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Proportionate Velocity Formula:
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Proportionate Velocity is the ratio of velocity when water is partially full to velocity when water is totally full in a sewer system. It helps in understanding flow characteristics under different filling conditions.
The calculator uses the Proportionate Velocity formula:
Where:
Explanation: The formula calculates the ratio between flow velocity in partially filled conditions and fully filled conditions, providing insights into flow efficiency.
Details: Calculating proportionate velocity is essential for sewer system design, flow capacity analysis, and understanding how flow characteristics change with different fill levels in drainage systems.
Tips: Enter both velocity values in m/s. Ensure values are positive and valid for accurate calculation of the proportionate velocity ratio.
Q1: What does a Pv value of 1 indicate?
A: A Pv value of 1 indicates that the flow velocity in partially filled conditions is equal to the velocity in fully filled conditions.
Q2: When is Pv typically less than 1?
A: Pv is typically less than 1 in most sewer systems as flow velocity decreases when the pipe is not completely full due to increased friction and reduced hydraulic radius.
Q3: Can Pv be greater than 1?
A: In certain conditions with specific pipe geometries and flow regimes, Pv can exceed 1, though this is less common in standard sewer designs.
Q4: How does this relate to sewer design?
A: Understanding Pv helps engineers design sewer systems that maintain adequate flow velocities under various filling conditions to prevent sedimentation.
Q5: What factors influence Vs and V values?
A: Pipe slope, roughness, diameter, and flow rate are the main factors influencing both partially full and fully full velocity values.