1.To estimate the magnitude of a flood with a return period of T years, Gumbel's distribution method requires the following data pertaining to annual flood series i) mean value ii) standard deviation iii) length of record iv) coefficient of skew The correct answer is

2.The peak of a 4 hour flood hydrograph is 240 m3/sec . If the rainfall excess is 80 mm and base flow which is constant is 40 m3/sec, then the peak of 4-hours unit hydrograph will be

3.Instantaneous unit hydrograph is a hydrograph of i) unit duration ii) unit rainfall excess iii) infinitely small duration iv) infinitely small rainfall excess The correct answer is

4.If the risk of a flood occurring in the next 10 years is accepted to 10%, then the return period for design should be

5.If the demand line drawn from a ridge in a flow mass curve does not intersect the curve again, it indicates that