Hydrology and Ground Water

41. For an annual flood series arranged in descending order of magnitude, the return for a magnitude listed at position period'm' in a total is

1. N/(m + l)
2. m/(N + l)
3. m/N
4. (N + l)/m

View answer

42. For calculating the evaporation rate over a reservoir surface E = 0.771 (1.465 - 0.00732B) (0.44 - 0.007375 V) (p_e - p_a), the equation is given by

1. Roohwer's, formula in M.K.S.
2. Roohwer's formula in F.P.S.
3. Dalton's formula in F.P.S.
4. Dalton's formula in M.K.S.

View answer

43. For computing the run off volumes of large areas, numbers of infiltrations used are

1. 2
2. 3
3. 4
4. 5

View answer

44. For determination of average annual precipitation in a catchment basin, the best method is

1. Arithmetical method
2. Thiessen's mean method
3. Isohyetal method
4. None of these

View answer

45. For efficient working of a control meter, its throat length is approximately kept

1. Equal to the critical depth
2. Twice the critical depth
3. Three times the critical depth
4. Four times the critical depth

View answer

46. For high flood estimates the average value of the constant C in Dicken's formula Q =CA3/4, is

1. 6.5
2. 8.5
3. 9.5 (D) 11.5
4. 0.115

View answer

47. For predicting floods of a given frequency, the best reliable method is

1. Unit hydrograph method
2. Gumbel's analytical method
3. California method
4. None of these

View answer

48. For the estimate of high floods in fan-shaped catchment, the formula used is

1. Dicken's formula
2. Ryve's formula
3. Inglis formula
4. None of these

View answer

49. For the upstream face of an earthen dam, the most adverse condition for stability of slope is

1. Sudden drawdown
2. Steady seepage
3. During construction
4. Sloughing of slope

View answer

50. For wave action in dams, the maximum height of freeboard is generally taken to be equal to

1. 0.5 hw
2. 0.75 hw
3. 1.25 hw
4. 1.50 hw

View answer