The method was originally published in 1941 and its use by practitioners was recommended from 1949, then the method was revised in 1977 . The implementation in InfoDrainage is based on the description in the reference guide ‘La Ville et son assainissement’ .
The Pipe sizing method used in InfoDrainage is the same whichever flow calculation method is selected.
|This option may not be available for your region. For more information, refer to the Regionalisation topic.|
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 coefficientsare calculated using the advanced parameters according to the following equations: