Frequency analysis of consecutive days maximum rainfall at Banswara, Rajasthan India (original) (raw)

2006, ARPN J. Eng. Appl. …

Annual one day maximum rainfall and two to five days consecutive days maximum rainfall corresponding to return period varying from 2 to 100 years are used by design engineers and hydrologists for the economic planning, design of small and medium hydrologic structures and determination of drainage coefficient for agricultural fields. A maximum of 154.31mm in 1 day, 250.88mm in 2 days, 270.15mm in 3 days, 284.18mm in 4 days and 295.54mm in 5 days is expected to occur at Udaipur, Rajasthan every 2 years. For a recurrence interval of 100 years, the maximum rainfall expected in 1 day, 2, 3, 4 and 5 days is 773.6mm, 849.34mm, 874.19mm, 931.78mm and 957.89mm, respectively. The magnitudes of 1 day as well as 2 to 5 consecutive days annual maximum rainfall corresponding to 2 to 100 years return period were estimated using Gamma function. Various probability distributions and Transformations can be applied to estimate one day and two to five consecutive days annual maximum rainfall of various return periods. Three commonly used probability distributions (viz: Normal, Log Normal and Gamma distribution) were tested by comparing the Chi-square value. Gamma distribution was found to be best fit for the region.