Chapter 4 · MCQ Read Mode

Irrigation, Drainage, and Groundwater Development

The 'duty' of irrigation water is defined as:

The relationship between delta (Δ), base period (B) and duty (D) is given by:

Duty measured at the head of the main canal, compared to duty measured at the field, is:

The 'gross irrigation requirement' (GIR) is obtained from the net irrigation requirement (NIR) by:

'Effective rainfall' for irrigation planning refers to: percolation

Overall (project) irrigation efficiency is computed as:

The 'culturable command area' (CCA) refers to:

Crop water requirement typically peaks during which growth stage?

If irrigation intensity is stated as 120% for a command area, this implies:

Conveyance efficiency accounts primarily for losses due to:

A canal aligned along the watershed/ridge line can irrigate:

Kennedy's theory of canal design is based on the concept of:

In Lacey's theory, the wetted perimeter of a regime channel is related to discharge by:

Compared to Kennedy's theory, Lacey's theory is generally considered:

Lane's weighted creep theory differs from Bligh's creep theory mainly by:

Khosla's method of independent variables is primarily used to determine:

A silt excluder is located:

A silt ejector functions by:

An economic analysis to justify canal lining primarily compares: project life

Energy dissipaters (e.g. a stilling basin) are provided downstream of a weir/barrage primarily to:

The lower (alluvial/deltaic) stage of a river is characterized by:

The primary purpose of a guide bund at a barrage is to:

A launching apron protects a guide bund by:

An 'attracting' spur is one that:

Compared to an impermeable (solid) spur, a permeable spur:

Water logging is primarily caused by:

A key effect of water logging on crops is:

Sub-surface (tile/pipe) drainage systems primarily function by:

The design of a sub-surface drain's spacing depends primarily on:

The 'need of river training' near a barrage/bridge site is chiefly to:

A cross regulator, constructed across the parent/main canal at an off-take, primarily serves to:

The function of a canal escape is to:

A 'free' (non-submerged) pipe outlet's discharge depends on:

A canal fall (drop) structure is provided primarily where:

An aqueduct is the appropriate cross-drainage structure when:

A syphon aqueduct differs from a simple aqueduct in that:

A super-passage is used when:

A 'canal syphon' (syphon super-passage) is adopted when: drainage

A 'level crossing' cross-drainage arrangement is adopted when: aqueduct/super-passage is impractical

The design of a pipe outlet's waterway/size is chiefly governed by:

Participatory Irrigation Management (PIM) primarily involves:

In a typical PIM institutional arrangement, the Water Users' Association (WUA) commonly manages:

Rotational water distribution among farmers (e.g. warabandi-type scheduling) is primarily a tool for:

The check-basin method of irrigation is best suited to:

In the border-strip method, water is applied by:

The furrow method of irrigation is characterized by:

Sprinkler irrigation, compared to surface methods, generally:

Drip (trickle) irrigation achieves the highest application efficiency mainly because: percolation

Selection of an appropriate on-farm irrigation method depends primarily on:

Operation and maintenance (O&M) of an irrigation system typically includes:

A confined (artesian) aquifer is characterized by:

Transmissivity (T) of an aquifer is defined as:

Electrical resistivity and seismic refraction surveys are used in groundwater exploration primarily for:

A pumping test on a completed test well is primarily conducted to determine:

The gravel pack around a tube well screen serves primarily to:

Percussion (cable-tool) drilling is particularly suited to:

A centrifugal pump operates on the principle that:

A submersible pump is particularly advantageous for deep tube wells because it:

A hydraulic ram (hydram) lifts water by: that water much higher

A propeller (axial-flow) pump is best suited to applications requiring: