GeographyCBSE Class 12 · Planning and Sustainable Development in Indian Context

Indira Gandhi Canal (Nahar) Command Area (Class 12 Geography, India: People and Economy, Chapter 6)

Updated 16 October 2026 · Fact-checked

The Indira Gandhi Canal, once the Rajasthan Canal, starts at Harike barrage in Punjab and runs through the Thar Desert, with a planned length of 9,060 km for a culturable command area of 19.63 lakh hectares. Irrigation greened the land and changed crops, but also caused waterlogging and soil salinity, so NCERT proposes seven measures, five of them ecological.

Understand Indira Gandhi Canal (Nahar) Command Area

Why this topic matters. The syllabus names the Indira Gandhi Canal (Nahar) Command Area as case study 2 of Chapter 6. CBSE has used it for source-based items and for a 5-mark question on measures for ecological balance. There is no map item for this chapter (the syllabus lists Nil), but know the stages, the two kinds of canal, the gains, the twin problems and all seven measures.

1. The project.

Previously the Rajasthan Canal; one of the largest canal systems in India.
Conceived by Kanwar Sain in 1948; launched on 31 March 1958.
Originates at Harike barrage in Punjab; runs parallel to the Pakistan border at an average distance of 40 km in the Thar Desert (Marusthali) of Rajasthan.
Planned length 9,060 km; culturable command area 19.63 lakh hectares. About 70 per cent was planned for flow irrigation and the rest for lift irrigation.
Lift canal: water is lifted to flow against the slope of the land. All lift canals originate on the left bank of the main canal; canals on the right bank are flow channels.

2. Two stages.

Stage I: Ganganagar, Hanumangarh and northern Bikaner; gently undulating topography; culturable command area 5.53 lakh ha; irrigation from the early 1960s.
Stage II: Bikaner, Jaisalmer, Barmer, Jodhpur, Nagaur and Churu; culturable command area 14.10 lakh ha; desert dotted with shifting sand dunes and summer temperature soaring to 50 degrees C; irrigation from the mid-1980s.
Intended use: protective irrigation in Stage I and extensive irrigation of crops and pasture development in Stage II.

3. Effects.

Positive environmental effects: longer availability of soil moisture and afforestation and pasture development under the Command Area Development (CAD) programme have greened the land; wind erosion and siltation of canal systems have been reduced.
Economic effects: soil moisture had been a limiting factor; cultivated area and cropping intensity rose; gram, bajra and jowar were replaced by wheat, cotton, groundnut and rice; agricultural and livestock productivity at first rose tremendously.
Negative effects: intensive irrigation and excessive use of water produced the twin problems of waterlogging and soil salinity, which in the long run hamper the sustainability of agriculture. NCERT says scholars questioned the project's ecological sustainability and that the last four decades of development degraded the physical environment.

4. Seven measures for sustainable development. Five of the seven restore ecological balance.

(i) Strict implementation of the water management policy.
(ii) A cropping pattern without water-intensive crops; encourage plantation crops such as citrus fruits.
(iii) CAD works: lining of water courses, land development and levelling, and the warabandi system (equal distribution of canal water in the command area of an outlet), to cut conveyance loss.
(iv) Reclaim waterlogged and saline areas.
(v) Eco-development: afforestation, shelterbelt plantation and pasture development, especially in fragile Stage II.
(vi) Social sustainability: adequate financial and institutional support for land allottees from poor economic backgrounds.
(vii) Economic sustainability: diversify beyond agriculture and animal husbandry and build functional linkages among basic villages, agro-service centres and market centres.

Inference (ours, not NCERT). NCERT says five of the seven are ecological and labels (vi) social and (vii) economic, so the other five, (i) to (v), are the ecological ones by elimination. NCERT does not name rice as a water-intensive crop; classing it so is our inference.

Key quotations

Short lines worth knowing by heart: who says them, when, and why they matter.

Soil moisture has been a limiting factor in successful growing of crops in this area.
NCERT, India: People and Economy, Chapter 6: Case study, Indira Gandhi Canal (Nahar) Command Area.
Explains why canal water changed crops and incomes so sharply.

