Rectangular Weir Flow Rate Calculator

What is a Rectangular Weir Flow Rate Calculator?

A Rectangular Weir Flow Rate Calculator is a tool used to estimate the flow rate (discharge) of water over a rectangular weir. A rectangular weir is a notched barrier placed in an open channel to measure the flow of water. The calculator uses the weir’s dimensions and water head (height of water above the weir crest) to determine the discharge rate.

Why Use a Rectangular Weir Flow Rate Calculator?

1. Accurate Water Flow Measurement – It provides an easy way to determine discharge in open channels, which is useful for irrigation, hydrology, and wastewater treatment.
2. Efficiency in Hydraulics & Engineering – Engineers use it to design and monitor drainage systems, canals, and reservoirs.
3. Compliance with Water Regulations – Many industries and water authorities require flow measurement to comply with environmental laws.
4. Quick and Reliable Calculations – Eliminates the need for complex manual calculations while ensuring accuracy.

How to Use a Rectangular Weir Flow Rate Calculator

1. Input Weir Dimensions:
   • Weir Length (L) – The width of the rectangular opening.
   • Water Head (H) – The vertical height of water above the weir crest.
2. Select the Discharge Coefficient (C_d):
   • This depends on whether the weir is suppressed (spanning the full width of the channel) or contracted (not spanning the full width).
3. Calculate Flow Rate (Q):
   • The calculator applies the appropriate formula and displays the discharge rate in cubic meters per second (m³/s) or cubic feet per second (cfs).

When to Use a Rectangular Weir Flow Rate Calculator

1. Irrigation & Drainage Management – To measure water flow in agricultural canals.
2. Hydrology & River Studies – To estimate flow rates in natural streams and rivers.
3. Water Treatment & Sewage Systems – To regulate and monitor wastewater discharge.
4. Dam and Reservoir Monitoring – To manage water levels efficiently.
5. Industrial Applications – For factories that discharge water into municipal systems.