Hydrology - Soil and Water Conservation Engineering - Agricultural Engineering Previous Year Questions

1

2007 · Agricultural Engineering · Soil and Water Conservation Engineering · Hydrology

Agricultural Engineering (AG) 2007

For station X, the maximum one day rainfall with 25 years return period is 100 mm. The probability of a one day rainfall equal to or greater than 100 mm at station X occurring at least once in 15 successive years is

A

0.458

B

0.500

C

0.637

D

0.990

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2

2007 · Agricultural Engineering · Soil and Water Conservation Engineering · Hydrology

Agricultural Engineering (AG) 2007

The areas within the contour lines at the site of a proposed reservoir and dam are as follows:

A

21110 m\(^3\)

B

32220 m\(^3\)

C

42220 m\(^3\)

D

59340 m\(^3\)

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3

2007 · Agricultural Engineering · Soil and Water Conservation Engineering · Hydrology

Agricultural Engineering (AG) 2007

The maximum rainfall with a return period of 25 years is given below for a watershed having a time of concentration of 47.65 minutes:

Time (min)	10	20	30	40	60
Rainfall depth (mm)	52.50	55.00	57.50	60.00	65.00

In this watershed, 2.0 km² area has cultivated sandy soil (C = 0.2) and the remaining 3.0 km² has cultivated clay soil (C = 0.7). The peak rate of runoff from the watershed is

A

4.29 m³ s⁻¹

B

5.41 m³ s⁻¹

C

42.99 m³ s⁻¹

D

54.13 m³ s⁻¹

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4

2007 · Agricultural Engineering · Soil and Water Conservation Engineering · Hydrology

Agricultural Engineering (AG) 2007

Equilibrium discharge and its time of occurrence for the derived S-hydrograph are

A

150 m³ s⁻¹ and 16 h

B

380 m³ s⁻¹ and 16 h

C

699 m³ s⁻¹ and 40 h

D

699 m³ s⁻¹ and 44 h

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5

2008 · Agricultural Engineering · Soil and Water Conservation Engineering · Hydrology

Agricultural Engineering (AG) 2008

Three catchments A, M and F each having an area of 10,000 km² are situated in an arid zone, mountainous region of a temperate zone and flat region of a temperate zone respectively. The desirable number of hydrometeorological stations for these three catchments, N_A, N_M and N_F respectively will be such that

A

\(N_A > N_F > N_M\)

B

\(N_A < N_M < N_F\)

C

\(N_A > N_M > N_F\)

D

\(N_M = N_F\) and \(N_M > N_A\)

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6

2008 · Agricultural Engineering · Soil and Water Conservation Engineering · Hydrology

Agricultural Engineering (AG) 2008

The analysis of maximum one-day rainfall in a city indicated that a depth of 280 mm has a return period of 50 years. The probability of a one-day rainfall depth equal to or greater than 280 mm in the city occurring two times in 15 successive years is

A

0.032

B

0.323

C

0.042

D

0.272

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7

2008 · Agricultural Engineering · Soil and Water Conservation Engineering · Hydrology

Agricultural Engineering (AG) 2008

A catchment with an area of 756 km² has a 6 h unit hydrograph which is triangular with a base of 70 h. The peak discharge of direct runoff hydrograph due to 5 cm of rainfall excess in 6 h from the catchment is

A

60 m³ s⁻¹

B

535 m³ s⁻¹

C

300 m³ s⁻¹

D

756 m³ s⁻¹

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8

2008 · Agricultural Engineering · Soil and Water Conservation Engineering · Hydrology

Agricultural Engineering (AG) 2008

A 50 g L⁻¹ solution of a tracer was discharged into a stream at a constant rate of 20 mL s⁻¹. At a downstream section, the tracer was completely mixed and attained an equilibrium concentration of 10 parts per billion. Assuming the background concentration as zero, the stream discharge is

A

100 m³ s⁻¹

B

200 m³ s⁻¹

C

800 m³ s⁻¹

D

1000 m³ s⁻¹

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9

2009 · Agricultural Engineering · Soil and Water Conservation Engineering · Hydrology

Agricultural Engineering (AG) 2009

A 10 ha watershed received 100 mm uniformly distributed rainfall. Land use pattern consists of 25% residential area with soil group C and curve number 82, good meadow condition in 50% of the area with soil group D and curve number 78. There is also good open space condition in 25% of the area with soil group D and curve number 80. Assuming AMC-II condition, the volume of runoff in m3 from the watershed will be