Indira Gandhi Canal (Nahar) Command Area: key facts

Project facts: Conceived 1948 (Kanwar Sain)
launched 31 March 1958
starts at Harike barrage, Punjab
40 km from the Pakistan border on average
9,060 km planned
19.63 lakh ha command area; Earlier called the Rajasthan Canal.
Stages: Stage I: Ganganagar, Hanumangarh, north Bikaner
5.53 lakh ha
early 1960s || Stage II: Bikaner, Jaisalmer, Barmer, Jodhpur, Nagaur, Churu
14.10 lakh ha
mid-1980s; 5.53 + 14.10 = 19.63 lakh ha.
Canal types: $A b o u t 70 p er ce n t f l o w, r es tl i f t ∣ l i f t c ana l ss t a r t o n t h e l e f t bank ∣ r i g h t bank c ana l s a r e f l o w c hann e l s ∣ l i f t = w a t er r ai se d a g ain s tt h es l o p e$; Left = Lift.
Crop change and problems: Gram, bajra, jowar replaced by wheat, cotton, groundnut, rice | twin problems: waterlogging and soil salinity; Productivity rose at first, sustainability is hampered later.

How to answer Indira Gandhi Canal (Nahar) Command Area questions

For this case study, tie every statement to the canal itself: a stage, a canal type, a crop, a problem or a numbered measure. Keep gains and losses in separate lines.

1Start with the facts that fix the project: Harike barrage, Thar Desert, 1958, 9,060 km, 19.63 lakh ha.
2For stages, give the districts, the command area and the year irrigation began for each stage.
3For effects, write the greening and crop change first, then the twin problems of waterlogging and soil salinity.
4For measures, number them (i) to (vii) and say which five are ecological, which one is social and which one is economic.
5Mark any reasoning that goes beyond the text as "our inference".

Indira Gandhi Canal (Nahar) Command Area in real life

The idea, met in an everyday situation. Answer the question in your own words, then compare with the model answer. The one-line hook is what to remember.

Lift irrigation

Suppose a farmer's field lies on ground higher than the nearby canal, so pumps raise the water to reach it, while a neighbour across the canal on lower ground gets water running by itself.

Which two kinds of canal do these resemble in the Indira Gandhi Canal system, and on which bank do the lift canals originate?

Try it first, then show the solutionSolution

In a lift canal the water is lifted to make it flow against the slope of the land.
In a flow channel the water runs down the slope without lifting.
All lift canals originate from the left bank of the main canal; canals on the right bank are flow channels.

Answer: Lift irrigation for the first field and flow irrigation for the second; the lift canals of the system originate on the left bank of the main canal.

Memory hook: Left = Lift.

Eco-development

Imagine a village at the edge of a sandy desert plants lines of trees as shelter belts and grows grass on a protected pasture, so that blown sand no longer buries its fields and channels.

Which measure of the NCERT list does this match, and which two harms does the greening reduce?

Try it first, then show the solutionSolution

Measure (v): eco-development through afforestation, shelterbelt plantation and pasture development, particularly in fragile Stage II.
Afforestation and pasture development under CAD help reduce wind erosion and siltation of canal systems.

Answer: Measure (v), eco-development; the greening reduces wind erosion and the siltation of the canal systems.

Memory hook: Trees and grass hold the sand.

Tricks to remember Indira Gandhi Canal (Nahar) Command Area

Short memory aids. Say each one aloud once, then use it on a question the same day.

Stage II districts "B J B J N C"
Bikaner, Jaisalmer, Barmer, Jodhpur, Nagaur, Churu.
Use it when: Six districts of Stage II.
Stage I is the short list
Three names only: Ganganagar, Hanumangarh and northern Bikaner; the smaller command area (5.53 lakh ha).
Use it when: Do not push Stage II districts into Stage I.
Left = Lift
Lift canals start on the left bank; right-bank canals are flow channels.
Use it when: Canal types.
5 + 1 + 1
Seven measures: five ecological, one social (vi), one economic (vii).
Use it when: Measures for sustainability.

Indira Gandhi Canal (Nahar) Command Area: solved examples

Ordered from board level to HOTS. Try each one before you open the solution.

Example 1: Summer temperature in Stage II · 1 mark · MCQBoard level

The Stage-II command area of the Indira Gandhi Canal is described by NCERT as desert land dotted with shifting sand dunes where summer temperature soars to about:
(A) 35 degrees C
(B) 40 degrees C
(C) 45 degrees C
(D) 50 degrees C

Try it first, then show the solutionSolution

NCERT: Stage II comprises desert land dotted with shifting sand dunes and temperature soaring to 50 degrees C in summers (1 mark).

