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

2010 · Agricultural Engineering · Irrigation and Drainage Engineering · Agricultural Drainage

Agricultural Engineering (AG) 2010

In an irrigation command area, the irrigation interval, gross application in an irrigation and the application efficiency are 20 days, 75 mm and 60%, respectively. The soil is homogeneous with K = 0.9 m day^-1. The impermeable layer is at a depth of 7 m from the ground surface. The area is to be tile drained with tiles at a depth of 2 m below the ground surface. The maximum permissible steady state water table height mid-way between the drains, from the plane of the drain, is 1.2 m. Using the steady state approach of Hooghoudt, assuming an equivalent depth of 4.12 m, the drain spacing in m will be

A

115.25

B

131.75

C

146.25

D

186.35

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8

2011 · Agricultural Engineering · Irrigation and Drainage Engineering · Agricultural Drainage

Agricultural Engineering (AG) 2011

A crop grown over an area of 50 ha can tolerate 5 decisiemens m^-1 of electrical conductivity in the drainage water. The consumptive use of the crop is 1.0 m, 30% of which is obtained from the rainfall and the remainder is met from the irrigation water having electrical conductivity of 2 decisiemens m^-1. For efficient crop production, the leaching requirement and the quantity of water that must be drained from the area are

A

40% and 0.23 Mm³

B

60% and 0.23 Mm³

C

40% and 0.21 Mm³

D

60% and 0.21 Mm³

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9

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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10

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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11

2014 · Agricultural Engineering · Irrigation and Drainage Engineering · Agricultural Drainage

Agricultural Engineering (AG) 2014

A tile drainage system having 200 mm diameter lateral of 400 m length is used to drain an area with a drainage coefficient of 40 mm. Manning’s roughness coefficient for the drain pipe is 0.01. Drain pipes are laid at 0.3% slope. The spacing of the tile drain in m is ________.

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12

2016 · Agricultural Engineering · Irrigation and Drainage Engineering · Agricultural Drainage

Agricultural Engineering (AG) 2016

In a subsurface drainage system, the peak discharge through tile drain under full flow condition is given by
\[ Q = 6.715 \times 10^{-4} S^{0.5} n^{-1} \]
where, \( Q \) = discharge, m³ s⁻¹, \( S \) = drain bed slope and \( n \) = Manning's roughness coefficient.
Size of the drain in mm is __________

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13

2017 · Agricultural Engineering · Irrigation and Drainage Engineering · Agricultural Drainage

Agricultural Engineering (AG) 2017

Modified Hooghoudt’s equation for the computation of drain spacing is applicable to

A

homogeneous soils

B

anisotropic soils

C

heavy clay soils only

D

layered soils

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14

2018 · Agricultural Engineering · Irrigation and Drainage Engineering · Agricultural Drainage

Agricultural Engineering (AG) 2018

One of the key assumptions made by Dupuit-Forchheimer about the flow behavior in the porous medium towards subsurface drains is

A

homogeneous medium

B

isotropic medium

C

horizontal streamlines

D

uniform recharge

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15

2018 · Agricultural Engineering · Irrigation and Drainage Engineering · Agricultural Drainage

Agricultural Engineering (AG) 2018

The depths from the soil surface to subsurface tile drains, impermeable soil layer and the highest water table are measured as 2.8 m, 5.0 m and 0.8 m, respectively. The effective hydraulic head for drainage in meter is

A

0.8

B

2.0

C

2.2

D

4.2

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16

2019 · Agricultural Engineering · Irrigation and Drainage Engineering · Agricultural Drainage

Agricultural Engineering (AG) 2019

In a drainage area of 15 ha, the slope and drainage coefficient are 0.4% and 11 mm/day, respectively. The value of Manning's roughness coefficient is 0.016. The inside diameter (in mm) of the corrugated plastic tubing used for drainage is

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17

2020 · Agricultural Engineering · Irrigation and Drainage Engineering · Agricultural Drainage

Agricultural Engineering (AG) 2020

The drainage coefficient of a watershed of 720 ha area is 1.2 cm. The design discharge of the drain in m³ s⁻¹ is ______________.

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18

2022 · Agricultural Engineering · Irrigation and Drainage Engineering · Agricultural Drainage

Agricultural Engineering (AG) 2022

In a subsurface drainage network, 12 lateral drains each of 100 m long are laid at a spacing of 50 m. These lateral drains are connected to a collector drain. When the water table dropped 50 cm below the soil surface in 4 days, the average discharge at the outlet of the collector drain was found to be 12 L s⁻¹. The average drainable porosity of soil in per cent is _______. [round off to two decimal places]

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19

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)

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