# Manning equation

From AMS Glossary

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− | <div class="definition"><div class="short_definition">An equation relating the [[mean velocity]] of flow to channel characteristics.</div><br/> <div class="paragraph">It is expressed as <div class="display-formula"><blockquote>[[File:ams2001glos-Me4.gif|link=|center|ams2001glos-Me4]]</blockquote></div> where, at a given section, ''V'' is mean velocity, ''n'' is the Manning's [[roughness coefficient]] (indicative of the [[resistance]] to the flow), ''S''<sub>''f''</sub> is the [[gradient]] of the [[total head line]], and ''R'' is the [[hydraulic radius]].</div><br/> </div> | + | <div class="definition"><div class="short_definition">An equation relating the [[mean velocity]] of flow to channel characteristics.</div><br/> <div class="paragraph">It is expressed as <div class="display-formula"><blockquote>[[File:ams2001glos-Me4.gif|link=|center|ams2001glos-Me4]]</blockquote></div> where, at a given section, ''V'' is mean velocity, ''n'' is the Manning's [[roughness coefficient]] (indicative of the [[resistance]] to the flow), ''S''<sub>''f''</sub> is the [[gradient]] of the [[total head line]], and ''R'' is the [[hydraulic radius|hydraulic radius]].</div><br/> </div> |

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## Latest revision as of 19:22, 25 April 2012

## Manning equation

An equation relating the mean velocity of flow to channel characteristics.

It is expressed as where, at a given section,

*V*is mean velocity,*n*is the Manning's roughness coefficient (indicative of the resistance to the flow),*S*_{f}is the gradient of the total head line, and*R*is the hydraulic radius.