For a slope of 5-14%, which drainage condition is applicable?

In the context of soil drainage conditions applicable to slopes of 5-14%, medium surface drainage with cover is the most appropriate choice. This slope range indicates a moderate angle, which allows for effective water runoff while still retaining the ability to hold moisture compared to steeper slopes.

The presence of cover, such as vegetation or organic matter, plays a crucial role in enhancing the soil's drainage characteristics. It can help reduce surface erosion, promote infiltration, and maintain moisture levels in the soil. The cover also aids in stabilizing the soil, thereby preventing it from becoming overly compacted or prone to runoff.

In contrast, rapid surface drainage is more applicable to steeper slopes where water moves quickly away, potentially leading to erosion. Slow surface drainage usually correlates with flatter areas or those with poor soil structure that retains water. Medium surface drainage without cover would not account for the beneficial effects of vegetation, which is critical in managing water movement effectively on moderate slopes. Thus, the correct choice reflects the interplay of slope gradient and the advantages provided by ground cover in facilitating proper drainage.