Deck 16: Water Management and Irrigation Systems

Question 1

The graphical representation of average rainfall and rainfall excess (i.e. rainfall minus infiltration) rates over specified areas during successive unit time intervals during a storm is known as

A)hydrograph
B)unit hydrograph
C)hyetograph
D)none of these

Answer 1

hyetograph

Question 2

The maximum depth in soil strata, in which the crop spreads its root system, and derives water from the soil, is called

A)kot depth
B)root zone depth
C)delta
D)overlap allowance

Answer 2

root zone depth

Question 3

In a canal section, which is in partial filling and partial cutting

A)the full supply level of the canal is above the natural surface level
B)the bed level of the canal is below the natural surface level
C)the full supply level of the canal is below the natural surface level
D)the bed level of the canal is above the natural surface level
E)both (a) and (b)

Answer 3

both (a) and (b)

Question 4

The free board in a channel is governed by the

A)size of the canal
B)location of the canal
C)water surface fluctuations
D)all of these

Question 5

According to Khosla's theory, the exit gradient in the absence of a downstream cut-off is

A)zero
B)unity
C)infinity
D)none of these

Question 6

Which of the following statement is wrong?

A)The impermeable groynes do not permit any flow through them.
B)The impermeable groynes may be constructed by a core of locally available material like sand, clay and gravel.
C)The permeable groynes dampen the velocity and reduce the erosive action of the stream.
D)none of the above

Question 7

Water logging takes place due to

A)rise
B)fall

Question 8

Outlet discharge for a particular crop is given by

A)Area / Outlet factor
B)Outlet factor / Area
C)Area x Outlet factor
D)none of these

Question 9

Which of the following statements is wrong?

A)Seepage drains reduce the chances of water logging.
B)The water table generally follows the ground surface above it with a few exceptions.
C)At the water table, the hydrostatic pressure is zero.
D)Water logging makes the land more productive.

Question 10

A groyne

A)contracts a river channel to improve its depth
B)silts up the area in the vicinity by creating a slack flow
C)trains the flow along a certain course
D)all of the above

Question 11

An aggrading river is a

A)scouring
B)silting

Question 12

The consumptive use of water of a crop

A)is measured as the volume of water per unit area
B)is measured as depth of water on irrigated area
C)may be supplied partly by precipitation and partly by irrigation
D)all of the above

Question 13

A deflecting groyne has a much

A)longer
B)shorter

Question 14

Which of the following method is useful for obtaining values of flood discharges for a high recurrence interval?

A)California method
B)Hazen's method
C)Gumbel's method
D)all of these

Question 15

The first watering, when the crop has grown a few centimetres, is called paleo.

Question 16

A river training work is generally required when the river is

A)aggrading type
B)degrading type
C)meandering type
D)stable type

Question 17

The narrow strip of land left at the ground level between the inner toe of the bank and top edge of the cutting, is known as

A)free board
B)dowel
C)inspection roadway
D)berm

Question 18

Run-off is measured in

A)m³/s
B)m³/min
C)m³/h
D)none of these

Question 19

Irrigation is said to be a science of survival.

Question 20

According to Lacey

A)the silt is kept in suspension due to the force of vertical eddies
B)the eddies are generated from bed and sides, both normal to the surface of generation
C)the vertical component of eddies generated from sides will also support the silt
D)all of the above

Question 21

The height of dowel above the road level should not be more than

A)10 cm
B)20 cm
C)30 cm
D)40 cm