To determine flow over a weir, input the weir length (L), head (H), and other necessary parameters into the given formula.
The Weir Flow Calculator is a valuable tool for calculating the flow rate over a rectangular, trapezoidal, or sharp-crested weir. It uses established hydrodynamic principles to measure water discharge based on weir geometry and head height. This is crucial for applications like irrigation, water resource management, and hydro-logical studies.
Formula
Q = 3.247 × L × H^1.48 − [ (.566 × L^1.9) / (1 + 2 × L^1.87) ] × H^1.9
| Variable | Description |
|---|---|
| Q | Flow rate through the weir |
| L | Length of the weir crest |
| H | Head or water height above the weir |
Solved Calculations
Example 1: Small Rectangular Weir
- Weir Length (L): 5 ft
- Head (H): 2 ft
| Step | Value |
|---|---|
| Calculate |
|
| Calculate |
|
| Subtract the second term from the first | |
| Flow Rate (Q) | 29.4 cubic feet/sec |
Example 2: Larger Weir Setup
- Weir Length (L): 10 ft
- Head (H): 3 ft
| Step | Value |
|---|---|
| Calculate |
|
| Calculate |
|
| Subtract the second term from the first | |
| Flow Rate (Q) | 72.8 cubic feet/sec |
Weir Flow Calculator – Weir Flow, Broad Crested Weir, V Notch Weir, Rectangular Weir Calculator 2025:
The Weir Flow Calculator is a practical tool used to calculate the flow rate of water over a weir. It applies specific formulas, such as the rectangular or V-notch weir equations, depending on the weir type.
These calculations are essential for accurately measuring discharge in open channels like rivers, canals, or industrial flow systems.
For instance, the calculator considers factors such as the height of water above the weir crest and the weir’s dimensions. Whether dealing with sharp-crested, broad-crested, or trapezoidal weirs, this tool delivers precise results tailored to the specific application.
This calculator is indispensable for engineers, environmental scientists, and water resource managers who need to manage flow rates, design efficient water systems, or ensure regulatory compliance.
Final Words:
In conclusion, the Weir Flow Calculator is a vital resource for accurate and efficient water flow measurement. By providing reliable data, it helps streamline hydraulic planning and ensures precise control over water systems.
