Which condition suggests a need for surface drainage?

Which condition suggests a need for surface drainage?

• A. More than 2% slope
• B. Less than 2% slope, ponded
• C. Well-drained soils
• D. Excessively drained soils

Answer: (B)

The condition indicating a need for surface drainage is when the slope is less than 2% and there is evidence of ponding. This scenario typically suggests that water does not easily move away from the surface, leading to standing water accumulation. Poor drainage can create a range of issues, including problems for plant roots, increased mosquito breeding, and potential soil erosion as water stands and saturates the area over time. In contrast, a slope greater than 2% usually aids in promoting drainage, helping excess water to flow away more effectively. Well-drained soils have the capacity to absorb and process water without becoming oversaturated, while excessively drained soils can lead to drought-like conditions, which do not necessitate additional drainage measures. Thus, the presence of standing water in flat areas with limited drainage underscores the need for interventions like surface drainage to mitigate potential agricultural and environmental issues.

The condition indicating a need for surface drainage is when the slope is less than 2% and there is evidence of ponding. This scenario typically suggests that water does not easily move away from the surface, leading to standing water accumulation. Poor drainage can create a range of issues, including problems for plant roots, increased mosquito breeding, and potential soil erosion as water stands and saturates the area over time.

In contrast, a slope greater than 2% usually aids in promoting drainage, helping excess water to flow away more effectively. Well-drained soils have the capacity to absorb and process water without becoming oversaturated, while excessively drained soils can lead to drought-like conditions, which do not necessitate additional drainage measures. Thus, the presence of standing water in flat areas with limited drainage underscores the need for interventions like surface drainage to mitigate potential agricultural and environmental issues.