What is the possible range for stormwater runoff coefficients?

What is the possible range for stormwater runoff coefficients?

• A. A. -0.90 to +1.25
• B. B. 0.00 to 1.00
• C. C. Depends upon geographic location
• D. D. Depending upon the desired design, storm frequency

Answer: (B)

The possible range for stormwater runoff coefficients is from 0.00 to 1.00. This range reflects the way different surfaces absorb and transmit water during a storm event. A coefficient of 0.00 indicates a surface that absorbs all rainwater (like a fully permeable ground), meaning no runoff occurs. Conversely, a coefficient of 1.00 suggests that a surface is completely impervious (such as concrete), meaning all rainfall leads to runoff. Values between these extremes represent various levels of permeability based on land cover types, with natural environments, grasslands, and forested areas tending to have lower coefficients, while urban and developed areas tend to have higher coefficients. The specified range effectively captures the general understanding of how different surfaces interact with rainfall in the context of hydrology and stormwater management.

The possible range for stormwater runoff coefficients is from 0.00 to 1.00. This range reflects the way different surfaces absorb and transmit water during a storm event. A coefficient of 0.00 indicates a surface that absorbs all rainwater (like a fully permeable ground), meaning no runoff occurs. Conversely, a coefficient of 1.00 suggests that a surface is completely impervious (such as concrete), meaning all rainfall leads to runoff. Values between these extremes represent various levels of permeability based on land cover types, with natural environments, grasslands, and forested areas tending to have lower coefficients, while urban and developed areas tend to have higher coefficients. The specified range effectively captures the general understanding of how different surfaces interact with rainfall in the context of hydrology and stormwater management.