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WorksheetsDay 50-Nov 11-worksheet-Diploma-Hydrograph contd. & stream flow
Total questions: 15
Worksheet time: 10mins
To derive a Unit Hydrograph (UH), the Direct Runoff Hydrograph (DRH) is obtained by:
Adding base flow to flood hydrograph
Subtracting base flow from flood hydrograph
Dividing hydrograph by rainfall excess
Adding infiltration losses to flood hydrograph
In the Superposition method, the total time base of the nD-hour UH is:
nD + tB
(n - 1)D + tB
D + tB
n(D + tB)
The S-curve method is used when:
n is an integer
n is not an integer
Duration D increases
Rainfall excess is unknown
In deep streams (depth greater than 3 m), mean velocity is best obtained using:
One point method
Two point method
Three point method
Float method
A rating curve represents the relation between stage and discharge.
True
False
Ephemeral streams flow throughout the year.
True
False
Assertion (A): In reservoir routing, the peak outflow is always larger than the peak inflow. Reason (R): Storage in the reservoir reduces and delays the flood peak. Choose the correct option:
Both A and R are true and R explains A
Both A and R are true but R does not explain A
A true, R false
A false, R true
The S-curve is formed by lagging the ______ hour Unit Hydrograph repeatedly.
D hour Unit Hydrograph
1-hour Unit Hydrograph
3-hour Unit Hydrograph
6-hour Unit Hydrograph
In a staff gauge, stage is read from a fixed ______ scale.
graduated
moving
random
digital
In the one point method, mean velocity is taken at (a) times the depth.
Shifting control occurs when the stage–discharge relation changes with time.
True
False
The reduction in peak of the outflow hydrograph is known as (a) .
A Pitot tube in water shows a head difference of 0.15 m. Coefficient C = 0.98. Acceleration due to gravity g = 9.81 m/s². Find the velocity.
(a)
An orifice of area 0.0002 square meters discharges under a head of 0.90 meters. Coefficient of discharge Cd = 0.62. Find the discharge Q.
(a)
What is the main condition required for the use of dilution technique for streamflow measurement?
Steady flow
Uniform flow
Incompressible flow
Irrotational flow
