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Hydrology-Irrigation : Nuclear Quiz 3

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Question 1

The probability that a 100 year flood is equalled or exceeded at once in 100 year is

Question 2

A tile drainage system draining 12 ha flows at the design capacity for two days in response to a storm. If the system is designed with a drainage coefficient of 1.25 cm/day, then the amount of water removed from the drainage area during two days is _________m3.

Question 3

For a discharge of 2.01 m3/s and silt factor f = 0.85 using Lacey’s theory, the velocity is

Question 4

A catchment of area 100 ha received a rainfall of 10 cm in 2 h due to storm. At the outlet of the catchment, the stream draining the catchment was dry before the storm and experienced a runoff lasting for 8 h with an average discharge value of 2 m3/s. the stream was again dry after the runoff event. What is the loss of water?

Question 5

The leaching requirement of a soil is 10%. If the consumptive use requirement of the crop is 90 mm, then the depth of water required to be applied to the field is

Question 6

The peak of flood hydrograph due to a 3 hr duration isolated-storm in a catchment is 270 m3/sec. The total depth of rainfall is 5.9 cm. Assume an average infiltration loss of 0.3 cm/hr, a constant base flow of 20m3/s and the area of the catchment is 540km2. The base width of 3hr unit hydrograph by assuming it to be triangular in shape is____.

Question 7

A firm was supplied water from irrigation tank at a rate of 100 L/s to irrigate an area of 5.0 ha. The duration of irrigation is 10 h. it was found that the actual delivery at the field which is about 10 km from the tank, was 80 L/s. the runoff loss in the field was estimated 1000 m3. The water application efficiency in this situation is

Question 8

Consider the following weir floor on a permeable soil. The ratio of creep length according to lane’s creep theory to Bligh’s ereep theory is

Question 9

During the receding of a flood event the prism storage and  it is the volume that would exist if the uniform flow occurred at the downstream depth. i.e., the volume formed by an imaginary plane parallel to the channel bottom drawn at the outflow section water surface.

Question 10

The piezometric head at bottom of floor is 15m and the datum is 3m below the floor bottom. The standing water depth above the floor is 2m. What is the floor thickness considering the specific gravity of the material as 2.5?
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Jun 27ESE & GATE CE