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Irrigation Systems

Comprehensive, high-yield study notes, mnemonics, tables, and concept breakdown for Allahabad High Court RO/ARO preparation.

Core Concepts: Irrigation Systems - Fundamentals

  • Irrigation: Artificial application of water to land to assist in the production of crops. Essential for areas with insufficient rainfall or for high-yield varieties.
  • Objectives: Ensure timely water supply, protect crops from drought, cool soil, leach salts, soften tillage pans.
  • Types of Irrigation Systems:
    • Surface Irrigation: Water flows over the land surface (e.g., Flood, Furrow, Basin).
    • Subsurface Irrigation: Water applied below the ground surface directly to the root zone.
    • Sprinkler Irrigation: Water sprayed into the air and falls like rain (e.g., Rotary, Perforated Pipe).
    • Drip/Trickle Irrigation: Water delivered slowly and directly to the plant roots through emitters.
High-Yield Fact: India has the largest irrigated area in the world, crucial for food security and agricultural productivity, especially for crops like rice, wheat, and sugarcane.

Surface Irrigation Methods & Comparison

  • Flood Irrigation (Wild Flooding): Simplest, least efficient. Water covers the entire field.
  • Basin Irrigation: Small, level plots enclosed by dikes. Suitable for orchards, rice.
  • Furrow Irrigation: Water flows in small channels (furrows) between crop rows. Suitable for row crops (e.g., maize, potatoes).
  • Border Strip Irrigation: Field divided into long parallel strips separated by low levees. Water flows down the strip.
Method Water Use Efficiency Suitability Initial Cost
Flood Low (30-50%) Level fields, close-growing crops Very Low
Basin Moderate (50-60%) Level fields, rice, orchards Low
Furrow Moderate (50-70%) Sloping fields, row crops Moderate
Border Strip Moderate (50-70%) Uniform slopes, close-growing crops Moderate
Memory Aid: "FBBF" for Surface Irrigation Types: Flood, Basin, Border Strip, Furrow.

Modern Irrigation Systems (Micro-Irrigation)

  • Sprinkler Irrigation:
    • Water applied as artificial rain. High pressure required.
    • Types: Rotary (impact sprinklers), Perforated Pipe.
    • Advantages: Suitable for undulating terrain, sandy soils, water conservation.
  • Drip/Trickle Irrigation:
    • Water delivered directly to the root zone through emitters/drippers.
    • Components: Pump, filters, mainlines, sub-mainlines, laterals, emitters.
    • Advantages: Highest water use efficiency (90-95%), minimizes evaporation, reduces weed growth, suitable for high-value crops.
High-Yield Fact: Drip irrigation has the highest water use efficiency, followed by sprinkler, then surface irrigation. This is key for "Per Drop More Crop" initiative.
Landmark Fact: Pradhan Mantri Krishi Sinchayee Yojana (PMKSY) launched in 2015, aims to expand irrigated area ("Har Khet Ko Pani") and improve water use efficiency ("Per Drop More Crop") through micro-irrigation.

Irrigation Sources & Challenges in India

  • Major Sources:
    • Canals: Gravity-fed, often from rivers/reservoirs. Important in Northern Plains.
    • Wells & Tube-wells: Extract groundwater. Dominant source, especially in Punjab, Haryana, UP, Rajasthan.
    • Tanks: Small reservoirs, often rain-fed. Important in Peninsular India (e.g., Tamil Nadu, Andhra Pradesh).
  • Other Sources: Ponds, check dams, lift irrigation.
Source Approx. Contribution to Irrigated Area (India) Key Regions
Wells & Tube-wells ~60-65% Punjab, Haryana, Uttar Pradesh, Rajasthan, Gujarat
Canals ~25-30% Uttar Pradesh, Punjab, Haryana, Andhra Pradesh
Tanks ~3-5% Tamil Nadu, Andhra Pradesh, Karnataka
Exam Tip: Wells and tube-wells are the largest source of irrigation in India, but their over-extraction leads to groundwater depletion.
Challenges: Waterlogging, soil salinity, groundwater depletion, inter-state water disputes, low irrigation efficiency, lack of maintenance.

Irrigation Efficiency & Management

  • Water Use Efficiency (WUE): Ratio of crop yield to the amount of water consumed. Higher WUE means more output per unit of water.
  • Irrigation Intensity: Percentage of the cultivable command area that is irrigated in a year.
    • Formula: Irrigation Intensity = (Gross Irrigated Area / Cultivable Command Area) * 100
  • Command Area Development (CAD) Programme: Aims to optimize water use and agricultural production in areas commanded by irrigation projects. Focuses on on-farm development works, field channels, and farmer training.
  • Conjunctive Use of Water: Integrated use of surface and groundwater resources to optimize water availability and prevent waterlogging/salinity.
High-Yield Fact: Improving irrigation efficiency is crucial for sustainable agriculture, especially in water-stressed regions. Micro-irrigation plays a vital role.
Memory Aid: "CAD" for Command Area Development – think of it as "Commanding A-grade Development" for irrigation projects.

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📌 Focus on foundational definitions, statutory provisions, and landmark dates related to Irrigation Systems.
📌 Compare key differences and table classifications to eliminate incorrect options in preliminary MCQs.
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