What does slow surface drainage without cover indicate in terms of slope?

What does slow surface drainage without cover indicate in terms of slope?

• A. 2-5%
• B. 0-2%
• C. 5-12%
• D. Above 9%

Answer: (B)

Slow surface drainage without cover typically indicates a very gentle slope of 0-2%. In this range, the slope is not steep enough to facilitate quick runoff of water, which can result in prolonged moisture retention and poor drainage conditions. The absence of cover, such as vegetation, can exacerbate this by failing to assist in allowing water to infiltrate the soil efficiently or to be absorbed by plants. In contrast, steeper slopes, such as those greater than 5%, often promote faster drainage due to the increased gravitational pull, allowing water to run off quickly rather than settle on the surface. Therefore, the indication of slow drainage without vegetation aligns logically with the gentle slopes of 0-2%, reinforcing the understanding of slope impact on drainage patterns.

Slow surface drainage without cover typically indicates a very gentle slope of 0-2%. In this range, the slope is not steep enough to facilitate quick runoff of water, which can result in prolonged moisture retention and poor drainage conditions. The absence of cover, such as vegetation, can exacerbate this by failing to assist in allowing water to infiltrate the soil efficiently or to be absorbed by plants.

In contrast, steeper slopes, such as those greater than 5%, often promote faster drainage due to the increased gravitational pull, allowing water to run off quickly rather than settle on the surface. Therefore, the indication of slow drainage without vegetation aligns logically with the gentle slopes of 0-2%, reinforcing the understanding of slope impact on drainage patterns.