1844. The total capacity of a reservoir is 25 million cubic metres and dead storage is 5 million cubic metres. If the average volume of sediment deposition is 0.10 million cubic metre per year, then the usefulness of the reservoir will start reducing after_________________?

A. 50 years
B. 150 years
C. 200 years
D. 250 years
✅ The correct answer is option A.

1846. As compared to crest of the normal portion of the weir, the crest of the under sluice portion of weir is kept at_____________?

A. lower level
B. higher level
C. same level
D. any of the above depending on the design
✅ The correct answer is option A.

1848. For a catchment area of 120 km2, the equilibrium discharge in m3/hour of an S-curve obtained by the summation of 6 hour unit hydro graph is_______________?

A. 0.2 x 106
B. 0.6 x 106
C. 2.4 xlO6
D. 7.2 xlO6
✅ The correct answer is option A.

1850. The normal annual precipitation at stations X, A, B and C are 700 mm, 1000 mm, 900 mm and 800 mm respectively. If the storm precipitation at three station A, B and C were 100 mm, 90 mm and 80 mm respectively, then the storm precipitation for station X will be___________________?

A. 70mm
B. 80mm
C. 90 mm
D. 105 mm
✅ The correct answer is option A.