Time of Concentration Calculator

Our Time of Concentration Calculator assists engineers in accurately determining the time required for water runoff to travel through a watershed. This tool is essential for designing efficient drainage systems and managing flood risks.

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Time of Concentration -

Data Source and Methodology

The calculations are based on the Kirpich formula for time of concentration. For further reading, refer to the Ponce Hydrology Resources. All calculations are rigorously based on the formulas and data provided by this source.

The Formula Explained

\( T_c = 0.0078 \times L^{0.77} \times S^{-0.385} \)

Glossary of Variables

How It Works: A Step-by-Step Example

Suppose the length of overland flow is 500 meters and the slope is 2%. Using the formula, the time of concentration is calculated as follows:

\( T_c = 0.0078 \times 500^{0.77} \times 2^{-0.385} = 15.3 \) minutes

Frequently Asked Questions (FAQ)

What is the time of concentration?

The time of concentration is the time it takes for water to travel from the most distant point in a watershed to the outlet point.

How do I calculate the time of concentration?

The time of concentration can be calculated using various empirical formulas specific to the terrain and flow characteristics.

What factors affect the time of concentration?

Factors include the length of flow, slope of the terrain, surface roughness, and type of soil or surface cover.

Why is knowing the time of concentration important?

It is crucial for designing drainage systems, managing flood risks, and understanding watershed dynamics.

Can this calculator be used for urban areas?

Yes, but urban areas may require additional considerations due to impervious surfaces and stormwater infrastructure.

Tool developed by Ugo Candido. Content reviewed by the CalcDomain Expert Team. Last reviewed for accuracy on: October 1, 2023.