Water Calculations 10: Hagen-Poiseuille Equation — Flow rate in a narrow pipe is determined by the radius to the fourth power

When water flows through a narrow pipe in a steady stream, the flow rate is proportional to the fourth power of the pipe's ...

Water Calculations 24: Drip Irrigation Discharge Rate — If pressure drops by 20%, how much does the water decrease?

The amount of water coming out of the holes in a drip tube changes depending on the pressure applied to it. The way it ...