GATE CE Irrigation PYQs & Answers

Questions 1–10 of 21. Imported answers require independent review unless marked reviewed.

An irrigation canal is to be designed to deliver 10 cumec to meet the peak demand of 750 hectare of croped area. The estimated canal losses are 50 % of the head discharge. The duty (in hectare/cumec) on capacity of this canal is

Your answerChoose one option.

375

1125

1500

1875

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The Culturable Command Area (CCA) for a canal is 1000 hectares. The base period for a crop in the CCA is 140 days. Watering depth for the crop is 40 cm. The outlet discharge (in m

/s) lies between

Your answerChoose one option.

3 and 4

13 and 14

23 and 24

33 and 34

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Pick one or more CORRECT statement(s) from the choices given below, in the context of upstream and downstream cut-offs provided below the concrete apron of weirs / barrages constructed across alluvial rivers.

Your answerSelect all correct options. You can choose more than one.

Cut-offs are provided to increase the rate of flow over the weir / barrage.

Cut-offs are provided to increase the seepage length and prevent failure due to piping.

The bottom level of cut-offs mainly depends on the scour depth.

Cut-offs are provided to ensure occurrence of hydraulic jump within the stilling basin.

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Lacey’s regime equations, followed in India for making scour calculations while designing hydraulic structures across alluvial channels, are given below. Regarding these equations, which of the following statements is/are true:

where,

is discharge and

is silt factor.

Your answerSelect all correct options. You can choose more than one.

is the depth of scour below the existing riverbed

is the Lacey’s waterway width

is the average grain size diameter of the bed material in centimetres

is the depth of scour below the design flood level

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A symmetrical trapezoidal canal is 100 km long. The bottom width is 10 m and the side slope is 1 Horizontal : 1 Vertical. The average flow depth in the canal is 2.5 m throughout the month of April. The measurement from a Class-A evaporimeter in the vicinity of the canal indicated an average evaporation rate of 0.5 cm/day in April.

The volume of water evaporated from the canal (in m³) in the month of April is close to __________ ×10³ (rounded off to 1 decimal place).

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Identify the cross-drainage work in the figure.

Diagram for Civil Engineering question 20

Your answerChoose one option.

Super passage

Aqueduct

Siphon aqueduct

Level crossing

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A canal supplies water to an area growing wheat over 100 hectares. The duration between the first and last watering is 120 days, and the total depth of water required by the crop is 35 cm. The most intense watering is required over a period of 30 days and requires a total depth of water equal to 12 cm. Assuming precipitation to be negligible and neglecting all losses, the minimum discharge (in m³/s, rounded off to three decimal places) in the canal to satisfy the crop requirement is ____________________.

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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

Your answerChoose one option.

5.76

7.20

6.80

8.00

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During a particular stage of the growth of a crop, the consumptive use of water is 2.8 mm/day. The amount of water available in the soil is 50 % of the maximum depth of available water in the root zone. Consider the maximum root zone depth of the crop as 80 mm and the irrigation efficiency as 70 %.

The interval between irrigation (in days) will be _________. (round off to the nearest integer)

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In the context of cross-drainage structures, the correct statement(s) regarding the relative positions of a natural drain (stream/river) and an irrigation canal, is/are

Your answerSelect all correct options. You can choose more than one.

In an aqueduct, natural drain water goes under the irrigation canal, whereas in a super-passage, natural drain water goes over the irrigation canal.

In a level crossing, natural drain water goes through the irrigation canal.

In an aqueduct, natural drain water goes over the irrigation canal, whereas in a super-passage, natural drain water goes under the irrigation canal.

In a canal syphon, natural drain water goes through the irrigation canal.

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GATE CE Irrigation PYQs

How to practice Irrigation

Question 17

Question 19

Question 25

Question 43

Question 61

Question 20

Question 33

Question 20

Question 34

Question 47