text: Since Serghidess solution was found to be one of the most accurate approximation of the implicit Colebrook–White equation, Niazkar modified the Serghidess solution to solve directly for the Darcy–Weisbach friction factor f for a full-flowing circular pipe.
  Niazkar's solution is shown in the following:
  Niazkar's solution was found to be the most accurate correlation based on a comparative analysis conducted in the literature among 42 different explicit equations for estimating Colebrook friction factor.