Empirical Method ( 12- 05- 2011 L: 5 )

The maximum flood discharge Q_p(m³/s) from a catchment area  A(km²)is given by the following empirical formula as

a) Dickens Formula (1865): Q_p = C_dA^3/4, where C_d Dicken’s constant (6~30).

b) Ryres Formula:  Q_p = C_RA^2/3, where C_R Ryres constant.

c) Inglis Formula (1930):  Q_p =  

 

d) Fuller’s Formula (1914): Q_TP = C_fA^0.8(1+0.8logT)

Where, Q_TP = Maximum 24hr flood with a frequency of T year in m³/s,

And C_f = constant (0.8~1.88).

e) Envelop curves Formula: