Page Information
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The method was originally published in 1941 and its use by practitioners was recommended from 1949, then the method was revised in 1977 [1]. The implementation in InfoDrainage is based on the description in the reference guide ‘La Ville et son assainissement’ [2].
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The Pipe sizing method used in InfoDrainage is the same whichever flow calculation method is selected. |
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| This option may not be available for your region. For more information, refer to the Regionalisation topic. |
The equations
The main formula used by the ‘Méthode de Caquot’ is as follow:
where I is the average slope of the catchment (m/m), C is the runoff coefficient of the catchment (generally assumed equal to the coefficient of impermeabilisation), and A is the catchment area (ha).
The coefficients 
are calculated using the advanced parameters according to the following equations:
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