The Méthode des Pluies approach is commonly used in France to estimate the storage volume needed in a Stormwater Control. Although this is a simple method, it is useful for preliminary studies.
It provides a way of determining the storage requirement based on an inflow curve and a set discharge rate. The inflow is determined based on the rainfall intensity that lands on a specified area (user specified or taken from the Plan). The Rainfall Intensity is derived from the Montana Coefficients as per the Desbordes Rainfall specified by the user. The discharge rate is a constant rate specified by the user.
The Methode des Pluies calculator is divided into an Input and a Results section.
The Input section has the following parameters:
Note that the results section is updated as input values are changed, so long as the inputs values are legal; if any input values are illegal then results are not displayed with the illegal values highlighted by a red triangle and associated warning.
The Results section consists of: