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Annual maxima rainfall is used in frequency analysis for hydrological design purposes....
Annual maxima rainfall is used in frequency analysis for hydrological design purposes. Table 1 shows the annual maxima of 1-hour rainfall duration from year 1985 until 2005 that has been processed from rainfall records of a catchment. Table 2 shows the different land use types and the corresponding area in hectare (ha) of the catchment. The IDF curve for the catchment has constant values as given in Table 3. Answer the following questions: Table 1 Year Year Rainfall intensity (mm/hr) 64.8 768 643 58.4 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 Rainfall intensity (mm/hr) 52.2 61.6 64.2 53.4 31.3 58.2 64.1 94.7 59.2 71.2 96.2 1996 1997 1998 1999 20.00 2001 20X2 2013 2004 2005 323 51.8 83.9 57.0 40.7 Table 2 Land use Area (ha) Roads Lawn Residential area Forest land Runoff coefficient, с 0.85 0.2 0.75 0.4 8 10 43 10 Table 3 IDF Parameter 2 k 0 Value 64.504 0.196 0.149 0.723 a) Find the rainfall intensity corresponding to a probability of exceedance of 0.01 using the Gumbel's method.