Answer: (D) 50 degrees C

Example 2: Statements on the project and its stages · 1 mark · MCQHarder board level

Consider the statements about the Indira Gandhi Canal:
I. The command area of Stage I has a gently undulating topography.
II. The canal project was launched in 1948.
III. The project envisages protective irrigation in Stage I and extensive irrigation of crops and pasture development in Stage II.
Which are correct?
(A) I and II
(B) II and III
(C) I and III
(D) I, II and III

Try it first, then show the solutionSolution

I and III are NCERT statements: Stage I has a gently undulating topography, and the canal project envisages protective irrigation in Stage I and extensive irrigation of crops and pasture development in Stage II.
II is wrong: the project was conceived by Kanwar Sain in 1948 but launched on 31 March 1958 (1 mark).

Answer: (C) I and III

Example 3: Assertion and reason on crop change · 1 mark · Assertion-reasonHarder board level

Assertion (A): Gram, bajra and jowar have been replaced by wheat, cotton, groundnut and rice in the Indira Gandhi Canal command area.
Reason (R): Soil moisture was a limiting factor for crops, and canal irrigation removed that limit.
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true but (R) is false.
(D) (A) is false but (R) is true.

Try it first, then show the solutionSolution

NCERT: soil moisture has been a limiting factor, and the replacement of the traditional crops is the result of intensive irrigation.
So the removal of the moisture limit explains the new cropping pattern (1 mark).

Answer: (A) Both (A) and (R) are true and (R) is the correct explanation of (A).

Example 4: Source-based: cropping pattern and water saving · 3 marks · Source-basedHarder board level

Read the passage: "In general, the cropping pattern shall not include water intensive crops. It shall be adhered to and people shall be encouraged to grow plantation crops such as citrus fruits. The CAD programmes such as lining of water courses, land development and levelling and warabandi system (equal distribution of canal water in the command area of outlet) shall be effectively implemented to reduce the conveyance loss of water."
(i) Which kind of crop does the passage ask people to avoid? (1)
(A) Plantation crops (B) Water-intensive crops (C) Citrus fruits (D) Pasture grasses
(ii) Warabandi means: (1)
(A) lifting water to higher land (B) lining the main canal with concrete (C) equal distribution of canal water in the command area of an outlet (D) reclaiming saline land
(iii) The works named in the passage are meant mainly to: (1)
(A) reduce conveyance loss of water (B) increase wind erosion (C) reduce the length of the canal (D) raise soil salinity

Try it first, then show the solutionSolution

(i) Water-intensive crops, so (B) (1 mark).
(ii) Equal distribution of canal water in the command area of an outlet, so (C) (1 mark).
(iii) Reduce the conveyance loss of water, so (A) (1 mark).

Answer: (i) B; (ii) C; (iii) A

Example 5: Flow and lift irrigation · 3 marks · Short answerBoard level

What share of the command area of the Indira Gandhi Canal was envisaged to be irrigated by the flow system, and how does lift irrigation differ from it? Give the bank on which lift canals originate. (3 marks)

Try it first, then show the solutionSolution

About 70 per cent of the command area was envisaged to be irrigated by flow system and the rest by lift system (1 mark).
In a lift canal the water is lifted to make it flow against the slope of the land (1 mark).
All lift canals originate on the left bank of the main canal; canals on the right bank are flow channels (1 mark).

Answer: About 70 per cent of the total command area was planned for flow irrigation and the remaining 30 per cent (our subtraction) for lift irrigation. In a flow system water runs by gravity, while in a lift canal the water is lifted so that it flows against the slope of the land. All the lift canals of the system originate on the left bank of the main canal, and the canals on the right bank are flow channels.

Example 6: HOTS: rice across Stage II? · 5 marks · Long answerHOTS / competency

A planner proposes that the whole of Stage II should grow rice because rice gives a high yield with canal water. Evaluate the proposal using the NCERT case study, and say what the planner should do instead. Label any inference. (5 marks)

Try it first, then show the solutionSolution

Conditions (1 mark): Stage II is desert land with shifting sand dunes and temperatures up to 50 degrees C, a fragile environment.
Evidence against (2 marks): intensive irrigation led to waterlogging and soil salinity, which hamper sustainability in the long run; rice is among the crops that replaced the traditional ones; NCERT says the cropping pattern shall not include water-intensive crops (rice as water-intensive is our inference).
Better plan (2 marks): grow plantation crops such as citrus fruits; follow the water management policy; use lining, levelling and warabandi; reclaim affected land; add afforestation, shelterbelts and pasture.

