Tabla A-2: Factores de frecuencia aplicable a las distribuciones Pearson Tipo III en función del coeficiente de asimetría y el período de retorno (o probabilidad de excedencia).

Tabla A-2 Factores de frecuencia K aplicable a las distribuciones Pearson Tipo III en función
del coeficiente de asimetría C_S y el período de retorno T (o probabilidad de excedencia P).

Coeficiente
de asimetría
C_s Período de retorno T (y)

1.05 1.11 1.25 2 5 10 25 50 100 200

Probabilidad de excedencia (%)

95 90 80 50 20 10 4 2 1 0.5

3.0 -0.665 -0.660 -0.636 -0.396 0.420 1.180 2.278 3.152 4.051 4.970

2.8 -0.711 -0.702 -0.666 -0.384 0.460 1.210 2.275 3.114 3.973 4.847

2.6 -0.762 -0.747 -0.696 -0.368 0.499 1.238 2.267 3.071 3.889 4.718

2.4 -0.819 -0.795 -0.725 -0.351 0.537 1.262 2.256 3.023 3.800 4.584

2.2 -0.882 -0.844 -0.752 -0.330 0.574 1.284 2.240 2.970 3.075 4.444

2.0 -0.949 -0.895 -0.777 -0.307 0.609 1.302 2.219 2.192 3.605 4.398

1.8 -1.020 -0.945 -0.799 -0.282 0.643 1.318 2.193 2.848 3.499 4.147

1.6 -1.093 -0.994 -0.817 -0.254 0.675 1.329 2.163 2.780 3.388 3.990

1.4 -1.168 -1.041 -0.832 -0.225 0.705 1.337 2.128 2.706 3.271 3.828

1.2 -1.243 -1.086 -0.844 -0.195 0.732 1.340 2.087 2.626 3.149 3.661

1.0 -1.317 -1.128 -0.852 -0.164 0.758 1.340 2.043 2.542 3.022 3.489

0.8 -1.388 -1.166 -0.856 -0.132 0.780 1.336 1.993 2.453 2.891 3.312

0.6 -1.458 -1.200 -0.857 -0.099 0.800 1.328 1.939 2.359 2.755 3.132

0.4 -1.524 -1.231 -0.855 -0.066 0.816 1.317 1.880 2.261 2.615 2.949

0.2 -1.586 -1.258 -0.850 -0.033 0.830 1.301 1.818 2.159 2.472 2.763

0.0 -1.645 -1.282 -0.842 0.000 0.842 1.282 1.751 2.054 2.326 2.576

-0.2 -1.700 -1.301 -0.830 0.033 0.850 1.258 1.680 1.945 2.178 2.388

-0.4 -1.750 -1.317 -0.816 0.066 0.855 1.231 1.606 1.834 2.029 2.201

-0.6 -1.797 -1.328 -0.800 0.099 0.857 1.200 1.528 1.720 1.880 2.016

-0.8 -1.839 -1.336 -0.780 0.132 0.856 1.166 1.448 1.606 1.733 1.837

-1.0 -1.877 -1.340 -0.758 0.164 0.852 1.128 1.366 1.492 1.588 1.664

-1.2 -1.910 -1.340 -0.732 0.195 0.844 1.086 1.282 1.379 1.449 1.501

-1.4 -1.938 -1.337 -0.705 0.225 0.832 1.041 1.198 1.270 1.318 1.351

-1.6 -1.962 -1.329 -0.675 0.254 0.817 0.994 1.116 1.166 1.197 1.216

-1.8 -1.981 -1.318 -0.643 0.282 0.799 0.945 1.035 1.069 1.087 1.097

-2.0 -1.996 -1.302 -0.609 0.307 0.777 0.895 0.959 0.980 0.990 0.995

-2.2 -2.006 -1.284 -0.574 0.330 0.752 0.844 0.888 0.900 0.905 0.907

-2.4 -2.011 -1.262 -0.537 0.351 0.725 0.795 0.823 0.830 0.832 0.833

-2.6 -2.013 -1.238 -0.499 0.368 0.696 0.747 0.764 0.768 0.769 0.769

-2.8 -2.010 -1.210 -0.460 0.384 0.666 0.702 0.712 0.714 0.714 0.714

-3.0 -2.003 -1.180 -0.420 0.393 0.636 0.660 0.666 0.666 0.667 0.667

Fuente: U.S. Interagency Committe on Water Data, Hydrology Subcommitee (1983). "Guidelines for Determining Flood Flow Frequency," Bulletin No. 17B, issued 1981, revised 1983.

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