Irrigation - Water Resources Engineering - Civil Engineering Previous Year Questions

1

2007 · Civil Engineering · Water Resources Engineering · Irrigation

Civil Engineering (CE) 2007

The consumptive use of water for a crop during a particular stage of growth is 2.0 mm/day. The maximum depth of available water in the root zone is 60 mm. Irrigation is required when the amount of available water is 50% of the maximum available water in the root zone. Frequency of irrigation should be

A

10 days

B

15 days

C

20 days

D

25 days

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2

2007 · Civil Engineering · Water Resources Engineering · Irrigation

Civil Engineering (CE) 2007

As per the Lacey’s method for design of alluvial channels, identify the TRUE statement from the following:

A

Wetted perimeter increases with an increase in design discharge.

B

Hydraulic radius increases with an increase in silt factor.

C

Wetted perimeter decreases with an increase in design discharge.

D

Wetted perimeter increases with an increase in silt factor.

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3

2007 · Civil Engineering · Water Resources Engineering · Irrigation

Civil Engineering (CE) 2007

The culturable command area for a distributary channel is 20,000 hectares. Wheat is grown in the entire area and the intensity of irrigation is 50%. The kor period for wheat is 30 days and the kor water depth is 120 mm. The outlet discharge for the distributary should be

A

2.85 m³/s

B

3.21 m³/s

C

4.63 m³/s

D

5.23 m³/s

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4

2014 · Civil Engineering · Water Resources Engineering · Irrigation

Civil Engineering (CE) 2014 [Session 2]

Irrigation water is to be provided to a crop in a field to bring the moisture content of the soil from the existing 18% to the field capacity of the soil at 28%. The effective root zone of the crop is 70 cm. If the densities of the soil and water are 1.3 g/cm³ and 1.0 g/cm³ respectively, the depth of irrigation water (in mm) required for irrigating the crop is __________

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5

2015 · Civil Engineering · Water Resources Engineering · Irrigation

Civil Engineering (CE) 2015 [Session 2]

A field channel has cultivable commanded area of 2000 hectares. The intensities of irrigation for gram and wheat are 30% and 50% respectively. Gram has a kor period of 18 days, kor depth of 12 cm, while wheat has a kor period of 18 days and a kor depth of 15 cm. The discharge (in m³/s) required in the field channel to supply water to the commanded area during the kor period is __________.

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6

2017 · Civil Engineering · Water Resources Engineering · Irrigation

Civil Engineering (CE) 2017 [Session 2]

The culturable command area of a canal is 10,000 ha. The area grows only two crops—rice in the Kharif season and wheat in the Rabi season. The design discharge of the canal is based on the rice requirements, which has an irrigated area of 2500 ha, base period of 150 days and delta of 130 cm. The maximum permissible irrigated area (in ha) for wheat, with a base period of 120 days and delta of 50 cm, is __________

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7

2018 · Civil Engineering · Water Resources Engineering · Irrigation

Civil Engineering (CE) 2018 [Session 2]

The intensity of irrigation for the Kharif season is 50% for an irrigation project with culturable command area of 50,000 hectares. The duty for the Kharif season is 1000 hectare/cumec. Assuming transmission loss of 10%, the required discharge (in cumec, up to two decimal places) at the head of the canal is ______

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8

2019 · Civil Engineering · Water Resources Engineering · Irrigation

Civil Engineering (CE) 2019 [Session 2]

The command area of a canal grows only one crop, i.e., wheat. The base period of wheat is 120 days and its total water requirement, Δ, is 40 cm. If the canal discharge is 2 m³/s, the area, in hectares, rounded off to the nearest integer, which could be irrigated (neglecting all losses) is ______

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9

2020 · Civil Engineering · Water Resources Engineering · Irrigation

Civil Engineering (CE) 2020 [Session 2]

Superpassage is a canal cross-drainage structure in which

A

natural stream water flows with free surface below a canal

B

natural stream water flows under pressure below a canal

C

canal water flows with free surface below a natural stream

D

canal water flows under pressure below a natural stream

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10

2020 · Civil Engineering · Water Resources Engineering · Irrigation

Civil Engineering (CE) 2020 [Session 2]

