Civil Engineering
GATE CE concept:unit-hydrographs PYQs
Build your understanding with focused practice from past exam papers.
How to practice concept:unit-hydrographs
Attempt a question, record the concept and assumptions, then check the available answer. Rework mistakes after revising the relevant concepts. Topic tags can overlap; review the question context.
Questions 1–9 of 9. Imported answers require independent review unless marked reviewed.
Question 20
Open questionCEMCQ1 markNeeds review
To derive the total flood hydrograph at a catchment outlet from an isolated storm, the order in which the following methods are applied, from the first method to the last method, is
P. Obtaining the hyetograph
Q. Addition of baseflow
R. Estimation of initial and infiltration losses
S. Application of unit hydrograph
Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 59
Open questionCENAT2 marksNeeds review
The peak of flood hydrograph due to a 3-hour duration storm in a catchment is 180 m
/s. The total rainfall depth is 6.6 cm. It can be assumed that the average infiltration loss is 0.2 cm/h. There are no other losses. The base flow is constant at a value of 30 m
/s.The peak value of the 3-hour unit hydrograph for this catchment (in m
/s) is ______ (round off to the nearest integer).Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 56
Open questionce-1NAT2 marksNeeds review
The ordinates of a 1-hour unit hydrograph (UH) are given below.
Time (hours) | 0 | 1 | 2 | 3 | 4 | 5 |
|---|---|---|---|---|---|---|
Ordinates of 1-hour UH (m /s) | 0 | 13 | 50 | 80 | 95 | 85 |
Time (hours) | 6 | 7 | 8 | 9 | 10 | 11 |
|---|---|---|---|---|---|---|
Ordinates of 1-hour UH (m /s) | 55 | 35 | 15 | 10 | 3 | 0 |
These ordinates are used to derive a 3-hour UH. The peak discharge (in m
/s) for the derived 3-hour UH is ______________ (rounded off to the nearest integer).Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 34
Open questionCENAT1 markNeeds review
The ordinates of a one-hour unit hydrograph for a catchment are given below:
| t (hour) | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Q (m³/s) | 0 | 9 | 21 | 18 | 12 | 5 | 2 | 0 |
Use the principle of superposition, a D-hour unit hydrograph for the catchment was derived from this one-hour unit hydrograph. The ordinates of the D-hour unit hydrograph were obtained as 3 m³/s at t = 1 hour and 10 m³/s at t = 2 hour. The value of D (in integer) is _________________________.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 56
Open questionCENAT2 marksNeeds review
A two-hour duration storm event with uniform excess rainfall of 3 cm occurred on a watershed. The ordinates of streamflow hydrograph resulting from this event are given in the table.
Time (hours) | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
|---|---|---|---|---|---|---|---|---|
Streamflow (m³/s) | 10 | 16 | 34 | 40 | 31 | 25 | 16 | 10 |
Considering a constant baseflow of 10 m³/s, the peak flow ordinate (in m³/s) of one-hour unit hydrograph for the watershed is ________ . (in integer)
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Open questionCENAT1 markNeeds review
A 12-hour unit hydrograph (of 1 cm excess rainfall) of a catchment is of a triangular shape with a base width of 144 hour and a peak discharge of 23 m
/s. The area of the catchment (in km
, round off to the nearest integer) isLog in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 50
Open questionCENAT2 marksNeeds review
The ordinates,
, of a 2-hour unit hydrograph (i.e., for 1 cm of effective rain), for a catchment are shown in the table. (hour) | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
( ) | 0 | 2 | 8 | 18 | 32 | 45 | 30 | 19 | 12 | 7 | 3 | 1 | 0 |
A 6-hour storm occurs over the catchment such that the effective rainfall intensity is 1 cm/hour for the first two hours, zero for the next two hours, and 0.5 cm/hour for the last two hours. If the base flow is constant at 5
, the peak flow due to this storm (in
, round off to 1 decimal place) will be ________Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 24
Open questionCENAT1 markNeeds review
The ordinates of a 2-hour unit hydrograph for a catchment are given as:
Time (h) | 0 | 1 | 2 | 3 | 4 |
|---|---|---|---|---|---|
Ordinate (m³/s) | 0 | 5 | 12 | 25 | 41 |
The ordinate (in m³/s) of a 4-hour unit hydrograph for this catchment at the time of 3 h would be ________.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 51
Open questionCENAT2 marksNeeds review
An effective rainfall of 2-hour duration produced a flood hydrograph peak of 200 m³/s. The flood hydrograph has a base flow of 20 m³/s. If the spatial average rainfall in the watershed for the duration of storm is 2 cm and the average loss rate is 0.4 cm/hour, the peak of 2-hour unit hydrograph (in m³/s-cm, up to one decimal place) is ______.
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