A

4955

B

5705

C

5755

D

6555

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10

2010 · Agricultural Engineering · Soil and Water Conservation Engineering · Hydrology

Agricultural Engineering (AG) 2010

An effective rainfall of 20 mm h^-1 occurs for 2 hours in a catchment. The time of concentration of the catchment is 1.5 hour. The peak of the resulting direct runoff hydrograph, in mm h^-1, is

A

10

B

20

C

30

D

40

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11

2010 · Agricultural Engineering · Soil and Water Conservation Engineering · Hydrology

Agricultural Engineering (AG) 2010

For hydrologic design, the entire runoff hydrograph should be known in case of

A

Drop spillway

B

Chute spillway

C

Drop inlet spillway

D

Ogee spillway

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12

2010 · Agricultural Engineering · Soil and Water Conservation Engineering · Hydrology

Agricultural Engineering (AG) 2010

The peak of 1 – h unit hydrograph for the catchment in m³ s⁻¹ is

A

15

B

20

C

25

D

30

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13

2010 · Agricultural Engineering · Soil and Water Conservation Engineering · Hydrology

Agricultural Engineering (AG) 2010

Assuming the above 1 – h unit hydrograph to be triangular in shape with the time to peak as 1 hour, the peak of the 2 – h unit hydrograph for the catchment in m³ s⁻¹ is

A

13.25

B

18.75

C

21.25

D

26.75

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14

2011 · Agricultural Engineering · Soil and Water Conservation Engineering · Hydrology

Agricultural Engineering (AG) 2011

The wedge storage in a river reach during the passage of a flood wave is

A

positive during rising phase

B

negative during rising phase

C

positive during falling phase

D

constant

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15

2011 · Agricultural Engineering · Soil and Water Conservation Engineering · Hydrology

Agricultural Engineering (AG) 2011

For a catchment with an area of 400 km\(^2\), the equivalent discharge of the S-curve obtained by summation of 4-h unit hydrograph in m\(^3\) s\(^{-1}\) is

A

100

B

139

C

200

D

278

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16

2011 · Agricultural Engineering · Soil and Water Conservation Engineering · Hydrology

Agricultural Engineering (AG) 2011

The following figure presents the hyetograph for a 3-hour storm. The surface runoff for the event is estimated to be 38 mm. The phi - index for the event in mm h^-1 is

A

11.50

B

14.25

C

15.80

D

17.25

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17

2013 · Agricultural Engineering · Soil and Water Conservation Engineering · Hydrology

Agricultural Engineering (AG) 2013

The Rational method is used to estimate

A

runoff volume

B

peak runoff rate

C

runoff depth

D

direct surface runoff

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18

2013 · Agricultural Engineering · Soil and Water Conservation Engineering · Hydrology

Agricultural Engineering (AG) 2013

A 100 ha watershed received rainfall at a rate of \(5 \text{ cm h}^{-1}\) for 2 hours. If the runoff generated by the storm was at the rate of \(1 \text{ m}^3 \text{ s}^{-1}\) for 10 hours, the runoff coefficient for the watershed would be

A

\(3.6 \times 10^{-3}\)

B

\(6.0 \times 10^{-2}\)

C

0.36

D

36

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19

2013 · Agricultural Engineering · Soil and Water Conservation Engineering · Hydrology

Agricultural Engineering (AG) 2013

A watershed, with an area of \(360 \text{ km}^2\), has a triangular shaped 4-h unit hydrograph with a base of 50 hours. The peak discharge of direct runoff hydrograph due to \(3 \text{ cm}\) of rainfall-excess in 4 hours from the watershed in \(\text{m}^3 \text{ s}^{-1}\) is

A

13.33

B

40.00

C

120.00

D

160.00

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20

2014 · Agricultural Engineering · Soil and Water Conservation Engineering · Hydrology

Agricultural Engineering (AG) 2014

A triangular 5-hour unit hydrograph (UH₁) of a catchment area of 400 km² has a peak discharge of 60 m³ s^–1. Another triangular 5-hour unit hydrograph (UH₂) having the same base width as UH₁ has a peak flow of 90 m³ s^–1. The catchment area corresponding to UH₂ in km² is

A

267

B

600

C

750

D

867

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