Tb 252TP

and the peak by

where the constant 2.2 depends on the units and on the constraint that the area of the triangle should represent a certain volume of effective rainfall. The standard value of 2.2 is for 10 mm of effective rainfall and for a discharge defined in m3 s-1 over a catchment area of 100 km2. Thus, more generally, for an effective rainfall of Ref mm and a catchment area of A km2, qp in m3 s-1 would be given by

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