What is a structure built near weirs and barrages to help fish migrate upstream or downstream called?
Correct answer B. Fish ladder
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Water Management MCQs
Page 8 of Water Management multiple-choice questions with answers. Tap an option to check yourself.
Page 8 of 15
Net irrigation requirement plus field irrigation losses gives which requirement?
Correct answer D. Field irrigation
Which irrigation method surrounds each tree with a ridge so that a pool forms when water is applied?
Correct answer D. Basin irrigation
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Land with a high alkali content can be reclaimed by adding what?
Correct answer D. CaSO4
What is a unit hydrograph called when its duration approaches zero?
Correct answer A. Instantaneous unit hydrograph
What is a graph showing river flow against time called?
Correct answer D. Hydrograph
What is the combined loss of water by evaporation from water and soil surfaces and by transpiration from plants called?
Correct answer B. Evapotranspiration
Where does the centre of pressure of a submerged plane surface lie?
Correct answer A. Always below the centre of gravity of the area
The useful life of a reservoir is usually considered over when its gross storage has fallen by what fraction of the design capacity?
Correct answer D. 80%
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In which type of weir are aeration holes provided to relieve the reduced pressure beneath the nappe?
Correct answer C. In a suppressed weir
Which of these devices has the highest coefficient of discharge?
Correct answer B. Venturi meter
Which device directly measures the mean velocity of flow in a river?
Correct answer A. Rod floats
What is a passage or tunnel made in rock or a dam to collect seepage water called?
Correct answer C. Seepage gallery
In a flow net, what are the lines showing the direction of water flow through the soil beneath a dam called?
Correct answer D. Flow lines
What is the unobstructed distance over a water surface along which wind can travel and raise waves called?
Correct answer B. Fetch
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What is the ratio, expressed as a percentage, of the volume of water in the voids to the total volume of voids in a soil called?
Correct answer D. Degree of saturation
What is a pile called that is driven into soft soil, does not reach hard rock and carries its load through side resistance?
Correct answer B. Friction pile
In levelling, what is a reference point on the ground whose position is accurately known called?
Correct answer C. Control point
What is a line drawn on a map joining points of equal level or head called?
Correct answer C. Contour line
What is the water lost by transpiration from crops plus evaporation from the adjacent soil called?
Correct answer D. A & B are correct