The Manning formula is used to calculate the flow of water through pipes. Sometimes, it may be referred to as the Manning equation or the Manning-Bedient equation. Other synonyms for the term include the Manning-Strickler equation, Manning's roughness coefficient formula, and the Hazen-Williams-Manning formula. The formula was developed by Robert Manning, an Irish engineer, in the mid-1800s. It is still widely used in civil engineering for designing drainage systems, sewers, and water supply systems. In essence, the Manning formula helps engineers estimate the flow rate of water through a pipe, which is crucial in designing and maintaining water systems.