Which of the following may represent the coefficient of runoff for dense grass?

Which of the following may represent the coefficient of runoff for dense grass?

• A. -0.2
• B. 0.2
• C. 0.95
• D. 1.2

Answer: (B)

The coefficient of runoff is a crucial component in hydrology that helps quantify how much precipitation will become surface runoff rather than infiltrating into the soil. For dense grass, the coefficient of runoff typically falls within the range of values that suggest a relatively high capacity for infiltration. The correct choice of 0.2 reflects this characteristic of dense grass ecosystems. Dense grass can absorb a significant amount of rainfall due to its root structure and soil-binding properties, which promotes infiltration. A coefficient of 0.2 indicates that approximately 20% of the rainfall will run off, while the remaining 80% will infiltrate into the soil. This aligns with hydrological principles where vegetative cover can significantly reduce surface runoff. In contrast, the other options present values that do not accurately represent typical conditions for dense grass. A negative value, such as -0.2, is illogical in this context since coefficients of runoff cannot be negative; they represent a fraction of precipitated water. A value of 0.95 suggests that almost all of the precipitation would run off, indicating very little infiltration, which is not characteristic of dense grass. Finally, a value of 1.2 exceeds the maximum possible runoff coefficient, as this would imply a runoff greater than the

The coefficient of runoff is a crucial component in hydrology that helps quantify how much precipitation will become surface runoff rather than infiltrating into the soil. For dense grass, the coefficient of runoff typically falls within the range of values that suggest a relatively high capacity for infiltration.

The correct choice of 0.2 reflects this characteristic of dense grass ecosystems. Dense grass can absorb a significant amount of rainfall due to its root structure and soil-binding properties, which promotes infiltration. A coefficient of 0.2 indicates that approximately 20% of the rainfall will run off, while the remaining 80% will infiltrate into the soil. This aligns with hydrological principles where vegetative cover can significantly reduce surface runoff.

In contrast, the other options present values that do not accurately represent typical conditions for dense grass. A negative value, such as -0.2, is illogical in this context since coefficients of runoff cannot be negative; they represent a fraction of precipitated water. A value of 0.95 suggests that almost all of the precipitation would run off, indicating very little infiltration, which is not characteristic of dense grass. Finally, a value of 1.2 exceeds the maximum possible runoff coefficient, as this would imply a runoff greater than the