Rainfall alone cannot support Indian agriculture year-round. This article covers how irrigation systems fill that gap.
MCQ QuestionsIndian Economy
Irrigation Systems in India
Rainfall alone can’t carry farming year-round — three main ways to fill the gap
Canal
Northern plains
Draws from rivers or reservoirs through built channels
Needs large shared infrastructure and coordination
Well & Tube-well
Growing fast, nationwide
Draws directly from underground water resources
More individual control, but risks depleting the water table
Tank
Tamil Nadu, Andhra Pradesh
Stores rainwater in small reservoirs for later use
Historically vital in the south; many now in disrepair
✊ Must Know
1. Three project size classes
- Major Irrigation projects in India are classified by size, into three tiers. Major projects cover more than 10,000 hectares of culturable command area.
- Medium Medium projects cover 2,000 to 10,000 hectares.
- Minor Minor projects cover under 2,000 hectares.
2. The three main sources of irrigation
- Sources The main sources of irrigation are canals, wells (including tube wells), and tanks. Each source suits a different terrain and water availability.
- Canals Canal irrigation draws water from rivers or reservoirs through built channels. It is common across the fertile plains of northern India.
- Wells Well and tube-well irrigation draws directly from underground water resources. It has grown rapidly, since it gives individual farmers more direct control than shared canal systems.
📘 Good to Know
1. Tank irrigation, south India’s older system
- How it works Tank irrigation stores rainwater in small reservoirs for later use.
- Where It has been historically important in southern India, especially Tamil Nadu and Andhra Pradesh. Many tanks have since fallen into disrepair.
2. Multi-purpose river valley projects
- Definition Multi-purpose river valley projects, like the Bhakra Nangal and Damodar Valley projects, combine irrigation with other goals.
- Other goals These include hydroelectric power generation, flood control, and drinking water supply, all from the same dam and reservoir system.
3. Groundwater recharge and over-extraction
- Recharge India’s underground water resources are recharged naturally by rainfall.
- Risk Heavy tube-well extraction in some regions now draws water faster than natural recharge can replace it.
4. Trade-offs between sources
- Canals The choice of irrigation source involves real trade-offs. Canals need large shared infrastructure and coordination.
- Wells Wells give individual control, but risk depleting the shared underground water table.
5. Three named reservoirs asked together in UPSC
- Aliyar The Aliyar Reservoir sits in Coimbatore district, Tamil Nadu. It is a key part of the Parambikulam Aliyar Project, a multi-river irrigation scheme.
- Isapur The Isapur Reservoir, also called the Upper Painganga Dam, sits on the Penganga river in Maharashtra. It irrigates over 1.3 lakh hectares across the Marathwada and Vidarbha regions.
- Kangsabati The Kangsabati Reservoir, held back by the Mukutmanipur Dam, sits in Bankura district, West Bengal. It irrigates farmland across Bankura, Paschim Medinipur, and Hooghly districts.
- Common thread All three places are named for their water reservoirs, not for any other feature. See the Previous Year Questions section below for the exact UPSC question this fact comes from.
Test Yourself
🌟 Great to Know
1. “Temples of modern India”
- Nehru’s phrase Multi-purpose river valley projects were heavily promoted in the early planning era. Jawaharlal Nehru sometimes called them “temples of modern India.”
- Why it mattered This phrase reflected the symbolic weight placed on large infrastructure, as a marker of national development.
2. Private infrastructure grows faster than shared infrastructure
- Pattern The shift toward tube-well irrigation, over canal irrigation, reflects a broader pattern in many regions.
- Why Individual, privately controlled infrastructure often expands faster than shared public infrastructure. This holds true even when the shared option might be more sustainable long-term.
3. Groundwater over-reliance is now a policy concern
- Risk India’s over-reliance on groundwater irrigation, in some regions, is now considered a genuine long-term resource risk.
- Response This has prompted policy attention toward reviving traditional tank systems. It has also encouraged more water-efficient irrigation methods, like drip and sprinkler systems.
4. Related reading
- Related For India’s tallest and longest named dams, and the reservoirs they create, see GK0022 — Dams of India.
Previous Year Questions
UPSC CSP 2019, GS Paper I, Q42: “What is common to the places known as Aliyar, Isapur and Kangsabati?” The options offered uranium deposits, tropical rain forests, underground cave systems, and water reservoirs. The correct answer is water reservoirs — Aliyar in Tamil Nadu, Isapur in Maharashtra, and Kangsabati in West Bengal are all named for the reservoirs at those sites. Full question and answer: UPSC CSP 2019 — General Studies Paper I, Q42.
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