Question 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

Accepted Answer

A) (i) and (ii) 
B) (i),(ii) and (iii) 
C) (i), (ii) and (iv) 
D) (i), (ii), (iii) and (iv)

Question 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

Accepted Answer

A) 20 m3/sec 
B) 25 m3/sec 
C) 30 m3/sec 
D) 35 m3/sec

Question 3

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

Accepted Answer

A) demand cannot be met by inflow 
B) reservoir was not full at the beginning 
C) both (a) and (b) 
D) none of the above

Question 4

A spoil bank is formed when the

Accepted Answer

A) canal has steel bed slope 
B) canal section is too large 
C) volume of excavation is in excess of the embankment filling 
D) canal alignment is meandrous

Question 5

Which of the following methods is used to estimate flood discharge based on high water marks left over in the past ?

Accepted Answer

A) slope-area method 
B) area-velocity method 
C) moving boat method 
D) ultra-sonic method

Exam 8: Floods, Catchment, and Irrigation

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

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

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

A spoil bank is formed when the

Which of the following methods is used to estimate flood discharge based on high water marks left over in the past ?