1. What is Bazin's Formula Without Velocity of Approach?

Bazin's formula is used to calculate the length of weir notches for discharge measurement in open channel flow. This version of the formula does not account for approach velocity, making it suitable for standard weir calculations where approach velocity is negligible.

2. How Does the Calculator Work?

The calculator uses Bazin's formula:

Where:

• \( Ln \) — Length of notches (m)
• \( Q \) — Discharge over weir (m³/s)
• \( la \) — Arc length of circle (m)
• \( g \) — Gravitational acceleration (9.80665 m/s²)

Explanation: The formula calculates the required length of weir notches based on discharge rate and arc length, using empirical coefficients developed by Bazin.

3. Importance of Weir Length Calculation

Details: Accurate weir length calculation is essential for proper hydraulic design, flow measurement accuracy, and efficient water management in channels and rivers.

4. Using the Calculator

Tips: Enter discharge in m³/s and arc length in meters. Both values must be positive numbers for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: When should Bazin's formula be used?
A: Bazin's formula is appropriate for standard rectangular weirs where approach velocity is negligible and for preliminary hydraulic calculations.

Q2: What are the limitations of this formula?
A: This formula doesn't account for approach velocity, so it may be less accurate in situations where approach velocity is significant.

Q3: How accurate is Bazin's formula?
A: Bazin's formula provides good accuracy for standard weir designs but should be verified with experimental data for critical applications.

Q4: Can this formula be used for all weir types?
A: This specific formula is designed for rectangular weirs. Different formulas exist for other weir types like triangular or trapezoidal weirs.

Q5: What units should be used for input values?
A: Discharge should be in cubic meters per second (m³/s) and arc length in meters (m) for consistent results.