Answer: The proposal is unsound. Stage II is a fragile desert area with shifting sand dunes and summer temperatures up to 50 degrees C. NCERT records that intensive irrigation and excessive use of water have produced waterlogging and soil salinity, which in the long run hamper the sustainability of agriculture, and that rice is one of the crops that replaced the traditional gram, bajra and jowar. It also states that the cropping pattern shall not include water-intensive crops. NCERT does not name rice as water-intensive; treating it so is our inference.

The planner should instead encourage plantation crops such as citrus fruits, implement the water management policy strictly, reduce conveyance loss through lining of water courses, land levelling and warabandi, reclaim waterlogged and saline areas, and add eco-development through afforestation, shelterbelt plantation and pasture development.

Where students lose marks in Indira Gandhi Canal (Nahar) Command Area

The slips examiners see most often, and what to write instead.

Mistake: Putting Jaisalmer or Churu in Stage I
Both Stage I and Stage II lie in north-western Rajasthan.
Wrong working
Stage I covers Ganganagar, Bikaner and Jaisalmer.
Right working
Stage I: Ganganagar, Hanumangarh and northern Bikaner. Stage II: Bikaner, Jaisalmer, Barmer, Jodhpur, Nagaur and Churu.
Do this: Learn the short Stage I list first.
Usually costs: 1 mark.
Mistake: Reversing the banks for lift and flow canals
Left and right are easy to swap.
Wrong working
Lift canals originate on the right bank.
Right working
All lift canals originate on the left bank; right-bank canals are flow channels.
Do this: Left = Lift.
Usually costs: 1 mark.
Mistake: Dating the project 1948 for launch
The conception and the launch are two different years.
Wrong working
The canal project was launched in 1948.
Right working
It was conceived by Kanwar Sain in 1948 and launched on 31 March 1958.
Do this: Conceived 1948, launched 1958.
Usually costs: 1 mark.
Mistake: Listing only gains in an "assess" answer
Canal irrigation is remembered for greening the desert.
Wrong working
The canal has only improved the ecology and economy.
Right working
Greening and higher productivity came with waterlogging and soil salinity, which hamper long-run sustainability.
Do this: Always add the twin problems.
Usually costs: 1 to 2 marks.

Exam tips

For the 5-mark measures question, number the measures (i) to (vii) and state which five are ecological.
Say "culturable command area" and give both stage figures with their sum, 19.63 lakh ha.
Do not name rice as water-intensive as if NCERT said so; if you use that idea, call it your inference.
The questions on this page are our own and are checked by meaning against the chapter page and past papers; they are not copies of board items.

Practice questions on Indira Gandhi Canal (Nahar) Command Area

Write each answer on paper first. Open the hint only if you are stuck, and the answer only when you have finished.

