# What is gpm on a calculator?

## What is gpm on a calculator?

Gallons per Minute

## How do you calculate critical flow?

Calculations for a Trapezoidal Channel For a channel with a trapezoidal cross section, the critical flow condition is given by Fr = Vc/[g(A/B)c]1/2 = 1, where Ac = yc(b + zyc) and Bc = b + zyc2 , where z is the trapezoidal channel side slope (H:V = z:1).

## What does critical flow mean?

critical flow Critical flow occurs when the flow velocity in a channel equals the wave velocity generated by a disturbance or obstruction. In this condition the Froude number (Fr) = 1. When Fr is greater than 1 waves cannot be generated upstream and the flow is said to be supercritical, rapid, or shooting.

## What is critical depth of flow?

Critical depth is defined as the depth of flow where energy is at a minimum for a particular discharge. Flow profiles are classified by the slope of the channel (So), yn, and yc.

## What does Froude number tell you?

The Froude Number is a dimensionless parameter measuring the ratio of “the inertia force on a element of fluid to the weight of the fluid element” – the inertial force divided by gravitational force. A Froude number of 1 defines critical mean depth vs. critical velocity.

## What causes choked flow?

Choked flow is a fluid dynamic condition associated with the venturi effect. When a flowing fluid at a given pressure and temperature passes through a constriction (such as the throat of a convergent-divergent nozzle or a valve in a pipe) into a lower pressure environment the fluid velocity increases.