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The Papadaskis-Kazen equation is a method used for estimating the time of concentration in hydrologic calculations. It's particularly useful for preliminary sizing of stormwater management systems and drainage design. The time of concentration is an important parameter in determining the peak flow rates for various design storms.
The Papadaskis-Kazen equation is given by:
\[ Tc = 0.0028 \times L^0.77 \times S^{-0.385} \times N^{-0.2} \]
Where:
- \( Tc \) is the time of concentration in minutes.
- \( L \) is the flow path length in feet (or meters).
- \( S \) is the slope of the flow path (dimensionless, but it's usually calculated as a ratio of vertical drop to horizontal distance).
- \( N \) is the Manning's roughness coefficient (also dimensionless).
Here's how you can use the Papadaskis-Kazen equation for preliminary sizing:
1. **Determine Flow Path Length \( L \)**:
Measure the length of the flow path that rainwater would travel from the farthest point to the outlet point.
2. **Calculate Slope \( S \)**:
Calculate the slope of the flow path, typically expressed as the ratio of vertical drop to horizontal distance.
3. **Select Manning's Roughness Coefficient \( N \)**:
The Manning's roughness coefficient depends on the surface and channel characteristics. For example, a grassy field might have a different \( N \) value compared to a paved street. Consult engineering references or guidelines to estimate the appropriate \( N \) value for your specific situation.
4. **Plug Values into the Equation**:
Plug the values of \( L \), \( S \), and \( N \) into the Papadaskis-Kazen equation to calculate the time of concentration (\( Tc \)). https://krowddarden.one