Weir Flow Calculator

Weir Flow Calculator — Calculate Flow Rate Over Weirs

Calculate the flow rate over weirs for optimal hydraulic design. Determine proper flow rates based on weir type, dimensions, and hydraulic conditions for accurate water management.

Step 1: Weir Specifications

Weir Type

Weir Width (meters)

Custom Weir Width (meters)

Head Height (meters)

Understanding Weir Flow

Weirs are structures used to measure or control water flow. Flow rate depends on weir type, dimensions, and head (water height above the weir crest).

Step 2: Hydraulic Conditions

Water Type

Water Temperature (°C)

20°C

Channel Roughness Coefficient (n)

0.025

Show weir type comparison table

Show flow visualization

About Weir Flow Calculations

Flow rate calculations consider weir geometry, head height, and hydraulic conditions. Different weir types have specific discharge coefficients and flow formulas.

Weir Flow Results

Summary

Weir Comparison

Breakdown

Calculated Flow Rate

0.425 m³/s

For 2.0m triangular weir at 0.3m head

Flow Velocity

1.42 m/s

Discharge Coefficient

0.61

Weir Width

2.0 m

Weir Type

Triangular

Weir Type Flow Comparison

Weir Type	Typical Flow Range	Discharge Coefficient	Accuracy

Flow Calculation Breakdown

Flow Calculation Formula

Q = C × L × H^3/2 (for rectangular weirs)

Where: Q = Flow rate, C = Discharge coefficient, L = Weir width, H = Head height. Different weir types use modified formulas with specific coefficients.

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