Deck 13: Canal Design, Hydrology, and Irrigation Methods

Question 1

Garret's diagram gives the graphical method of designing a channel based on

A)Lacey's theory
B)Gibb's theory
C)Kennedy's theory
D)Khosla's theory

Answer 1

Kennedy's theory

Question 2

The fall which can be used as a meter fall, is

A)vertical drop fall
B)flumed glacis fall
C)unflumed glacis fall
D)none of these

Answer 2

vertical drop fall

Question 3

A canal aligned roughly at right angles to the contours of the country is called ridge canal.

Answer 3

False

Question 4

According to Fanning's formula, the flood discharge (Q) in cumecs is given by

A)Q = CA^2/3
B)Q = CA^3/4
C)Q = CA^5/6
D)Q = CA^7/8

Question 5

Super-fluous water is also called

A)capillary water
B)gravitational water
C)hygroscopic water
D)all of these

Question 6

The hydrology is a science which deals with the

A)occurrence of water on the earth
B)distribution of water on the earth
C)movement of water on the earth
D)all of these

Question 7

The ratio between the depths of water levels over crest on the downstream and upstream of the module, is known as

A)flexibility
B)sensitivity
C)drowning ratio
D)module ratio

Question 8

The duty of irrigation water will be less if

A)area irrigated is more
B)water supply required is less
C)water supply required is more
D)none of these

Question 9

The width and length of mender as well as width of river, vary approximately with

A)discharge
B)square of discharge
C)square root of discharge
D)cube root of discharge

Question 10

In the case of a proportional outlet, the setting is equal to the ratio of outlet index to the channel index.

Question 11

The cylinder or well fall is quite suitable and economical for

A)low discharges and low drops
B)low discharges and high drops
C)high discharges and low drops
D)high discharges and high drops

Question 12

The setting of an outlet is defined as the ratio of the

A)rate of change of discharge of an outlet to the rate of change of discharge of the distributing channel
B)rate of change of discharge of an outlet to the rate of change in level of the distributing surface, referred to normal depth of the channel
C)depth of the sill or the crest level of the module below the full supply of the distributing channel to the full supply depth of the distributing channel
D)head recovered to the head put in an outlet

Question 13

A sudden fall of level of ground along the alignment of a canal joined by an inclined bed is called a

A)rapid fall
B)cylinder fall
C)sudden fall
D)hydraulic jump

Question 14

Capillary water is a useful soil moisture for the growth of plants.

Question 15

The area in which crop is grown at a particular time or crop season, is called

A)gross commanded area
B)culturable commanded area
C)culturable uncultivated area
D)none of these

Question 16

The standard height of a standard rain gauge is

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

Question 17

The saturation gradient in an ordinary loam soil is

A)1 ; 1
B)2 ; 1
C)3 ; 1
D)4 ; 1

Question 18

The field capacity of a soil depends upon

A)capillary tension in soil
B)porosity of soil
C)either (a) or (b)
D)both (a) and (b)

Question 19

For the repairing of an old but sound concrete lining, the lining preferred is

A)shotcrete lining
B)precast concrete lining
C)soil cement lining
D)sodium carbonate lining

Question 20

The term balancing depth has the same meaning as the depth of water in canal.

Question 21

When the critical velocity ratio is less than one, the channel is said to be in silting.

Question 22

For potato, sugarcane and groundnut, the furrow method of irrigation is adopted.

Question 23

Where steep land is available, the method of irrigation adopted is

A)free flooding
B)border flooding
C)check flooding
D)basin flooding

Question 24

A channel is said to be in scouring when the critical velocity ratio is

A)equal to
B)less than
C)greater than

Question 25

In case of small channels, the borrow pits should start from a distance not less than

A)2 m
B)3 m
C)4 m
D)5 m