MANNING FORMULA-A MISNOMER?

NO ONE EVER PROPOSED THE POPULAR MANNING FORMULA IN THE FORM COMMONLY USED TODAY. AT LEAST TEN PAPERS, BEGINNING WITH THAT OF GAUCKLER IN 1867, OFFERED A MONOMIAL EQUATION. MANNING'S PAPER, 1891, WAS THE FIFTH, CHRONOLOGICALLY, IN THIS GROUP OF PAPERS. THE FRENCHMAN FLAMANT IS PRIMARILY RESPONSIBLE FOR FIRST ATTRIBUTING THE FORMULA TO MANNING AND FOR INTRODUCING THE RESISTANCE COEFFICIENT. H.T. BOVEY IS KNOWN TO HAVE BEEN, IN 1901, THE FIRST TO WRITE THE EQUATION IN THE FORM USED TODAY FOR ENGLISH UNITS. THE EXPRESSION "MANNING'S RESISTANCE COEFFICIENT" FIRST CREPT INTO THE LITERATURE IN 1961 AND REPRESETNED A RATHER IRONIC DEVELOPMENT, AS MANNING HAD CLEARLY REJECTED THE USE OF THE RESISTANCE COEFFICIENT. /ASCE/

• Supplemental Notes:
  • Vol 96, No HY1, PP 193-200, 35 REF, 1 APP
• Authors:
  • Williams, G P
• Publication Date: 1970-1

Media Info

• Serial:
  • Journal of the Hydraulics Division
  • Publisher: American Society of Civil Engineers

Subject/Index Terms

• TRT Terms: Channel flow; Flow; Fluid dynamics; Hydraulics; Manning requirements; Streamflow; Water
• Uncontrolled Terms: Fluid flow; Open channel flow
• Subject Areas: Highways; Hydraulics and Hydrology;

Filing Info

• Accession Number: 00204265
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 20 1970 12:00AM