# Test: Hydrographs - 2

## 10 Questions MCQ Test GATE Civil Engineering (CE) 2023 Mock Test Series | Test: Hydrographs - 2

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Attempt Test: Hydrographs - 2 | 10 questions in 30 minutes | Mock test for Civil Engineering (CE) preparation | Free important questions MCQ to study GATE Civil Engineering (CE) 2023 Mock Test Series for Civil Engineering (CE) Exam | Download free PDF with solutions
QUESTION: 1

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

Solution:

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

where a = -In kr
kr is recession constant of value less than unity. Q0 and Qt 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,

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

Solution:
QUESTION: 4

A unit hydrograph has

Solution:
QUESTION: 5

The basic assumptions of the unit-hydrograph theory are

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

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

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

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

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

Solution:

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