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 ( $Q$ ) based on the water height ( $y$ ) and throat width ( $W$ ).
Determine the water height ( $y$ ) for a given flow rate ( $Q$ ) and throat width ( $W$ ).

Parshall flume

Input and Output Parameters

Parameter	Default Units	Description
Throat width (W)	inches	Width of the narrowest part of the flume
Water height (y)	meters	Water level height in the flume
Flow (Q)	$m^3/s$	Water flow through the flume
A, B, C, D, E, F, G, K, N	meters	Specific geometric dimensions of the flume

References

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

Calculations