11.The maximum rainfall depth of 300 mm in 24 hours has a return period of 100 years. The probability of 24 hours rainfall equal to or greater than 300 mm occurring at least once in 10 years is given by

12.A river training work is generally required when the river is

13.Lining of irrigation channels

14.Interception losses are due to i) evaporation ii) transpiration iii) stream flow The correct answer is

15.The most suitable chemical which can be applied to the water surface for reducing evaporation is