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## EMPIRICAL METHODS |

With the empirical methods the maximum high flood's flow estimation depends on adopting a law regarding the probability distribution of peak flow’s annual maximum. Authors have searched for the best definition and approach.

Forti’s formula

Forti proposed two formulas for the calculation of the specific flow, or the high flood unitary contribution in m³/sec Km², for surfaces below 1000 Km², and with maximum rain in 24 h of 400 mm

and of 200-250 mm

Marchi’s formula (1939)

Valid for basins with a inferior surface to 150 Km², with maximum rain in 24 h of 400 mm. The udometric coefficient will be calculated:

Pagliaro’s formula (1936)

Valid for basins between 20 and 1000 Km², the specific high flood maximum flow is calculated:

where A represents basin’s surface and the flow is the specific one, or for the basin’s surface unit expressed in m³/sec Km².

Scimeni’s formula (1928)

Valid for basin not larger than 1000 Km², the specific high flood flow is calculated:

where A represents basin’s surface and the flow is a specific one, or for the basin’s surface unit, expressed in m³/sec Km².

Giandotti’s formula (1940)

Valid for basins non larger than 1000 Km², the specific flow is: