# 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.