Q1 · 1 mark · MCQBoard level
Irrigation in the Stage-II command area of the Indira Gandhi Canal began in the:
(A) early 1960s
(B) late 1950s
(C) mid-1980s
(D) early 1990s
Hint
Stage I came first.
Answer
(C) mid-1980s. Stage I received irrigation in the early 1960s.
Q2 · 2 marks · Very short answerHarder board level
The culturable command areas of Stage I and Stage II are 5.53 lakh ha and 14.10 lakh ha. Verify that they add up to the project total and find the percentage share of Stage II, to the nearest whole number. (2 marks)
Hint
The project total is 19.63 lakh ha.
Answer
5.53 + 14.10 = 19.63 lakh ha, which matches the project total. Stage II share = 14.10 / 19.63 x 100 = 71.8, about 72 per cent (our own arithmetic on the NCERT figures).
Q3 · 1 mark · MCQHarder board level
Which one of the following sets contains only districts of the Stage-II command area of the Indira Gandhi Canal?
(A) Jaisalmer, Barmer, Churu
(B) Ganganagar, Jodhpur, Nagaur
(C) Hanumangarh, Churu, Barmer
(D) Jaisalmer, Hanumangarh, Nagaur
Hint
Ganganagar and Hanumangarh are Stage I.
Answer
(A) Jaisalmer, Barmer, Churu. Ganganagar and Hanumangarh belong to Stage I, so sets B, C and D each contain one of them.
Q4 · 3 marks · Short answerHarder board level
NCERT proposes seven measures for sustainable development in the Indira Gandhi Canal command area. Which two are not ecological, what does each ask for, and how many are ecological? (3 marks)
Hint
Social and economic sustainability.
Answer
Five of the seven measures restore ecological balance. The social measure (vi) asks that land allottees with a poor economic background get adequate financial and institutional support for cultivating their land. The economic measure (vii) asks that development should not rest only on agriculture and animal husbandry, but diversify the economic base and build functional linkages between basic villages, agro-service centres and market centres.
Q5 · 3 marks · Short answerBoard level
Describe where the Indira Gandhi Canal starts and the physical setting through which it runs, naming the desert and the average distance from the international border. (3 marks)
Hint
Barrage, border, desert.
Answer
The canal originates at the Harike barrage in Punjab. It runs parallel to the Pakistan border at an average distance of about 40 km in the Thar Desert (Marusthali) of Rajasthan. The command area of Stage I has a gently undulating topography, whereas Stage II is desert land dotted with shifting sand dunes where summer temperatures soar to 50 degrees C.
Q6 · 3 marks · Short answerHOTS / competency
An official proposes: "Give every settler in the command area more canal water and nothing else; economic sustainability will follow." Using NCERT, explain why this is not enough. (3 marks)
Hint
Measure (vii) and the twin problems.
Answer
NCERT says economic sustainability cannot be attained only through development of agriculture and animal husbandry; agriculture and allied activities have to develop along with other sectors, diversifying the economic base and building functional linkages between basic villages, agro-service centres and market centres. More water alone would also worsen the twin problems of waterlogging and soil salinity caused by intensive irrigation and excessive use of water. The proposal therefore ignores both the economic and the ecological limits.

Test your recall

Answer in your head or on paper first, then open the card. Pulling an answer out of memory makes it stick far better than re-reading.

1.At which barrage does the Indira Gandhi Canal originate?Show answer
Harike barrage in Punjab.
2.At what average distance from the Pakistan border does the canal run?Show answer
About 40 km, in the Thar Desert (Marusthali) of Rajasthan.
3.What was the canal called earlier?Show answer
The Rajasthan Canal.
4.Which crops replaced gram, bajra and jowar?Show answer
Wheat, cotton, groundnut and rice.
5.Which twin environmental problems appeared?Show answer
Waterlogging and soil salinity.

Indira Gandhi Canal (Nahar) Command Area: frequently asked questions

How has CBSE tested this case study?

Source-based items on the canal's objective, major benefit and negative impact (2023 64/3/1 Q15 to Q17), a matching item pairing Target Area Planning programmes with areas (2024 64/1/1 Q4), a 1-mark item on the lift-irrigated area (2025 64/7/1 Q4: the area to the left of the main canal), the terminal district of the main canal (2026 64/2/2 Q8), 5-mark questions on measures for sustainable development or ecological balance (2023 64/1/3 Q24; 2024 64/3/1 Q27; 2026 64/5/1 Q28(a)), on the benefits of the canal (2026 64/4/1 Q27(a)) and on its role in changing the ecology, economy and society of the Thar (sample paper 2026-27 Q28). The measures and the stage facts on this page cover these.

Which district does the main canal end in?

NCERT's text does not say: it names only the Harike barrage in Punjab as the origin and lists the Stage I and Stage II districts. CBSE asked it in 2026 (64/2/2 Q8, options Bikaner, Barmer, Ganganagar and Jaisalmer), and the marking scheme gives (D) Jaisalmer, citing page 71 of the textbook, where the canal is shown on a figure. Treat Jaisalmer as the marking-scheme answer, not as a sentence from the NCERT text; no question on this page depends on it.

Which are the five ecological measures?

NCERT says five of the seven measures restore ecological balance and labels measure (vi) as social and (vii) as economic sustainability. By elimination the five ecological ones are (i) water management policy, (ii) cropping pattern, (iii) CAD works (lining, levelling, warabandi), (iv) reclamation of waterlogged and saline land, and (v) eco-development. The numbering of the five is our reading of the text.

Is Harike barrage or the canal part of the map list?

No. The 2026-27 syllabus map list shows Nil for Chapter 6, so no marking on the map is required for this case study.

Did NCERT say waterlogging happened in Stage I or Stage II?

No. NCERT says waterlogging and soil salinity emerged in the region because of intensive irrigation and excessive use of water, without naming a stage. Do not assign them to one stage.