channels formed as water flows over land. If this erosion continues unchecked, rills can expand and deepen over time, eventually turning into gullies, which are much larger and more pronounced channels.

Effective erosion and sediment control practices are essential for managing runoff and protecting the integrity of slopes. Without these measures, the erosive power of water can easily overcome the natural resistance of soil, leading to significant landscape alterations that may require costly remediation efforts. Maintaining adequate ground cover and implementing robust controls can mitigate these erosion risks and preserve slope stability.