Head Loss (friction)

Head is a measurement of energy in a fluid expressed in feet.  The fluid can posses energy based on factors such as elevation, pressure, or velocity.  As the fluid flows through pipes there is loss of this energy due to forces such as friction, turbulence, and diameter of the pipe.  This equation calculates Head loss and takes as input a friction factor.  The friction factor is based on equations of Laminar Flow and is generally looked up in charts based on pipe characteristics.  The answer is rounded to 4 decimal places precision.