Deck 14: Civil Engineering Water Management

Question 1

Tortuosity of a meandering river is the ratio of

A)meander length to width of meander
B)meander length to width of river
C)curved length along the river to the direct axial length of the river
D)direct axial length of the river to the curved length along the river

Answer 1

curved length along the river to the direct axial length of the river

Question 2

For irrigation purposes, the p-H value of water should be

A)between 3 and 6
B)between 6 and 8.5
C)between 8.5 and 11
D)more than 11

Answer 2

between 6 and 8.5

Question 3

The precipitation caused by lifting of warm moisture laden air masses due to topographic barriers, is called

A)convective precipitation
B)orographic precipitation
C)cyclonic precipitation
D)none of these

Answer 3

orographic precipitation

Question 4

Which of the following is a type of non-modular outlet?

A)Submerged pipe outlet
B)Open-flume outlet
C)Kennedy's gauge outlet
D)all of these

Question 5

Flood frequency denotes the likelyhood of flood being equalled or exceeded.

Question 6

A degrading river is a scouring river.

Question 7

The water content at which plants can no-longer extract sufficient water from the soil for its growth, is called

A)field capacity
B)saturation capacity
C)permanent wilting point
D)available moisture

Question 8

Lacey gave a relation between

A)velocity and hydraulic mean depth
B)area and velocity
C)both (a) and (b)
D)none of these

Question 9

According to Khosla's theory, the critical hydraulic gradient for alluvial soils is approximately equal to

A)1
B)1.5
C)2
D)2.5

Question 10

When the bed level of the canal is higher than the highest flood level (H.F.L.) of the drainage, then the cross drainage work is said to be

A)aqueduct
B)super-passage
C)canal syphon
D)syphon aqueduct

Question 11

The floor of the aqueduct is subjected to uplift pressure due to

A)seepage of water from the canal to the drainage
B)sub-soil water table in the drainage bed
C)both (a) and (b)
D)none of the above

Question 12

When the levels are such that the F.S.L. of the canal is much above the bed level of the drainage trough, so that the canal runs under syphonic action under the trough, the structure provided is known as

A)syphon aqueduct
B)level crossing
C)canal syphon
D)super syphon

Question 13

A fall, which maintains the depth is a

A)trapezoidal notch fall
B)rectangular notch fall
C)low weir fall
D)all of these

Question 14

The soil becomes, practically, infertile if its p-H value is

A)0
B)7
C)11
D)14

Question 15

For the pipe outlet to be proportional, the outlet is set at

A)0.3 times
B)0.5 times
C)0.8 times

Question 16

In a lined canal, the resistance to flow decreases and velocity of flow increases.

Question 17

According to Lacey, a channel is said to be in regime, if

A)it flows in incoherent unlimited alluvium of the same character as that transported material
B)its discharge is constant
C)the silt grade and the silt charge are constant
D)all of the above

Question 18

Which of the following satement is correct?

A)In Lacey's silt theory, the derivation of the various formulae depends upon a single factor 'f'.
B)Lacey's equation includes a concentration of silt as variable.
C)Lacey properly define the silt grade and silt charge.
D)Lacey introduced semi-ellipse as ideal shape of a regime channel.

Question 19

Okhla weir on Yamuna river, in Delhi, is an example of

A)vertical drop weir
B)drystone slope weir
C)concrete slope weir
D)parabolic weir

Question 20

Kennedy gave a relation between

A)velocity and hydraulic mean depth
B)area and velocity
C)critical velocity and the depth of flowing water
D)all of the above

Question 21

Check flooding method of irrigation is used for

A)closed growing crops
B)tracts with flat gradients
C)crops which can stand inundation of water for sometime
D)crops such as sugarcane, potatoes etc.

Question 22

Lacey assumed that silt is kept in suspension because of the normal components of eddies generated from the

A)bed only
B)side only
C)whole perimeter
D)none of these

Question 23

In Bligh's creep theory

A)there is no distinction between horizontal and vertical creep
B)loss of head does not take place in the same proportion as creep length
C)the uplife pressure distribution is not linear, but follows a sine curve
D)all of the above

Question 24

Dicken's formula for high flood discharge is useful for catchments in

A)Southern India
B)Northern India
C)Eastern India
D)Western India

Question 25

Intensity of irrigation should be increased in order to prevent the area from water logging.