Calha Parshall
Flow
Water height

Input data

Throat width

Water height

Output data

Flow

A

B

C

D

E

F

G

K

N

Description

The Parshall flume is a hydraulic structure widely used to measure water flow in open channels. This calculation method allows the design and evaluation of Parshall flumes under various flow conditions.

 

With the Parshall flume calculation tool, the following operations can be performed:

  • Calculate the flow rate (QQ) based on the water height (yy) and throat width (WW).
  • Determine the water height (yy) for a given flow rate (QQ) and throat width (WW).

Parshall flume

Input and Output Parameters

ParameterDefault UnitsDescription
Throat width (W)inchesWidth of the narrowest part of the flume
Water height (y)metersWater level height in the flume
Flow (Q)m3/sm^3/sWater flow through the flume
A, B, C, D, E, F, G, K, NmetersSpecific geometric dimensions of the flume

References

  • AZEVEDO NETTO, J. M. de; FERNANDEZ Y FERNANDEZ, Miguel. Manual de hidráulica, 9.ed. São Paulo: Blucher, 2015.