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- Manning_formula abstract "The Manning formula is also known as the Gauckler–Manning formula, or Gauckler–Manning–Strickler formula in Europe. In the United States, in practice, it is very frequently called simply Manning's Equation. The Manning formula is an empirical formula estimating the average velocity of a liquid flowing in a conduit that does not completely enclose the liquid, i.e., open channel flow. All flow in so-called open channels is driven by gravity. It was first presented by the French engineer Philippe Gauckler in 1867, and later re-developed by the Irish engineer Robert Manning in 1890.The Gauckler–Manning formula states:where: V is the cross-sectional average velocity (L/T; ft/s, m/s); k is a conversion factor of (L1/3/T), 1 m1/3/s for SI, or 1.4859 ft1/3/s U.S. customary units, if required. (Note: (1 m)1/3/s = (3.2808399 ft) 1/3/s = 1.4859 ft1/3/s); n is the Gauckler–Manning coefficient, it is unitless; Rh is the hydraulic radius (L; ft, m); S is the slope of the hydraulic grade line or the linear hydraulic head loss (L/L), which is the same as the channel bed slope when the water depth is constant. (S = hf/L).NOTE: Ks strickler = 1/n manning. The coefficient Ks strickler varies from 20 (rough stone and rough surface) to 80 m1/3/s (smooth concrete and cast iron).The discharge formula, Q = A V, can be used to manipulate Gauckler–Manning's equation by substitution for V. Solving for Q then allows an estimate of the volumetric flow rate (discharge) without knowing the limiting or actual flow velocity.The Gauckler–Manning formula is used to estimate the average velocity of water flowing in an open channel in locations where it is not practical to construct a weir or flume to measure flow with greater accuracy. The friction coefficients across weirs and orifices are less subjective than n along a natural (earthen, stone or vegetated) channel reach. Cross sectional area, as well as n', will likely vary along a natural channel. Accordingly, more error is expected in estimating the average velocity by assuming a Manning's n, than by direct sampling (i.e., with a current flowmeter), or measuring it across weirs, flumes or orifices. Manning's equation is also commonly used as part of a numerical step method, such as the Standard Step Method, for delineating the free surface profile of water flowing in an open channel.The formula can be obtained by use of dimensional analysis. Recently this formula was derived theoretically using the phenomenological theory of turbulence.".
- Manning_formula wikiPageExternalLink manning.sdsu.edu.
- Manning_formula wikiPageExternalLink hydraulic_radius_equation.php.
- Manning_formula wikiPageExternalLink Manning_Equation_Flow_Generator.htm.
- Manning_formula wikiPageExternalLink Mannings_n_Tables.htm.
- Manning_formula wikiPageExternalLink Mannings.exe.
- Manning_formula wikiPageExternalLink index.htm.
- Manning_formula wikiPageID "2235142".
- Manning_formula wikiPageRevisionID "585604050".
- Manning_formula hasPhotoCollection Manning_formula.
- Manning_formula subject Category:Fluid_dynamics.
- Manning_formula subject Category:Geomorphology.
- Manning_formula subject Category:Hydraulic_engineering.
- Manning_formula subject Category:Hydrology.
- Manning_formula subject Category:Piping.
- Manning_formula subject Category:Sedimentology.
- Manning_formula comment "The Manning formula is also known as the Gauckler–Manning formula, or Gauckler–Manning–Strickler formula in Europe. In the United States, in practice, it is very frequently called simply Manning's Equation. The Manning formula is an empirical formula estimating the average velocity of a liquid flowing in a conduit that does not completely enclose the liquid, i.e., open channel flow. All flow in so-called open channels is driven by gravity.".
- Manning_formula label "Fließformel".
- Manning_formula label "Fórmula de Manning".
- Manning_formula label "Fórmula de Manning".
- Manning_formula label "Manning formula".
- Manning_formula label "Формула Маннинга".
- Manning_formula label "マニング公式".
- Manning_formula label "曼寧公式".
- Manning_formula sameAs Manningova_rovnice.
- Manning_formula sameAs Fließformel.
- Manning_formula sameAs Fórmula_de_Manning.
- Manning_formula sameAs マニング公式.
- Manning_formula sameAs Fórmula_de_Manning.
- Manning_formula sameAs m.06y3kv.
- Manning_formula sameAs Q1428692.
- Manning_formula sameAs Q1428692.
- Manning_formula wasDerivedFrom Manning_formula?oldid=585604050.
- Manning_formula isPrimaryTopicOf Manning_formula.