Home
Back
Formula Used:
| From: | To: |
The Width of Throat formula calculates the required throat width for a Parshall flume based on discharge rate, coefficient of discharge, and depth of flow. This is essential for proper hydraulic design and flow measurement in open channels.
The calculator uses the formula:
Where:
Explanation: The formula calculates the throat width required to accommodate a specific discharge rate given the flow depth and discharge coefficient.
Details: Accurate throat width calculation is crucial for designing efficient Parshall flumes that provide accurate flow measurements and prevent flow constriction issues in hydraulic systems.
Tips: Enter discharge in m³/s, coefficient of discharge (typically between 0.6-0.9), and depth of flow in meters. All values must be positive numbers.
Q1: What is a Parshall flume?
A: A Parshall flume is a fixed hydraulic structure used to measure flow rate in open channels, consisting of a converging section, throat, and diverging section.
Q2: What are typical values for coefficient of discharge?
A: The coefficient of discharge typically ranges from 0.6 to 0.9, depending on the flume design and flow conditions.
Q3: Why is the depth of flow raised to the power of 1.5?
A: The exponent 1.5 comes from the critical flow relationship in open channel hydraulics, where flow transitions from subcritical to supercritical.
Q4: What are the limitations of this formula?
A: This formula assumes ideal flow conditions and may need adjustments for real-world factors like turbulence, viscosity, and channel roughness.
Q5: How accurate is this calculation?
A: The accuracy depends on the precision of input values and how well the actual conditions match the theoretical assumptions of the formula.