GATE ES Surface Water Resources PYQs & Answers

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 1–10 of 12. Imported answers require independent review unless marked reviewed.

Topic practice 12 questionsPage 1 of 2

A 6-hour rainfall of 6 cm at a station was found to have a return period of 40 years. The probability that a 6-hour rainfall of this or larger magnitude will occur at least once in 20 successive years at that station is ______ (rounded off to three decimal places).

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The mass curve of a rainfall event of 100 min duration over a catchment is given in the table.

If the initial loss is 0.6 cm and

-index is 0.6 cm/hour, the total surface runoff from the catchment is _____ cm (rounded off to one decimal place).

Time from start of rainfall (min)	0	20	40	60	80	100
Cumulative rainfall (cm)	0	0.5	1.2	2.6	3.3	3.5

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For flood routing, consider the following statements

P: Hydrologic routing method uses continuity equation and momentum equation

Q: Hydraulic routing method uses continuity equation and energy equation

Choose the correct option from the following

Your answerChoose one option.

P is TRUE; Q is TRUE

P is TRUE; Q is FALSE

P is FALSE; Q is TRUE

P is FALSE; Q is FALSE

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The following figure (not to scale) depicts a rainfall hyetograph for a storm over a catchment.

Diagram for Environmental Science and Engineering question 52

If the storm produced a direct runoff of 12.5 mm, then the

-index of the storm for the catchment is ________________ mm/hour. (rounded off to two decimal places)

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The following table and figure (not to scale) show characteristics of a catchment

Diagram for Environmental Science and Engineering question 53

Sub-catchment	Area (ha)	Runoff coefficient	Time of concentration
P	750	0.5	1 hour
Q	1000	0.6	2 hour
R	1500	0.6	3 hour
S	2000	0.7	4 hour

The hyetograph resulting from a storm that occurred uniformly over the catchment, is as follows

Diagram for Environmental Science and Engineering question 53 (figure 2)

Assuming a constant base flow of 40 m³/s, the peak of the runoff hydrograph produced by storm for the catchment at the outlet O is ________________ m³/s. (rounded off to two decimal places)

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A Class-A pan was setup adjacent to a lake for measuring evaporation losses in the lake. The depth of water in the pan at the begining of a certain week was 250 mm. In that week, there was a rainfall event with 10 mm depth. Water depth in the pan at the end of the week was 240 mm. The pan coefficient is 0.8.

The estimated lake evaporation during the week was ______ mm (an integer value).

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Consider a watershed and isohyets as shown in the figure. The average rainfall in the watershed is ______ mm (an integer value).

Diagram for Environmental Science and Engineering question 55

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An S-hydrograph was prepared for a catchment of 240 km² using 3-hour unit hydrograph (1 cm rainfall excess). The equilibrium discharge for the S-hydrograph would be __________ (in m³/s, rounded off to two decimal places).

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The following figure (not to the scale) shows a catchment (Q, S, U, T, Q) and adjoining raingauge stations P, Q, R, S, U and V. Due to a storm, 20 mm, 25 mm, 30 mm, 15 mm, 22 mm and 18 mm rainfall depths were recorded by raingauges at P, Q, R, S, U and V, respectively.

The corresponding mean rainfall over the catchment using Thiessen polygon method is __________ (in mm, rounded off to two decimal places).

Diagram for Environmental Science and Engineering question 51

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Consider the following statements

Statement 1: Goodrich method for reservoir routing is based on hydrologic flood routing method.

Statement 2: Muskingum method for channel routing is based on hydraulic flood routing method.

Which one of the following is correct?

Your answerChoose one option.

Statement 1 is false; Statement 2 is false

Statement 1 is true; Statement 2 is false

Statement 1 is true; Statement 2 is true

Statement 1 is false; Statement 2 is true

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GATE ES Surface Water Resources PYQs

How to practice Surface Water Resources

Question 34

Question 56

Question 16

Question 52

Question 53

Question 35

Question 55

Question 34

Question 51

Question 18