Hydrographs - 1 | 10 Questions MCQ Test

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This mock test of Hydrographs - 1 for Civil Engineering (CE) helps you for every Civil Engineering (CE) entrance exam. This contains 10 Multiple Choice Questions for Civil Engineering (CE) Hydrographs - 1 (mcq) to study with solutions a complete question bank. The solved questions answers in this Hydrographs - 1 quiz give you a good mix of easy questions and tough questions. Civil Engineering (CE) students definitely take this Hydrographs - 1 exercise for a better result in the exam. You can find other Hydrographs - 1 extra questions, long questions & short questions for Civil Engineering (CE) on EduRev as well by searching above.

QUESTION: 1

The recession limb of a flood hydrograph can be expressed with positive values of coefficients, as Q_t/Q₀ =

A.
B.
C.
e^-at
D.

Solution:

Barnes showed that recession limp of a flood hydrograph can be expressed as,

where a = -In k_r
k_r is recession constant of value less than unity. Q₀ and Q_t are discharges at a time interval of t days with Q₀ being the initial discharge.

QUESTION: 2

For a given storm, other factors remaining same,

A.
basins having low drainage density give smaller peaks in flood hydrographs
B.
basins with larger drainage densities give smaller flood peaks
C.
low drainage density basins give shorter time bases of hydrographs
D.
the flood peak is independent of the drainage density

Solution:

The drainage density is defined as the ratio of the total channel length to the total drainage area. A large drainage density creates situation conductive for quick disposal of runoff drawn the channels.

QUESTION: 3

Base-flow separation is performed

A.
on a unit hydrograph to get the direct-runoff hydrograph
B.
on a flood hydrograph to obtain the magnitude of effective rainfall
C.
on flood hydrographs to obtain the rainfall hydrograph
D.
on hydrographs of effluent streams only

Solution:

QUESTION: 4

A unit hydrograph has

A.
one unit of peak discharge
B.
one unit of rainfall duration
C.
one unit of direct runoff
D.
one unit of the time base of direct runoff

Solution:

QUESTION: 5

The basic assumptions of the unit-hydrograph theory are

A.
nonlinear response and time invariance
B.
time invariance and linear response
C.
linear response and linear time variance
D.
nonlinear time variance and linear response

Solution:

QUESTION: 6

The D-hour unit hydrograph of a catchment may be obtained by dividing the ordinates of a single peak Direct Runoff Hydrograph (DRH) due to a storm of D-hour duration by the

A.
Total runoff volume (in cm)
B.
Direct runoff volume (in cm)
C.
Duration of DRH
D.
Total rainfall (in cm)

Solution:

QUESTION: 7

A triangular DRH due to a storm has a time base of 80 hrs and a peak flow of 50 m³/s occurring at 20 hours from the start, if the catchment area is 144 km², the rainfall excess in the storm was

A.
20 cm
B.
7.2 cm
C.
5 cm
D.
None of these

Solution:

QUESTION: 8

A 12-hr unit hydrograph of a catchment is triangular in shape with a base width of 144 hours and a peak discharge value of 23 m³/s. This unit hydrograph refers to a catchment of area

A.
756 km²
B.
596 km²
C.
1000 km²
D.
None of these

Solution:

Unit hydrograph refers to 1 cm of rainfall excess
∴ Let area of catchment = A(km²)

QUESTION: 9

A 90 km² catchment has a 4-h unit hydrograph which can be approximated as a triangle. If the peak ordinate of this unit hydrograph is 10m³/s the time base is

A.
120h
B.
64 h
C.
50 h
D.
None of these

Solution:

Let the time base = B(hours)

QUESTION: 10

A triangular DRH due to a 6-h storm in a catchment has a time base of 100 h and a peak flow of 40 m³/s. The catchment area is 180 km². The 6-h unit hydrograph of this catchment will have a peak flow in m³/s of

A.
10
B.
20
C.
30
D.
None of these

Solution:

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10 Questions MCQ Test Topicwise Question Bank for GATE Civil Engineering | Hydrographs - 1

The recession limb of a flood hydrograph can be expressed with positive values of coefficients, as Q_t/Q₀ =