text: The Darcy-Weisbach's accuracy and universal applicability makes it the ideal formula for flow in pipes. The advantages of the equation are as follows:
  * It is based on fundamentals.
  * It is dimensionally consistent.
  * It is useful for any fluid, including oil, gas, brine, and sludges.
  * It can be derived analytically in the laminar flow region.
  * It is useful in the transition region between laminar flow and fully developed turbulent flow.
  * The friction factor variation is well documented.