Agricultural Drainage - Irrigation and Drainage Engineering - Agricultural Engineering Previous Year Questions

1

2007 · Agricultural Engineering · Irrigation and Drainage Engineering · Agricultural Drainage

Agricultural Engineering (AG) 2007

A hydraulically efficient trapezoidal drainage channel has to be designed for draining 400 ha of land with a drainage coefficient of 20 mm. If the recommended side slope and depth are 2:1 and 1.06 m respectively, the bottom width is

A

0.25 m

B

0.50 m

C

0.75 m

D

1.00 m

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2

2007 · Agricultural Engineering · Irrigation and Drainage Engineering · Agricultural Drainage

Agricultural Engineering (AG) 2007

In a sub-surface drainage system, tile drains are laid with a slope of 0.28% to carry a peak discharge of 3 litre s\(^{-1}\) per drain. If the Manning's \(n\) is 0.011, the practical diameter of tile required is

A

50 mm

B

75 mm

C

100 mm

D

150 mm

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3

2008 · Agricultural Engineering · Irrigation and Drainage Engineering · Agricultural Drainage

Agricultural Engineering (AG) 2008

The following data were obtained from an agricultural land requiring a pipe drainage system for groundwater control:
Hydraulic conductivity = 8.3 cm h⁻¹, drainable porosity = 5%, reaction factor = 0.31 per day and equivalent depth to the impermeable layer = 2.8 m.
The drain spacing computed by the Glover-Dumm formula will be

A

60 m

B

190 m

C

50 m

D

6 m

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4

2008 · Agricultural Engineering · Irrigation and Drainage Engineering · Agricultural Drainage

Agricultural Engineering (AG) 2008

A tile drainage system draining 12 ha flows at the design capacity for two days in response to a storm. If the system is designed using a drainage coefficient of 1.25 cm, the amount of water removed from the drainage area during two days is

A

150 m³

B

1500 m³

C

30 m³

D

3000 m³

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5

2009 · Agricultural Engineering · Irrigation and Drainage Engineering · Agricultural Drainage

Agricultural Engineering (AG) 2009

The nature of Hooghoudt’s equation for drain spacing is

A

Parabolic

B

Hyperbolic

C

Elliptic

D

Circular

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6

2009 · Agricultural Engineering · Irrigation and Drainage Engineering · Agricultural Drainage

Agricultural Engineering (AG) 2009

A hydraulically efficient trapezoidal drainage channel with a side slope of 2:1 has been designed in a sandy loam soil for a catchment of 600 ha. Taking a drainage coefficient of 16 mm, the flow velocity in mm s^-1 in the drainage channel with a flow depth of 1 m is

A

427

B

450

C

497

D

527

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7

2013 · Agricultural Engineering · Irrigation and Drainage Engineering · Agricultural Drainage

Agricultural Engineering (AG) 2013

The gridiron pipe drainage system is more economical than the herringbone pipe drainage system because

A

it is adopted in the fields which do not require complete drainage

B

the number of main or sub-main lines is reduced

C

the number of junctions and the double-drained area are reduced

D

it has only main or sub-main lines

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8

2013 · Agricultural Engineering · Irrigation and Drainage Engineering · Agricultural Drainage

Agricultural Engineering (AG) 2013

If the drainable porosity of a command area is 5% and the design rate of drop of the water table is \(0.25 \text{ m day}^{-1}\), the drainage coefficient of the command area in \(\text{mm day}^{-1}\) will be

A

250

B

12.5

C

1.25

D

0.0125

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9

2026 · Agricultural Engineering · Irrigation and Drainage Engineering · Agricultural Drainage

Agricultural Engineering (AG) 2026

A tile drainage system having a drainage coefficient of 25 mm drains an area of 0.2 km². The average discharge from the system (in m³ s⁻¹) is _____. (Rounded off to three decimal places)

Check answer

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