What should be done immediately if rills appear in a surface roughening area?

When rills appear in a surface roughening area, it indicates that erosion is beginning to take place, which can worsen if not addressed swiftly. The appropriate response is to re-grade and re-seed the affected area immediately. This action helps restore the intended surface roughness and vegetation cover, both of which play critical roles in preventing further erosion. Re-grading helps to smooth the surface and reduce water runoff concentration, while re-seeding introduces new plant growth that stabilizes the soil and enhances natural erosion control.

Addressing the situation proactively minimizes the risk of further soil detachment and transport. Waiting for the next rainfall or ignoring the issue would allow the erosion process to continue, potentially leading to more extensive soil loss. Covering the area with plastic is not an effective long-term solution, as it may hinder the establishment of vegetation that is necessary for soil stabilization. Therefore, prompt action through re-grading and re-seeding is vital to mitigate erosion risks effectively.