Urban Runoff Coefficient

METEOROLOGY – HYDROLOGY & FLOOD CALCULATOR Urban Runoff Coefficient A precise tool.
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What is the Urban Runoff Coefficient & How does it work?

The Urban Runoff Coefficient (C) is a dimensionless parameter used in hydrology to estimate the amount of rainfall that becomes surface runoff. It represents the fraction of total rainfall that flows over the land surface rather than infiltrating into the soil.

Q = C times P times A
Q = Runoff volume (m³)
C = Urban runoff coefficient
P = Precipitation depth (mm)
A = Catchment area (ha)

The value of C varies based on the type and extent of impervious cover in an urban area. Higher values indicate more runoff due to less infiltration.

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Parameters
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Frequently Asked Questions
What is the Urban Runoff Coefficient?
The Urban Runoff Coefficient (C) is a dimensionless parameter used in hydrology to estimate the fraction of total rainfall that becomes surface runoff.
How do I calculate runoff volume using this coefficient?
Runoff volume (Q) can be calculated by multiplying the Urban Runoff Coefficient (C), Precipitation depth (P in mm), and Catchment area (A in ha).
What factors affect the value of C?
The value of C varies based on the type and extent of impervious cover in an urban area. Higher values indicate more runoff.
How does precipitation depth (P) influence the runoff volume?
A higher precipitation depth results in a greater volume of runoff, assuming other factors remain constant.
What is the unit for catchment area (A)?
The catchment area (A) is measured in hectares (ha).
Why is it important to consider urban runoff?
Understanding urban runoff helps manage stormwater, prevent flooding, and maintain water quality in urban environments.
Can this coefficient be used for non-urban areas?
While the Urban Runoff Coefficient is specifically designed for urban areas, similar coefficients exist for other land use types like forests or agricultural lands.

Results are for informational purposes only and do not constitute professional advice.