Crops are grown in a field having soil, which has field capacity of 30% and permanent wilting point of 13%. The effective depth of root zone is 80 cm. Irrigation water is supplied when the average soil moisture drops to 20%. Consider density of the soil as 1500 kg/m³ and density of water as 1000 kg/m³. If the daily consumptive use of water for the crops is 2 mm, the frequency of irrigating the crops (in days), is

A

7

B

10

C

11

D

13

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11

2021 · Civil Engineering · Water Resources Engineering · Irrigation

Civil Engineering (CE) 2021 [Session 2]

A reservoir with a live storage of 300 million cubic metre irrigates 40000 hectares (1 hectare = 10⁴ m²) of a crop with two fillings of the reservoir. If the base period of the crop is 120 days, the duty for this crop (in hectares per cumec, round off to integer) will then be ________

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12

2022 · Civil Engineering · Water Resources Engineering · Irrigation

Civil Engineering (CE) 2022 [Session 2]

In a certain month, the reference crop evapotranspiration at a location is 6 mm/day. If the crop coefficient and soil coefficient are 1.2 and 0.8, respectively, the actual evapotranspiration in mm/day is

A

5.76

B

7.20

C

6.80

D

8.00

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13

2022 · Civil Engineering · Water Resources Engineering · Irrigation

Civil Engineering (CE) 2022 [Session 2]

A pump with an efficiency of 80% is used to draw groundwater from a well for irrigating a flat field of area 108 hectares. The base period and delta for paddy crop on this field are 120 days and 144 cm, respectively. Water application efficiency in the field is 80%. The lowest level of water in the well is 10 m below the ground. The minimum required horse power (h.p.) of the pump is __________. (round off to two decimal places)
(Consider 1 h.p. = 746 W; unit weight of water = 9810 N/m³)

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14

2023 · Civil Engineering · Water Resources Engineering · Irrigation

Civil Engineering (CE) 2023 [Session 2]

Identify the cross-drainage work in the figure.

A

Super passage

B

Aqueduct

C

Siphon aqueduct

D

Level crossing

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15

2008 · Civil Engineering · Water Resources Engineering · Irrigation

Civil Engineering (CE) 2008

A stable channel is to be designed for a discharge of Q m³/s with silt factor f as per Lacey’s method. The mean flow velocity (m/s) in the channel is obtained by

A

(Q f²/140) ^1/6

B

(Q f/140) ^1/3

C

(Q f²/140) ^1/6

D

0.48 (Q f / f) ^1/3

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16

2008 · Civil Engineering · Water Resources Engineering · Irrigation

Civil Engineering (CE) 2008

An outlet irrigates an area of 20 ha. The discharge (l/s) required at this outlet to meet the evapotranspiration requirement of 20 mm occurring uniformly in 20 days neglecting other field losses is

A

2.52

B

2.31

C

2.01

D

1.52

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17

2009 · Civil Engineering · Water Resources Engineering · Irrigation

Civil Engineering (CE) 2009

The depth of flow in an alluvial channel is 1.5 m. If critical velocity ratio is 1.1 and Manning's n is 0.018, the critical velocity of the channel as per Kennedy's method is

A

0.713 m/s

B

0.784 m/s

C

0.879 m/s

D

1.108 m/s

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18

2009 · Civil Engineering · Water Resources Engineering · Irrigation

Civil Engineering (CE) 2009

An agricultural land of 437 ha is to be irrigated for a particular crop. The base period of the crop is 90 days and the total depth of water required by the crop is 105 cm. If a rainfall of 15 cm occurs during the base period, the duty of irrigation water is

A

437 ha/cumec

B

486 ha/cumec

C

741 ha/cumec

D

864 ha/cumec

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19

2010 · Civil Engineering · Water Resources Engineering · Irrigation

Civil Engineering (CE) 2010

The capacity of irrigation system required to irrigate crop 'X' in 36 hectares is

A

83 litres/sec

B

67 litres/sec

C

57 litres/sec

D

53 litres/sec

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20

2010 · Civil Engineering · Water Resources Engineering · Irrigation

Civil Engineering (CE) 2010

The area of crop 'Y' that can be irrigated when the available capacity of irrigation system is 40 litres/sec is

A

40 hectares

B

36 hectares

C

30 hectares

D

27 hectares

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