Storm Water Surface Runoff Coefficients

Reference data and engineering information about storm water surface runoff coefficients for miscellaneous applications.

stormwatersurfacerunoffCalculator

Overview

Engineering reference data for Storm Water Surface Runoff Coefficients in miscellaneous.

Key Formulas

Unit Conversion

$y = x \cdot k$

Multiply by conversion factor.

Linear Interpolation

$y = y_1 + \frac{(x - x_1)(y_2 - y_1)}{x_2 - x_1}$

Estimate between two known points.

Percentage

$p = \frac{\text{part}}{\text{whole}} \times 100\%$

Part as fraction of whole.

Variables

Symbol	Description	Unit
$x$	Input value	—
$y$	Output value	—
$k$	Conversion factor	—

Storm-Water Surface Runoff Coefficients

8 rows

Typical storm-water runoff coefficients for various surfaces
Surface	Runoff Coefficient(–)
Gardens, lawns, parks	0.05 - 0.25
Pavements, inferior block	0.40 - 0.50
Pavements, stone or brick	0.75 - 0.80
Pavements, asphalt	0.85 - 0.90
Roads, gravel	0.15 - 0.30
Roadways, macadamized	0.25 - 0.60
Roofs	0.70 - 0.95
Walks, gravel	0.15 - 0.30

Source: engineeringtoolbox.com

References

Original Source

Source: engineeringtoolbox.com